This document discusses WANs and routers. It begins by defining a WAN as a data communications network spanning a large geographic area. It notes that WANs connect devices separated by wide areas and use carriers to establish links between sites. Routers are used in WANs to provide internetworking and WAN interface ports. The document also discusses the internal components of routers, including the CPU, memory, interfaces, and software. It explains that routers connect networks and determine the best path for data to travel.
This document provides an overview of the Open Shortest Path First (OSPF) routing protocol. It defines key OSPF concepts like link state advertisements (LSAs), neighbor and topology tables, designated routers (DRs), flooding, shortest path first (SPF) algorithm, and areas. It also compares OSPF to distance vector protocols, describes OSPF network types and neighbor relationships, and provides examples of basic OSPF configuration.
The document discusses point-to-point interconnect and PCI Express. It provides details on Intel's Quick Path Interconnect which uses a point-to-point architecture with multiple direct connections and a layered protocol. It also discusses the physical, data link and transaction layers of the PCI Express protocol and how packets are processed at each layer to ensure reliable transmission across the PCIe link.
This document provides an overview of Ethernet network fundamentals, including:
- The OSI model layers that Ethernet operates in (physical and data link layers)
- Key components and functions of Ethernet including frames, addressing, and the CSMA/CD media access method
- The evolution of Ethernet from early implementations using coaxial cable to modern switched networks using fiber optics and speeds of 1Gbps+
- How MAC addresses are used to uniquely identify devices on an Ethernet network
This document provides an overview of various networking hardware components, including their functions and how they operate at different layers of the OSI model. It describes network adapters, repeaters, hubs, bridges, switches, routers, and gateways. It covers topics such as installing and configuring network adapters, choosing the right adapter, VLANs, and common routing protocols.
The document discusses direct memory access (DMA) and the 8237 DMA controller chip. It provides the following key points:
1. DMA allows direct transfer of data between memory and I/O devices without processor involvement using HOLD and HLDA signals.
2. The 8237 DMA controller provides memory/I/O control signals and addresses to perform DMA transfers across 4 channels at up to 1.6MB/sec.
3. The 8237 contains registers like the current address and word count registers that control DMA transfers for each channel.
Routers are network devices that connect different networks and direct data packets between them. They work at the network layer and use routing tables and routing protocols to determine the best path for packets to travel. There are different types of routers for different uses, such as broadband routers for homes/small offices, wireless routers, edge routers at the network boundary, and core routers that connect large networks at high speeds. Routers provide advantages like easily sharing an internet connection between devices and adding security, but also have disadvantages like complicated setup processes and adding data overhead.
The document discusses direct memory access (DMA) and DMA-controlled I/O. It describes how DMA allows direct access to memory while temporarily disabling the microprocessor. It also explains how disk and video systems often use DMA transfers. The document focuses on the basic operation of DMA, including the HOLD and HLDA control signals. It provides details on the 8237 DMA controller, including its pin definitions and programming. It explains how the 8237 facilitates high-speed data transfers between memory and I/O devices.
The document discusses several topics related to computer network architecture and protocols. It begins by defining network architecture as a framework for designing, building, and managing communication networks. It describes the OSI 7-layer model and each of its layers. It also discusses the TCP/IP network architecture, IP addressing formats and classes, TCP and UDP protocols, and serial communication modes like simplex, half-duplex and full-duplex.
This document provides an overview of the Open Shortest Path First (OSPF) routing protocol. It defines key OSPF concepts like link state advertisements (LSAs), neighbor and topology tables, designated routers (DRs), flooding, shortest path first (SPF) algorithm, and areas. It also compares OSPF to distance vector protocols, describes OSPF network types and neighbor relationships, and provides examples of basic OSPF configuration.
The document discusses point-to-point interconnect and PCI Express. It provides details on Intel's Quick Path Interconnect which uses a point-to-point architecture with multiple direct connections and a layered protocol. It also discusses the physical, data link and transaction layers of the PCI Express protocol and how packets are processed at each layer to ensure reliable transmission across the PCIe link.
This document provides an overview of Ethernet network fundamentals, including:
- The OSI model layers that Ethernet operates in (physical and data link layers)
- Key components and functions of Ethernet including frames, addressing, and the CSMA/CD media access method
- The evolution of Ethernet from early implementations using coaxial cable to modern switched networks using fiber optics and speeds of 1Gbps+
- How MAC addresses are used to uniquely identify devices on an Ethernet network
This document provides an overview of various networking hardware components, including their functions and how they operate at different layers of the OSI model. It describes network adapters, repeaters, hubs, bridges, switches, routers, and gateways. It covers topics such as installing and configuring network adapters, choosing the right adapter, VLANs, and common routing protocols.
The document discusses direct memory access (DMA) and the 8237 DMA controller chip. It provides the following key points:
1. DMA allows direct transfer of data between memory and I/O devices without processor involvement using HOLD and HLDA signals.
2. The 8237 DMA controller provides memory/I/O control signals and addresses to perform DMA transfers across 4 channels at up to 1.6MB/sec.
3. The 8237 contains registers like the current address and word count registers that control DMA transfers for each channel.
Routers are network devices that connect different networks and direct data packets between them. They work at the network layer and use routing tables and routing protocols to determine the best path for packets to travel. There are different types of routers for different uses, such as broadband routers for homes/small offices, wireless routers, edge routers at the network boundary, and core routers that connect large networks at high speeds. Routers provide advantages like easily sharing an internet connection between devices and adding security, but also have disadvantages like complicated setup processes and adding data overhead.
The document discusses direct memory access (DMA) and DMA-controlled I/O. It describes how DMA allows direct access to memory while temporarily disabling the microprocessor. It also explains how disk and video systems often use DMA transfers. The document focuses on the basic operation of DMA, including the HOLD and HLDA control signals. It provides details on the 8237 DMA controller, including its pin definitions and programming. It explains how the 8237 facilitates high-speed data transfers between memory and I/O devices.
The document discusses several topics related to computer network architecture and protocols. It begins by defining network architecture as a framework for designing, building, and managing communication networks. It describes the OSI 7-layer model and each of its layers. It also discusses the TCP/IP network architecture, IP addressing formats and classes, TCP and UDP protocols, and serial communication modes like simplex, half-duplex and full-duplex.
The document discusses the basic functional blocks of a computer, including the CPU, memory, and input/output subsystems. It describes the CPU as having a control unit and execution unit. Memory is used to store data and programs and comes in volatile and non-volatile forms like RAM and ROM. The document also provides a brief history of computer generations from vacuum tubes to integrated circuits, and describes the Von Neumann architecture. It discusses data representation using fixed-point and floating-point number systems.
This document discusses the key components of a local area network (LAN). It describes common network topologies like star, ring, bus and mesh. It also covers different types of network classifications based on transmission technologies and architecture. The main hardware components of a LAN discussed include network interface cards, hubs, switches, cables and connectors, routers and modems. Important software components mentioned are network operating systems and protocol suites.
The document summarizes Profibus DP (distributed peripheral) and Profibus FMS (Fieldbus message specification). Profibus DP allows multiple masters that each assign slaves, while FMS allows peer-to-peer messaging between masters. Profibus DP uses EIA-485 physical layer and operates at speeds up to 12Mbps for high-speed sensor/actuator data transfer. It provides cyclic and acyclic data services between masters and slaves. Profibus FMS uses the same data link layer as DP and enables messaging between masters.
This document discusses different types of networking devices used to connect local area networks (LANs). It describes hubs, repeaters, bridges, routers, and gateways. Hubs and repeaters operate at the physical layer, bridges operate at the physical and data link layers, and routers and gateways operate at the network layer and above to connect multiple networks and perform protocol conversion. The document provides details on the functions and characteristics of each type of device.
The document discusses computer memory and the memory hierarchy. It begins by describing the main types of memory - volatile primary memory and non-volatile secondary memory. It then discusses the memory hierarchy from fastest to slowest: registers, cache memory, main memory, magnetic disks, and removable media like magnetic tapes. The rest of the document provides more details about each level of the memory hierarchy, including descriptions of different types of main memory like RAM, DRAM, and SRAM. It also includes block diagrams to illustrate how different memory components work.
The document discusses distance vector routing protocols and their characteristics. It explains that distance vector protocols advertise routes as vectors containing the distance and direction to a destination. Periodic full table updates are sent to neighbors on a regular basis. Common distance vector protocols include RIP, IGRP and EIGRP. EIGRP differs in that it sends partial updates only when there are topological changes rather than full periodic updates.
The encoder circuit converts the key press signals from the keyboard switches into a binary code which is placed on the DATAIN lines. The interface also includes a debouncing circuit to filter out noise from the mechanical keyboard switches. When a valid key code is received, the interface asserts the SIN (strobe in) signal. The interface acts as a slave device on the bus - it asserts the slave ready signal in response to the master ready from the processor to indicate it can receive or transmit data.
The document discusses various network media and hardware components. It describes transmission media like twisted pair cable, coaxial cable, and optical fiber cable. It also discusses network interface cards, connectors like RJ-45 and fiber optic connectors, and network devices like repeaters, hubs, switches, and routers.
This document provides information on the communication and networking capabilities of the MasterLogic-200 PLC system. It describes the High Speed Link (HSL) service which allows peer-to-peer networking between PLCs and connections to Profibus and DeviceNet devices. It also details the Fast Ethernet (FEnet) and serial (Snet) communication modules, and their support for protocols like MODBUS and user-defined protocols. The Profibus-DP (Pnet) and DeviceNet (Dnet) modules are also summarized.
Network switches, functions & role in networksIT Tech
A network switch connects multiple computers together on a local area network (LAN) and operates at the data link layer of the OSI model. It receives messages and transmits them only to the intended device, unlike a hub. Switches create separate collision domains to allow connected devices to transfer data simultaneously without interference. They can operate at different layers, with layer 3 switches having additional routing capabilities. Switches establish network connectivity and performance within a LAN.
Dynamic Routing All Algorithms, Working And BasicsHarsh Mehta
This document provides information on computer networks and routing protocols. It discusses advantages and problems of computer networks. It then describes the Enhanced Interior Gateway Routing Protocol (EIGRP) and some of its key features like security, congestion handling, efficiency, and support for IPv4 and IPv6. It also discusses static and dynamic routing, different routing metrics, and compares EIGRP to other routing protocols like RIP, OSPF, and IS-IS.
This document discusses different types of data transfer modes between I/O devices and memory, including programmed I/O, interrupt-driven I/O, and direct memory access (DMA). It explains that DMA allows I/O devices to access memory directly without CPU intervention by using a DMA controller. The basic operations of DMA include the DMA controller gaining control of the system bus, transferring data directly between memory and I/O devices by updating address and count registers, and then relinquishing control back to the CPU. Different DMA transfer techniques like byte stealing, burst, and continuous modes are also covered.
Direct Memory Access (DMA) allows certain hardware subsystems to access main system memory independently of the CPU. DMA controllers temporarily borrow the address, data, and control buses from the microprocessor to transfer data directly between an I/O port and memory locations. This allows fast transfer of data to and from devices while the CPU performs other tasks, improving overall system performance. DMA transfers can occur via block transfers where the DMA controller controls the bus for an extended period, or via cycle stealing where it uses the bus for one transfer then returns control to the CPU.
This document outlines the evolution of Ethernet networking standards from the original Ethernet developed at Xerox PARC to modern Gigabit and 10-Gigabit Ethernet standards. It discusses the IEEE 802.3 working group and standards for various Ethernet technologies including 10BASE-T, 100BASE-TX, 1000BASE-T, and 10GbE. Encoding methods like 4D-PAM5 that have allowed Ethernet speeds to increase over twisted pair cabling are also covered at a high level.
The document discusses direct memory access (DMA) and the Intel 8237 DMA controller. It describes how DMA allows high-speed transfer of data between memory and peripherals by bypassing the CPU. The 8237 controller uses HOLD and HLDA signals to request and gain control of address/data buses from the CPU during transfers. It initializes transfers via registers and decrements the word count register with each word transferred.
Routers forward IP packets between networks using routing. Static and dynamic routes populate a routing table that routers use to determine where to send packets. The routing table contains direct routes to local networks and indirect routes through other routers to remote networks.
This document discusses parallel processing and multiprocessors. It covers various topics related to coupling of processors, interconnection structures, bus structures, memory structures, arbitration methods, and synchronization techniques for parallel systems. Tightly coupled systems use shared memory while loosely coupled systems use message passing. Common interconnection structures include buses, crossbar switches, and hypercube networks. Both static and dynamic arbitration methods are described for shared bus access. Hardware semaphores can provide mutual exclusion for critical sections in shared memory parallel systems.
The document discusses the Intel 8257 DMA controller. It allows hardware subsystems to access main memory independently of the CPU, improving data transfer speeds. The 8257 has 4 channels that can service requests from I/O devices simultaneously. It interfaces between devices and the system bus, controlling direct memory access operations and arbitrating bus access. When an I/O device needs to transfer data, it sends a request to the 8257, which then coordinates the transfer directly between memory and the device without involving the CPU. This allows the CPU to continue processing without waiting for I/O, improving overall system efficiency and performance.
El documento resume la novela "Los soldados lloran de noche" de Ana María Matute. Narra la vida de Marta, una prostituta, y cómo termina refugiándose con Manuel para entregar documentos después de la muerte de su pareja Jeza. A través de los recuerdos de Marta, se explica su difícil infancia y cómo terminó en la prostitución debido a su madre y su amante Raúl. Finalmente, encuentra amor con Jeza antes de que él sea ejecutado, por lo que busca a Manuel para cumplir con la misión de Je
Lena Bushrod is an art teacher currently working part-time at Bishop John T. Walker School in Washington D.C. and Treehouse for Creative Kids in Ashburn, VA. She has a Bachelor's degree in Art and Archaeology from Hood College and an Associate's degree from Northern Virginia Community College. Her experience includes exhibitions of her artwork in 2014 and volunteer work as an AAU basketball coach since 2012.
The document discusses the basic functional blocks of a computer, including the CPU, memory, and input/output subsystems. It describes the CPU as having a control unit and execution unit. Memory is used to store data and programs and comes in volatile and non-volatile forms like RAM and ROM. The document also provides a brief history of computer generations from vacuum tubes to integrated circuits, and describes the Von Neumann architecture. It discusses data representation using fixed-point and floating-point number systems.
This document discusses the key components of a local area network (LAN). It describes common network topologies like star, ring, bus and mesh. It also covers different types of network classifications based on transmission technologies and architecture. The main hardware components of a LAN discussed include network interface cards, hubs, switches, cables and connectors, routers and modems. Important software components mentioned are network operating systems and protocol suites.
The document summarizes Profibus DP (distributed peripheral) and Profibus FMS (Fieldbus message specification). Profibus DP allows multiple masters that each assign slaves, while FMS allows peer-to-peer messaging between masters. Profibus DP uses EIA-485 physical layer and operates at speeds up to 12Mbps for high-speed sensor/actuator data transfer. It provides cyclic and acyclic data services between masters and slaves. Profibus FMS uses the same data link layer as DP and enables messaging between masters.
This document discusses different types of networking devices used to connect local area networks (LANs). It describes hubs, repeaters, bridges, routers, and gateways. Hubs and repeaters operate at the physical layer, bridges operate at the physical and data link layers, and routers and gateways operate at the network layer and above to connect multiple networks and perform protocol conversion. The document provides details on the functions and characteristics of each type of device.
The document discusses computer memory and the memory hierarchy. It begins by describing the main types of memory - volatile primary memory and non-volatile secondary memory. It then discusses the memory hierarchy from fastest to slowest: registers, cache memory, main memory, magnetic disks, and removable media like magnetic tapes. The rest of the document provides more details about each level of the memory hierarchy, including descriptions of different types of main memory like RAM, DRAM, and SRAM. It also includes block diagrams to illustrate how different memory components work.
The document discusses distance vector routing protocols and their characteristics. It explains that distance vector protocols advertise routes as vectors containing the distance and direction to a destination. Periodic full table updates are sent to neighbors on a regular basis. Common distance vector protocols include RIP, IGRP and EIGRP. EIGRP differs in that it sends partial updates only when there are topological changes rather than full periodic updates.
The encoder circuit converts the key press signals from the keyboard switches into a binary code which is placed on the DATAIN lines. The interface also includes a debouncing circuit to filter out noise from the mechanical keyboard switches. When a valid key code is received, the interface asserts the SIN (strobe in) signal. The interface acts as a slave device on the bus - it asserts the slave ready signal in response to the master ready from the processor to indicate it can receive or transmit data.
The document discusses various network media and hardware components. It describes transmission media like twisted pair cable, coaxial cable, and optical fiber cable. It also discusses network interface cards, connectors like RJ-45 and fiber optic connectors, and network devices like repeaters, hubs, switches, and routers.
This document provides information on the communication and networking capabilities of the MasterLogic-200 PLC system. It describes the High Speed Link (HSL) service which allows peer-to-peer networking between PLCs and connections to Profibus and DeviceNet devices. It also details the Fast Ethernet (FEnet) and serial (Snet) communication modules, and their support for protocols like MODBUS and user-defined protocols. The Profibus-DP (Pnet) and DeviceNet (Dnet) modules are also summarized.
Network switches, functions & role in networksIT Tech
A network switch connects multiple computers together on a local area network (LAN) and operates at the data link layer of the OSI model. It receives messages and transmits them only to the intended device, unlike a hub. Switches create separate collision domains to allow connected devices to transfer data simultaneously without interference. They can operate at different layers, with layer 3 switches having additional routing capabilities. Switches establish network connectivity and performance within a LAN.
Dynamic Routing All Algorithms, Working And BasicsHarsh Mehta
This document provides information on computer networks and routing protocols. It discusses advantages and problems of computer networks. It then describes the Enhanced Interior Gateway Routing Protocol (EIGRP) and some of its key features like security, congestion handling, efficiency, and support for IPv4 and IPv6. It also discusses static and dynamic routing, different routing metrics, and compares EIGRP to other routing protocols like RIP, OSPF, and IS-IS.
This document discusses different types of data transfer modes between I/O devices and memory, including programmed I/O, interrupt-driven I/O, and direct memory access (DMA). It explains that DMA allows I/O devices to access memory directly without CPU intervention by using a DMA controller. The basic operations of DMA include the DMA controller gaining control of the system bus, transferring data directly between memory and I/O devices by updating address and count registers, and then relinquishing control back to the CPU. Different DMA transfer techniques like byte stealing, burst, and continuous modes are also covered.
Direct Memory Access (DMA) allows certain hardware subsystems to access main system memory independently of the CPU. DMA controllers temporarily borrow the address, data, and control buses from the microprocessor to transfer data directly between an I/O port and memory locations. This allows fast transfer of data to and from devices while the CPU performs other tasks, improving overall system performance. DMA transfers can occur via block transfers where the DMA controller controls the bus for an extended period, or via cycle stealing where it uses the bus for one transfer then returns control to the CPU.
This document outlines the evolution of Ethernet networking standards from the original Ethernet developed at Xerox PARC to modern Gigabit and 10-Gigabit Ethernet standards. It discusses the IEEE 802.3 working group and standards for various Ethernet technologies including 10BASE-T, 100BASE-TX, 1000BASE-T, and 10GbE. Encoding methods like 4D-PAM5 that have allowed Ethernet speeds to increase over twisted pair cabling are also covered at a high level.
The document discusses direct memory access (DMA) and the Intel 8237 DMA controller. It describes how DMA allows high-speed transfer of data between memory and peripherals by bypassing the CPU. The 8237 controller uses HOLD and HLDA signals to request and gain control of address/data buses from the CPU during transfers. It initializes transfers via registers and decrements the word count register with each word transferred.
Routers forward IP packets between networks using routing. Static and dynamic routes populate a routing table that routers use to determine where to send packets. The routing table contains direct routes to local networks and indirect routes through other routers to remote networks.
This document discusses parallel processing and multiprocessors. It covers various topics related to coupling of processors, interconnection structures, bus structures, memory structures, arbitration methods, and synchronization techniques for parallel systems. Tightly coupled systems use shared memory while loosely coupled systems use message passing. Common interconnection structures include buses, crossbar switches, and hypercube networks. Both static and dynamic arbitration methods are described for shared bus access. Hardware semaphores can provide mutual exclusion for critical sections in shared memory parallel systems.
The document discusses the Intel 8257 DMA controller. It allows hardware subsystems to access main memory independently of the CPU, improving data transfer speeds. The 8257 has 4 channels that can service requests from I/O devices simultaneously. It interfaces between devices and the system bus, controlling direct memory access operations and arbitrating bus access. When an I/O device needs to transfer data, it sends a request to the 8257, which then coordinates the transfer directly between memory and the device without involving the CPU. This allows the CPU to continue processing without waiting for I/O, improving overall system efficiency and performance.
El documento resume la novela "Los soldados lloran de noche" de Ana María Matute. Narra la vida de Marta, una prostituta, y cómo termina refugiándose con Manuel para entregar documentos después de la muerte de su pareja Jeza. A través de los recuerdos de Marta, se explica su difícil infancia y cómo terminó en la prostitución debido a su madre y su amante Raúl. Finalmente, encuentra amor con Jeza antes de que él sea ejecutado, por lo que busca a Manuel para cumplir con la misión de Je
Lena Bushrod is an art teacher currently working part-time at Bishop John T. Walker School in Washington D.C. and Treehouse for Creative Kids in Ashburn, VA. She has a Bachelor's degree in Art and Archaeology from Hood College and an Associate's degree from Northern Virginia Community College. Her experience includes exhibitions of her artwork in 2014 and volunteer work as an AAU basketball coach since 2012.
"Living On a Dollar Day" Photographer Réene C.Byermaditabalnco
At the Mae Tao Clinic in Thailand, a 5-month old child receives treatment for burns suffered when she pulled a hot pot of water onto herself while her parents were farming and her 11-year old sister was watching her. Her father and another child anxiously hope for her recovery. The document goes on to provide portraits and stories of people living on less than $1 per day in countries around the world, including a woman and child in Liberia who survive on begging and laundry while suffering from malaria, and a girl in Bangladesh who works in a brothel.
2015 Buick LaCrosse Information Brochure McKaig Chevrolet Buick, Your East Te...McKaig Chevrolet Buick
http://www.mckaig.net
McKaig Chevrolet Buick is located in the "Heart of East Texas" between Longview and Tyler on US 80 @ E Loop 485 in Gladewater.
We are A Dealer For The People. That means we put our guests first, before everything else. We believe that everyone deserves to drive a nicer, newer car today. Our business is not selling cars. Our business is finding solutions to the everyday problems that keep most people stuck in a car they hate. We're on a mission to change the world by helping people get into the car they want and deserve. My goal is to be a Trusted Advisor in the process.
Este documento describe las redes de computadoras, incluyendo sus características, elementos, tipos y la importancia de las redes. Las redes permiten la comunicación entre usuarios y el intercambio de archivos y recursos. Elementos clave de una red incluyen servidores, estaciones de trabajo, software de red y cableado. Las redes son ahora indispensables en nuestras vidas ya sea para la escuela, el trabajo o el entretenimiento.
Las telecomunicaciones son una infraestructura básica que permite la transmisión y recepción de señales a distancia, como sonidos, imágenes u otra información, a través de medios electromagnéticos. Han sido cruciales para la comunicación militar, política y económica a lo largo de la historia y hoy en día son fundamentales para la globalización y el desarrollo de la sociedad de la información. Las telecomunicaciones nos permiten acortar distancias y mantenernos comunicados con el resto del mundo de forma rápida.
Using Biomass as a replacement for oil not only saves you money and reduces your carbon footprint but it also pays cash back as part of the governments Renewable Heat Incentive (RHI). Attached is some further information for those interested.
Check out our website for more - www.redvanplumbers.co.uk or www.ecogreenbuildings.co.uk.
Comprender las bases teóricas del diseño visual, sus principios y tendencias, para así aplicar estos principios en el diseño de ambientes virtuales educativos
The document discusses the key features and design of a new website. The home page will provide access to sections with information, articles, forums, jobs and advertisements. Users must register and log in to comment or participate, which can be done via social media for ease. Advertisements are strategically placed to grab attention without being intrusive. The contact page gives Go Jamaica's address, phone, email and a form, plus a map with directions.
This document summarizes a study that evaluated the effects of gain-framed (emphasizing positive outcomes of vaccination) and loss-framed (emphasizing negative outcomes of not vaccinating) messages on influenza vaccination rates among minority pregnant women. The study also assessed social and community factors that influence maternal immunization. The study found that neither gain-framed nor loss-framed messages significantly increased vaccination rates. Significant predictors of vaccination included healthcare provider recommendation, using hospital-based prenatal care, and perceived social support for vaccination. The study concludes that promoting vaccination through healthcare providers and social networks can improve rates among minority pregnant women.
The document discusses a student's photography project focused on macro and abstract images around their school and home. They will use their Canon 600D camera, tripod, and SD cards to take close-up photos of plants, animals, and abstract wall patterns. The student finds inspiration from internet photos and wants to recreate interesting macro shots and abstract images that are open to interpretation. They plan to display the finished photos on a large canvas for presentation.
Software companies spend so much effort tracking productivity and velocity. What happens when you focus instead on helping everyone find happiness?
This presentation was given to my team members at WellMatch, and is adapted from an earlier presentation given at DevOps Days Austin 2014.
This document discusses WAN standards organizations, router components, and how to connect various ports on a router. It identifies the ITU-T, ISO, IETF, and EIA as key standards bodies. It describes common router internal components like the CPU, RAM, flash memory, and interfaces. It provides instructions for connecting a PC to the console port using a rollover cable, and connecting WAN interfaces like serial ports.
This document discusses various networking hardware devices and their functions. It describes network adapters, hubs, switches, routers, bridges, and gateways. It explains that network adapters connect devices to the network, hubs repeat signals, switches subdivide networks and support virtual LANs, routers integrate LANs and WANs using different protocols, bridges connect similar LANs, and gateways connect dissimilar networks. It also provides details on various types, features, and protocols associated with these networking hardware devices.
A network connects computers and devices through communication channels to allow sharing of resources and communication between users. It consists of computer hardware and software. Networks can be classified by range (LAN, MAN, WAN, PAN), functional relationship (client-server, peer-to-peer), and topology (bus, star, ring). Routing directs network traffic along paths by maintaining routing tables. Major routing protocols include RIP, OSPF, and EIGRP. Access lists filter network traffic by source/destination IP addresses. The college network case study demonstrates configuring OSPF and RIP routing, and uses access lists to restrict access according to constraints.
The document summarizes the architecture of Juniper Networks routers. It discusses the separation of the control plane and forwarding plane. The control plane builds the routing tables while the forwarding plane is responsible for packet forwarding using specialized ASICs. It also describes the TX Matrix platform with up to 4 T640 routing nodes, each with 16 packet forwarding engines. The nodes are interconnected using a CLOS fabric switch.
Routers forward data packets between networks while switches operate at the data link layer and forward packets within a local area network. Hubs simply broadcast all incoming data to all ports. The document provides answers to common CCNA interview questions about networking fundamentals like IP addressing, routing, switching, protocols and Cisco router components.
The document discusses managing Cisco IOS images and configuring WAN connections. It covers topics such as copying flash images using TFTP, resolving hostnames, password recovery, and configuring encapsulation protocols like HDLC and PPP. Specific configuration examples are provided for setting the CHAP authentication protocol on serial interfaces between two routers.
The document discusses managing Cisco IOS images and configuring WAN connections. It covers topics such as copying flash images using TFTP, resolving hostnames, password recovery, and configuring encapsulation protocols like HDLC and PPP. Specific configuration examples are provided for setting the CHAP authentication protocol on serial interfaces between two routers.
The document discusses managing Cisco IOS images and configuring WAN connections. It covers topics such as copying flash images using TFTP, resolving hostnames, password recovery, and configuring encapsulation protocols like HDLC and PPP. Specific configuration examples are provided for setting the CHAP authentication protocol on serial interfaces between two routers.
The document discusses managing Cisco IOS images and configuring WAN connections. It covers topics such as copying flash images using TFTP, resolving hostnames, password recovery, and configuring encapsulation protocols like HDLC and PPP. Examples are provided for configuring CHAP authentication between two routers connected over a serial link.
This document discusses different types of internetworking devices used to connect local area networks (LANs). It describes hubs, bridges, switches and routers in increasing order of complexity. Hubs simply repeat and broadcast data to all ports, while bridges learn and filter traffic between connected LANs. Switches operate similarly to bridges but provide dedicated connections for each workstation. Routers connect distinct networks like a LAN to the Internet, and make routing decisions based on IP addresses. The document outlines reasons for interconnecting LANs and the functions of various internetworking devices.
This document discusses network architecture and design. It covers component architectures, addressing and routing architectures, network management architecture, performance architecture, and security architecture. Some key points include:
- Component architecture describes how network functions are applied using hardware and software mechanisms.
- Addressing involves applying identifiers to network devices, while routing learns connectivity and forwards packets. Common addressing mechanisms include subnetting, super-netting, dynamic addressing, and private/public addressing.
- Network management architecture provides functions for controlling, planning, and monitoring network resources using mechanisms like monitoring, instrumentation, and configuration.
- Performance architecture allocates network resources to users and applications using mechanisms like quality of service, resource control, service level agreements, and policies.
A router is a networking device that forwards data packets between computer networks. It is connected to at least two networks, commonly two LANs or WANs, or a LAN and its ISP's network. Routers perform traffic directing functions and use routing protocols to determine the best path for data packet delivery on the Internet. There are different types of routers including wired, wireless, edge, core, and virtual routers that serve various functions in private networks and across the public internet.
This document discusses various topics related to WAN technologies including backup and restoration of Cisco IOS images, resolving hostnames, WAN connection types, encapsulation protocols, and an overview of technologies like ISDN, Frame Relay, ATM, and PPP. Specific configuration examples are provided for setting up PPP and CHAP authentication between two routers over a serial interface.
The document discusses a lab experiment on network devices and Packet Tracer. It aims to familiarize students with switches, routers, and the network simulator Packet Tracer. The document provides details on router and switch components and functions, and guides students through building a simple topology in Packet Tracer.
This presentation summarizes the Cisco Certified Network Associate (CCNA) certification and covers networking concepts relevant to the CCNA including networking devices, the OSI model, IP addressing, routing, access lists, network address translation, switches, virtual LANs, WAN connection types, wireless technology, and comparisons of 802.11 wireless standards.
This document provides an overview of computer networks. It discusses network diagrams, classifications of networks by range including LAN, WAN, PAN and MAN. Common network topologies such as bus, star, ring and mesh are described. The OSI and TCP/IP models are explained. Common network devices, switching technologies, and transmission media are defined. Signal types including analog and digital are also summarized.
This document provides an overview of routing concepts, including an introduction to routers and their basic functions. It describes how routers connect different networks and forward packets by using routing tables. It also covers routing protocols, distinguishing between static and dynamic routing as well as distance vector and link state routing algorithms. Key components of routers like the CPU, RAM, and interfaces are also defined.
The document provides an introduction to networking concepts and Cisco technologies. It defines networking and network topology, discusses the OSI model and TCP/IP, and describes common network devices like switches, routers, and firewalls. It also covers IP addressing, routing protocols, and basic router and switch configuration.
1.NggggggggggghhhhhhhhhhS UNIT - 1.pptx.pdfsadoyah492
The document discusses various networking devices and network layer attacks. It begins by defining networking devices that operate at different layers, such as network interface cards, routers, switches, hubs, bridges, and gateways. It then covers different types of network layer attacks like IP spoofing, hijacking, Smurf attacks, wormhole attacks, and others. The document provides details on each attack method, how they are carried out, and their impact on network communication.
2. 2
WANs
A wide-area network (WAN) is a data
communications network spanning a large
geographic area
Major characteristics of WANs:
Connect devices that are separated by wide
geographical areas.
Use the services of carriers such as the Regional Bell
Operating Companies (RBOCs), Sprint, MCI, and VPM
Internet Services, Inc. TSTT, Cable and Wireless (Ja)
to establish the link or connection between sites.
Use serial connections of various types to access
bandwidth over large geographic areas
Operate at the physical layer and the data link layer of
the OSI reference model
4. 4
WANs
The following devices are used in WANs:
Routers provide internetworking and WAN
interface ports.
Switches provide connectivity for voice, data,
and video communication.
Modems include interface voice-grade
services, channel service units/digital service
units (CSU/DSUs) for T1/E1 services, and
Terminal Adapters/Network Termination 1
(TA/NT1s) for ISDN services.
Communication servers concentrate dial-in
and dial-out user communication.
7. 7
WAN Protocols
WAN data link protocols describe how
frames are carried between systems on a
single data link
Protocols are designed to operate
over dedicated point-to-point,
multipoint, and multi-access switched
services such as Frame Relay
9. 9
Routers
Router has the following components:
CPU
Memory
System Bus
Input/Output Interfaces
Routers connect and allow communication
between two networks and determine the best
path for data to travel through the connected
networks
Routers has Internetwork Operating System
software (IOS) to run configuration files
Configuration files contain the instructions and
parameters that control the flow of traffic in and
out of the routers
16. 16
Routers
The main internal components of the
router are:
Random access memory (RAM)
Nonvolatile random-access memory
(NVRAM)
Flash memory
Read-only memory (ROM)
Interfaces
17. 17
Routers
RAM, also called dynamic RAM (DRAM)
Stores routing tables
Holds ARP cache
Holds fast-switching cache
Performs packet buffering (shared RAM)
Maintains packet-hold queues
Provides temporary memory for the
configuration file of the router while the
router is powered on
Loses content when router is powered down
or restarted
18. 18
Routers
NVRAM
Provides storage for the startup
configuration file
Retains content when router is powered
down or restarted
19. 19
Routers
Flash memory
Holds the operating system image (IOS)
Allows software to be updated without
removing and replacing chips on the
processor
Retains content when router is powered
down or restarted
Can store multiple versions of IOS
software
Is a type of electronically erasable
programmable ROM (EEPROM)
20. 20
Routers
Read-only memory (ROM)
Maintains instructions for power-on
self test (POST) diagnostics
Stores bootstrap program and basic
operating system software
Requires replacing pluggable chips on
the motherboard for software upgrades
21. 21
Routers
Interfaces
Connect router to network for frame
entry and exit
Can be on the motherboard or on a
separate module
Connect the router to LANs and WANs
25. 25
Routers
Routers have both LAN and WAN
interfaces
The two main functions of a router
Selection of best path
Switching of frames to the proper interface
Routers accomplish this by building
routing tables and exchanging network
information with other routers
27. 27
Routers
A correctly configured internetwork
provides the following:
Consistent end-to-end addressing
Addresses that represent network
topologies
Best path selection
Dynamic or static routing
Switching
28. 28
WANs and the OSI Model
A WAN operates at the physical layer and at
the data link layer
The WAN physical layer describes the
interface between the data terminal
equipment (DTE) and the data circuit-
terminating equipment (DCE)
DCE connects to the service provider (eg. Via
modem)
DTE (router), the services offered to the DTE
are made available through a modem or a
CSU/DSU
30. 30
Routers
The main function of a router is to transmit
data using Layer 3 addresses
This process is also called routing. Routing
occurs at the network layer, which is
Layer 3
If a WAN operates at Layers 1, 2, and 3, is a
router a LAN device or a WAN device?
The answer is both, as is so often the case in the
field of networking. A router may be exclusively a
LAN device, it may be exclusively a WAN device,
or it may sit at the boundary between a LAN and
a WAN and be a LAN and WAN device at the same
time.
31. 31
Routers
One of the roles of a router in a WAN
is to route packets at Layer 3, but this
is also a role of a router in a LAN
Therefore routing is not strictly a WAN
role of a router
When a router uses the physical and data
link layer standards and protocols that
are associated with WANs, it is operating
as a WAN device
32. 32
Routers
Therefore, the main role of a router in a
WAN is not to route, it is to provide
connections between the various WAN
physical and data-link standards
These standards and protocols that define
and structure a WAN connection operate at
Layers 1 and 2
The router must be able to move a stream
of bits from one type of service, such as
ISDN, to another, such as a T1, and change
the data link encapsulation from PPP to
Frame Relay
33. 33
Routers in WAN
WAN physical layer standards and protocols:
EIA/TIA-232
EIA/TIA-449
V.24
V.35
X.21
G.703
EIA-530
ISDN
T1, T3, E1, and E3
xDSL
SONET (OC-3, OC-12, OC-48, OC-192)
34. 34
Routers in WAN
WAN data link layer standards and protocols:
High-level data link control (HDLC)
Frame Relay
Point-to-Point Protocol (PPP)
Synchronous Data Link Control (SDLC)
Serial Line Internet Protocol (SLIP)
X.25
ATM
LAPB
LAPD
LAPF
35. 35
Labs
In the lab, all the networks will be connected
with serial or Ethernet cables and the
students can see and physically touch all the
equipment
In the real world serial cables are not
connected back to back
In the lab, devices that make up the WAN
cloud are simulated by the connection
between the back-to-back DTE-DCE cables;
the connection from one router interface s0/0
to another router interface s0/1 simulates the
whole circuit cloud
39. 39
Router Internal Components
CPU
system initialization
routing functions
network interface control
RAM
used for routing table information
fast switching cache
running configuration
packet queues
run time space for executable Cisco IOS
Upgraded by adding DIMMs
40. 40
Router Internal Components
Flash
stores a full Cisco IOS software image
images can be upgraded by loading a new
image into flash
adding or replacing the flash Single In-Line
Memory Modules (SIMMs) or PCMCIA cards
can upgrade the amount of flash
NVRAM
store the startup configuration
devices retain contents when power is removed
41. 41
Router Internal Components
Buses
System bus is used for communication
between the CPU and the interfaces and/or
expansion slots, transfers the packets to and
from the interfaces
The CPU bus is used by the CPU for
accessing components from router storage,
transfers instructions and data to or from
specified memory addresses
42. 42
Router Internal Components
ROM
Read-only memory (ROM) is used for
permanently storing startup diagnostic code
(ROM Monitor)
ROM runs hardware diagnostics during router
bootup and loading the Cisco IOS software
from flash to RAM
They can only be upgraded by replacing the
ROM chips in the sockets
43. 43
Router Internal Components
Interfaces
local-area network (LANs) – Ethernet, token
ring
Wide-area network (WANs) - serial, ISDN,
and integrated Channel Service Unit (CSUs)
The WAN interfaces may be a fixed
configuration or modular
Console/AUX - serial ports used primarily for
the initial configuration of the router
44. 44
Router Internal Components
Power Supply
The power supply provides the necessary
power to operate the internal components
49. 49
Router External Connections
LAN interfaces allow the router to connect to
the Local Area Network media
Wide Area Network (WAN) connections
provide connections through a service
provider to a distant site or to the Internet
The management port (Console and Auxiliary)
provides a text-based connection for the
configuration and troubleshooting of the
router
EIA-232 asynchronous serial ports
Connected to a communications port on a computer
Computer must run a terminal emulation program
51. 51
Management Ports
The console port and the auxiliary (AUX)
port are management ports
asynchronous serial ports
non-network connections
console port is recommended for this
initial configuration
Management ports used for
configuring the router
monitoring the system
troubleshooting problems
52. 52
Management Ports
The router can be configured from a
remote location by dialing to a modem
connected to the console or auxiliary
port on the router
The console port is preferred for
troubleshooting because
It does not depend on networks services
It displays router startup, debugging, and
error messages by default
The console port can be used for disaster
and password recovery procedure
56. 56
Connecting Console Interfaces
Configure terminal emulation software on the
PC for:
The appropriate com port
9600 baud
8 data bits
No parity
1 stop bit
No flow control
Connect the RJ-45 connector of the rollover
cable to the router console port
Connect the other end of the rollover cable to
the RJ-45 to DB-9 adapter
Attach the female DB-9 adapter to a PC
58. 58
Connecting LAN Interfaces
Router is connected to the LAN using
an Ethernet or Fast Ethernet interface
The router communicates with the LAN
via a hub or a switch using a Straight-
through cable
When Ethernet connection of the router
is connected directly to the computer
or to another router a crossover cable
is required
61. 61
Connecting WAN Interfaces
WAN connection types are leased line, circuit-
switched, and packet-switched
For each type of WAN service, the customer
premises equipment (CPE), often a router,
is the data terminal equipment (DTE)
Service provider uses a data circuit-
terminating equipment (DCE) device,
commonly a modem or channel service
unit/data service unit (CSU/DSU), which
converts the data from the DTE into a form
acceptable to the WAN service provider
63. 63
Connecting WAN Interfaces
Selecting the proper serial cable:
What is the type of connection to the Cisco
device?
Is the network system being connected to
a DTE or DCE device?
What signaling standard does the device
require?
What is the gender of the connector
required on the cable? If the connector
has visible projecting pins, it is male. If the
connector has sockets for projecting pins, it
is female