Repeaters.51
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Repeaters are electronic devices that regenerate signals to extend the range of a local area network (LAN) by connecting two segments. They work at the physical layer of the OSI model by receiving signals, regenerating the original bit pattern, and forwarding the refreshed signal without any filtering or intelligent functions. Repeaters must be placed between segments before the signal becomes too weak or corrupted to extend the physical length and increase the range of a LAN.
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Repeater and hub
This presentation contains.
1. Definition of Repeater.
2. Types of Repeater.
3. Advantages of Repeater.
4. Disadvantage of Repeater.
HUB Device
A network hub connects computers to each other but does not understand the data it transfers. It broadcasts all data packets received from any connected device to all other connected devices, regardless of the intended destination. While hubs are inexpensive and allow multiple devices to connect, they have several disadvantages: they run in half-duplex mode, share bandwidth between ports so each gets a lower speed, and cannot support large networks due to their limited number of ports.
Networking devices
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.
CCNA Introducing Networks
The document provides an overview of computer networking fundamentals including:
- The seven layers of the OSI reference model and their functions from physical transmission to application interfaces.
- Reasons for using a layered networking model including modularity, interoperability, and error checking.
- Key networking concepts such as MAC addresses, connection-oriented vs. connectionless transmission, and data encapsulation.
Router & functionality
A router connects two or more networks and routes packets between them using routing tables. It uses routing algorithms like distance vector or link state to dynamically determine the best paths. As a specialized computer, a router operates at the network layer and can function as a DHCP server, default gateway, and move data between networks through both hardware and software functionality.
MAC & IP addresses
A MAC address is a 48-bit hardware address that uniquely identifies network interfaces for communication in an Ethernet network. It is stored in the network card's firmware and is usually written as 12 hexadecimal digits separated by hyphens. An IP address is a 32-bit logical address that identifies a device on an IP network and can be configured manually or automatically via DHCP. Private IP address ranges like 10.0.0.0/8 and 192.168.0.0/16 are non-routable and used for local area networks.
Router and types
Routers are networking devices that forward data packets between computer networks, routing packets from one router to another until reaching the destination node. There are several types of routers including core routers that forward packets within a network, edge routers that connect a network to external networks, and wireless routers that provide wireless network access in addition to routing. Routers work by receiving packets on one port and forwarding them to the appropriate outgoing port based on routing table information.
IPv4 Addressing
This document discusses the Internet Protocol (IP) version 4 and 6. It describes the key tasks of IP including addressing computers and fragmenting packets. IP version 4 uses 32-bit addresses while IP version 6 uses 128-bit addresses and has improvements like larger address space and better security. The document also covers IP address classes, private addressing, subnetting, Classless Inter-Domain Routing (CIDR), and address blocks.
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Repeater and hub
This presentation contains.
1. Definition of Repeater.
2. Types of Repeater.
3. Advantages of Repeater.
4. Disadvantage of Repeater.
HUB Device
A network hub connects computers to each other but does not understand the data it transfers. It broadcasts all data packets received from any connected device to all other connected devices, regardless of the intended destination. While hubs are inexpensive and allow multiple devices to connect, they have several disadvantages: they run in half-duplex mode, share bandwidth between ports so each gets a lower speed, and cannot support large networks due to their limited number of ports.
Networking devices
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.
CCNA Introducing Networks
The document provides an overview of computer networking fundamentals including:
- The seven layers of the OSI reference model and their functions from physical transmission to application interfaces.
- Reasons for using a layered networking model including modularity, interoperability, and error checking.
- Key networking concepts such as MAC addresses, connection-oriented vs. connectionless transmission, and data encapsulation.
Router & functionality
A router connects two or more networks and routes packets between them using routing tables. It uses routing algorithms like distance vector or link state to dynamically determine the best paths. As a specialized computer, a router operates at the network layer and can function as a DHCP server, default gateway, and move data between networks through both hardware and software functionality.
MAC & IP addresses
A MAC address is a 48-bit hardware address that uniquely identifies network interfaces for communication in an Ethernet network. It is stored in the network card's firmware and is usually written as 12 hexadecimal digits separated by hyphens. An IP address is a 32-bit logical address that identifies a device on an IP network and can be configured manually or automatically via DHCP. Private IP address ranges like 10.0.0.0/8 and 192.168.0.0/16 are non-routable and used for local area networks.
Router and types
Routers are networking devices that forward data packets between computer networks, routing packets from one router to another until reaching the destination node. There are several types of routers including core routers that forward packets within a network, edge routers that connect a network to external networks, and wireless routers that provide wireless network access in addition to routing. Routers work by receiving packets on one port and forwarding them to the appropriate outgoing port based on routing table information.
IPv4 Addressing
This document discusses the Internet Protocol (IP) version 4 and 6. It describes the key tasks of IP including addressing computers and fragmenting packets. IP version 4 uses 32-bit addresses while IP version 6 uses 128-bit addresses and has improvements like larger address space and better security. The document also covers IP address classes, private addressing, subnetting, Classless Inter-Domain Routing (CIDR), and address blocks.
W-LAN (Wireless Local Area Network)
Wireless local area networks (WLANs) use radio waves to connect devices in a building or campus wirelessly. They integrate with wired networks through access points that bridge wireless and wired traffic. WLANs operate similarly to wired LANs but have some differences like lower security, limited bandwidth, and variable performance depending on location within the network coverage area. Common devices that use WLANs include tablets, smartphones and laptops.
Dhcp ppt
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The document discusses the OSI model, which is a standard framework for network communication. It divides network architecture into seven layers: physical, data link, network, transport, session, presentation, and application. Each layer only communicates with the layers directly above and below it and has a specific set of functions. This layered approach makes networks easier to design, troubleshoot, and maintain when changes are made. The physical layer deals with physical connections and bit transmission. The data link layer organizes bits into frames and controls flow. The network layer decides how data moves between networks. Higher layers ensure reliable and secure delivery of data between applications.
Csma cd and csma-ca
The document discusses MAC layer protocols, specifically CSMA/CD and CSMA/CA.
CSMA/CD is used for wired networks and works by having nodes listen to check if the medium is free before transmitting. If a collision is detected, transmission stops and resumes after a backoff time.
CSMA/CA is used for wireless networks and aims to avoid collisions through the use of request to send, clear to send, and acknowledgement frames exchanged between nodes, rather than detecting collisions.
Both protocols reduce collisions compared to simple CSMA, but CSMA/CA is less efficient and cannot completely solve collisions in wireless networks due to issues like hidden terminals.
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The document discusses the network layer in computer networking. It describes how the network layer is responsible for routing packets from their source to destination. It covers different routing algorithms like distance vector routing and link state routing. It also compares connectionless and connection-oriented services, as well as datagram and virtual circuit subnets. Key aspects of routing algorithms like optimality, stability, and fairness are defined.
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Tcp IP Model
Although the OSI reference model is universally recognized, the historical and technical open standard of the Internet is Transmission Control Protocol / Internet Protocol (TCP/IP).
The TCP/IP reference model and the TCP/IP protocol stack make data communication possible between any two computers, anywhere in the world, at nearly the speed of light.
Networking devices
Networking devices connect electronic devices together to share files and resources. They include routers, hubs, switches, bridges, gateways, and network interface cards. Routers direct network traffic and route information between local area networks. Hubs connect devices physically but copy all data to every port. Switches intelligently send data only to the destination port, unlike hubs. Bridges connect networks using the same protocol, while gateways allow communication across different networks using protocols. Network interface cards provide the physical connection between a computer and the network.
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Ppt of routing protocols
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Networking devices
Networking devices connect electronic devices together to share resources and include devices like hubs, switches, routers, and network interface cards. A repeater receives and retransmits signals to extend range without degradation and works at the physical layer. A hub is a multiport repeater that connects multiple wires in a star topology. A bridge connects two networks and works at the data link layer, maintaining a MAC address table to selectively forward data. A switch is an efficient, multi-port bridge that can check for errors and selectively forward packets to the correct port. A router routes packets based on IP addresses and connects LANs and WANs at the network layer.
Router
A router forwards data packets between computer networks based on IP addresses. It examines header information in each packet and determines the best path to send it towards its destination, choosing the route with the lowest cost. Routers work at the IP protocol level and maintain routing tables with information about neighboring routers and the costs of routes to efficiently transmit data packets between networks.
Networking devices
A network adapter, also called a network interface card (NIC), enables a computer to connect to a network and transfer data. There are wired and wireless NICs. Wired NICs use cables while wireless NICs use radio waves. Modern laptops have both wired and wireless NICs. NIC speeds can be 10Mbps, 100Mbps, 1000Mbps or higher but the actual speed depends on the network switch speed.
Hub, switch, router, bridge & and repeater
This document provides descriptions of various networking devices including hubs, switches, routers, bridges, and repeaters. It explains that hubs connect multiple devices but do not filter data or determine the best path for data packets. Switches maintain a list of network addresses and transmit data packets to the correct port, allowing for faster transmission speeds than hubs. Routers route data packets based on IP addresses and connect local and wide area networks. Bridges divide large networks into smaller segments and connect different network types/architectures. Repeaters regenerate weak signals to extend transmission distances but do not amplify signals.
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Ethernet is a family of networking technologies commonly used in LANs, MANs and WANs. It was first standardized in 1983 at 10 Mbps and has since been updated to support higher speeds up to 10 Gbps. Fast Ethernet runs at 100 Mbps using the same frame format as standard Ethernet. Gigabit Ethernet runs at 1 Gbps while maintaining compatibility. Ten-Gigabit Ethernet operates at 10 Gbps while keeping the same frame format as prior standards.
Routing
This document provides an overview of routing concepts and protocols. It discusses the basic components of routing including algorithms, databases, and protocols. It describes different routing algorithm types such as static, distance vector, and link state. Specific routing protocols covered include RIP, OSPF, and BGP. It also discusses routing within autonomous systems and between autonomous systems on the internet.
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Cisco Packet Tracer is a network simulation program that allows students to experiment with network behavior. The document describes how to set up three example networks using Packet Tracer. It explains how to connect routers and PCs, assign IP addresses to devices, and configure routing protocols to allow communication between the networks. Setting up the example networks demonstrates how to build and test a multi-network topology in Packet Tracer.
Wireless repeaters
A wireless repeater receives an existing Wi-Fi signal from a router or access point and rebroadcasts it to extend the range of the network. It can bridge long distances that devices cannot connect directly or improve signals in areas with interference. However, throughput is reduced by half and interference is doubled compared to direct connection. Compatibility with older encryption and wireless standards can also impact a repeater's effectiveness. Alternatives include configuring additional routers or access points with wired backhaul, or using powerline networking devices to broadcast Wi-Fi in dead spots. Properly positioning routers and upgrading antennas can also boost a network's range without using a repeater.
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Wireless local area networks (WLANs) use radio waves to connect devices in a building or campus wirelessly. They integrate with wired networks through access points that bridge wireless and wired traffic. WLANs operate similarly to wired LANs but have some differences like lower security, limited bandwidth, and variable performance depending on location within the network coverage area. Common devices that use WLANs include tablets, smartphones and laptops.
Dhcp ppt
DHCP is a protocol that dynamically assigns IP addresses and other network configuration parameters to devices on a network. It uses a client-server model where DHCP clients make requests to DHCP servers which maintain pools of addresses. A DHCP client will broadcast requests at initialization and use a 4-step process to get an address assigned. It will later enter renewal states to extend its lease before initialization again if needed. This allows for efficient dynamic allocation and management of IP addresses on a network.
Switches on Networking
A network switch is a telecommunications device that receives messages and sends them to their intended destinations. It connects network segments or devices and forwards data to one or multiple targets that need to receive it. Switches operate at the data link layer to process and forward data, unlike hubs but similar to routers. They improve network performance by reducing broadcast domains and using hardware to map ports to device addresses.
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The document discusses the OSI model, which is a standard framework for network communication. It divides network architecture into seven layers: physical, data link, network, transport, session, presentation, and application. Each layer only communicates with the layers directly above and below it and has a specific set of functions. This layered approach makes networks easier to design, troubleshoot, and maintain when changes are made. The physical layer deals with physical connections and bit transmission. The data link layer organizes bits into frames and controls flow. The network layer decides how data moves between networks. Higher layers ensure reliable and secure delivery of data between applications.
Csma cd and csma-ca
The document discusses MAC layer protocols, specifically CSMA/CD and CSMA/CA.
CSMA/CD is used for wired networks and works by having nodes listen to check if the medium is free before transmitting. If a collision is detected, transmission stops and resumes after a backoff time.
CSMA/CA is used for wireless networks and aims to avoid collisions through the use of request to send, clear to send, and acknowledgement frames exchanged between nodes, rather than detecting collisions.
Both protocols reduce collisions compared to simple CSMA, but CSMA/CA is less efficient and cannot completely solve collisions in wireless networks due to issues like hidden terminals.
Network Layer,Computer Networks
The document discusses the network layer in computer networking. It describes how the network layer is responsible for routing packets from their source to destination. It covers different routing algorithms like distance vector routing and link state routing. It also compares connectionless and connection-oriented services, as well as datagram and virtual circuit subnets. Key aspects of routing algorithms like optimality, stability, and fairness are defined.
Wifi & 802.11 Standards
Wi-Fi uses radio waves to transmit data through the air according to the IEEE 802.11 standards. It allows computers and other devices to connect to the internet and each other wirelessly. The 802.11 standards include 802.11b, 802.11a, 802.11g, 802.11n, and 802.11ac which provide different speeds and capabilities. Wi-Fi networks use access points, wireless cards, and security protocols like WEP, WPA, and WPA2 to transmit data securely between devices over short ranges.
Networking devices
Networking devices are components that connect electronic devices and allow them to share resources over a network. Common networking devices include network interface cards, hubs, switches, bridges, routers, and modems. A switch connects network segments and can perform error checking before forwarding data packets between devices on a local area network. A router connects two or more networks and reads address information in packets to determine the best path to forward packets between networks. Routers work at the network layer and contain routing tables to define the addresses of connected networks.
Tcp IP Model
Although the OSI reference model is universally recognized, the historical and technical open standard of the Internet is Transmission Control Protocol / Internet Protocol (TCP/IP).
The TCP/IP reference model and the TCP/IP protocol stack make data communication possible between any two computers, anywhere in the world, at nearly the speed of light.
Networking devices
Networking devices connect electronic devices together to share files and resources. They include routers, hubs, switches, bridges, gateways, and network interface cards. Routers direct network traffic and route information between local area networks. Hubs connect devices physically but copy all data to every port. Switches intelligently send data only to the destination port, unlike hubs. Bridges connect networks using the same protocol, while gateways allow communication across different networks using protocols. Network interface cards provide the physical connection between a computer and the network.
IEEE standards 802.3.&802.11
The document discusses various IEEE 802 standards for networking technologies including Ethernet, wireless LAN (802.11), and their variants and evolutions over time. It provides details on Ethernet standards and implementations such as 802.3, 10BASE5, 10BASE2, 10BASE-T, 10BASE-F, Fast Ethernet, and Gigabit Ethernet. It also summarizes key aspects of wireless networking standards such as 802.11 components, frame format, and physical layer specifications including FHSS, DSSS, OFDM, and associated data rates and frequencies.
Ppt of routing protocols
Routing protocols allow routers to communicate and exchange information that helps determine the best path between networks. The main types are static routing, where routes are manually configured, and dynamic routing, where routes are automatically updated as network conditions change. Common dynamic routing protocols include RIP, IGRP, EIGRP, and OSPF, which use different algorithms and metrics like hop count or bandwidth to calculate the best routes.
Networking devices
Networking devices connect electronic devices together to share resources and include devices like hubs, switches, routers, and network interface cards. A repeater receives and retransmits signals to extend range without degradation and works at the physical layer. A hub is a multiport repeater that connects multiple wires in a star topology. A bridge connects two networks and works at the data link layer, maintaining a MAC address table to selectively forward data. A switch is an efficient, multi-port bridge that can check for errors and selectively forward packets to the correct port. A router routes packets based on IP addresses and connects LANs and WANs at the network layer.
Router
A router forwards data packets between computer networks based on IP addresses. It examines header information in each packet and determines the best path to send it towards its destination, choosing the route with the lowest cost. Routers work at the IP protocol level and maintain routing tables with information about neighboring routers and the costs of routes to efficiently transmit data packets between networks.
Networking devices
A network adapter, also called a network interface card (NIC), enables a computer to connect to a network and transfer data. There are wired and wireless NICs. Wired NICs use cables while wireless NICs use radio waves. Modern laptops have both wired and wireless NICs. NIC speeds can be 10Mbps, 100Mbps, 1000Mbps or higher but the actual speed depends on the network switch speed.
Hub, switch, router, bridge & and repeater
This document provides descriptions of various networking devices including hubs, switches, routers, bridges, and repeaters. It explains that hubs connect multiple devices but do not filter data or determine the best path for data packets. Switches maintain a list of network addresses and transmit data packets to the correct port, allowing for faster transmission speeds than hubs. Routers route data packets based on IP addresses and connect local and wide area networks. Bridges divide large networks into smaller segments and connect different network types/architectures. Repeaters regenerate weak signals to extend transmission distances but do not amplify signals.
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An internetwork connects individual networks together so they function as a single large network. It addresses the challenges of connecting different networks that may use varying technologies and speeds. The OSI reference model describes how information passes through seven layers as it moves between software applications on different computer systems. Each layer adds control information in the form of headers and trailers to communicate with its peer layer on other systems. This allows information to be reliably exchanged between networked devices.
Ethernet Computer network
Ethernet is a family of networking technologies commonly used in LANs, MANs and WANs. It was first standardized in 1983 at 10 Mbps and has since been updated to support higher speeds up to 10 Gbps. Fast Ethernet runs at 100 Mbps using the same frame format as standard Ethernet. Gigabit Ethernet runs at 1 Gbps while maintaining compatibility. Ten-Gigabit Ethernet operates at 10 Gbps while keeping the same frame format as prior standards.
Routing
This document provides an overview of routing concepts and protocols. It discusses the basic components of routing including algorithms, databases, and protocols. It describes different routing algorithm types such as static, distance vector, and link state. Specific routing protocols covered include RIP, OSPF, and BGP. It also discusses routing within autonomous systems and between autonomous systems on the internet.
Packet tracer
Cisco Packet Tracer is a network simulation program that allows students to experiment with network behavior. The document describes how to set up three example networks using Packet Tracer. It explains how to connect routers and PCs, assign IP addresses to devices, and configure routing protocols to allow communication between the networks. Setting up the example networks demonstrates how to build and test a multi-network topology in Packet Tracer.
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Network Devices
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Chapter 3 1-network_design_with_internet_tools - Network Design
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Repeaters.51
- 1. Sub topic : Repeaters * 1
- 2. Recap In the previous class, you have learnt about • Internet • History of Internet • Advantages of Internet • Internet today * 2
- 3. Objectives On completion of this period, you would be able to understand about • Definition of a Repeater • Importance of Repeaters • Function of a Repeater • Location of a Repeater * 3
- 4. Definition of a repeater • A Repeater is an electronic device that simply regenerates a signal • A connecting device between two segments of a LAN • It works at physical layer of OSI model * 4
- 5. Repeater at physical layer A B Application layer Application layer Presentation layer Presentation layer Session layer Session layer Transport layer Transport layer Network layer Network layer Data link layer Data link layer Physical layer Repeater Physical layer * 5
- 6. Importance of Repeaters • It can extend physical length of a LAN • A repeater can overcome the 10Base5 Ethernet length restriction • Repeater can divide the network in to segments • Range of LAN can be increased * 6
- 7. Functions of Repeater • It receives a signal before it becomes too weak or corrupted • Regenerates the original bit pattern • The repeater forwards the refreshed signal • It works in the physical layer * 7
- 8. Functions of Repeater contd… • It has no filtering capability • It is a regenerator, not an amplifier • It does not perform any intelligent function * 8
- 9. Functions of Repeater contd… Repeater Regenerated signal Corrupted signal Right- to- Left Transmission Repeater Corrupted signal Regenerated signal Left-to Right Transmission * 9
- 10. Location of a Repeater • A repeater must be placed so that a signal reaches it before any noise changes the meaning of any of its bits • A repeater placed on the line before the legibility of the signal becomes lost * 10
- 11. 5 5 4 4 3 3 2 2 1 1 1 1 Repeater Segment 1 Segment 2 Fig .3 Repeater connecting two segments of a LAN * 11
- 12. Capabilities of a Repeater • It must be placed between two segments of same LAN just before any noise changes the meaning of any of its bits • Just before the signal collapses or change the meaning of bit pattern • A repeater placed on the line before the legibility of the signal becomes lost can still read the signal well enough to determine the intended voltages and replicate them in their original form * 12
- 13. Limitations of a Repeater • A repeater does not connects two LAN’s • A repeater cannot connect two networks of different protocols • A repeater does not act as an amplifier or as a filter * 13
- 14. Summary In this class, you have learnt about • Importance of repeaters • Definition of repeater • Function of repeater • Location of a repeater * 14
- 15. Quiz 1. A Repeater is a device which connects ? (a) Two LANs (b) Two segments of a same LAN (c) Two WANs * 15
- 16. Quiz 2. Repeater is a _____________ (a) Regenerator (b) An Amplifier (c) Filter * 16
- 17. Frequently Asked Questions 1. Define Repeater 2. Explain the operation of a repeater 3. What are different functions of a repeater 4. What is the importance of a repeater 17