Iuwne10 S01 L10
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Wireless networks can be organized in a peer-to-peer or access point configuration, using standards defined by IEEE and Wi-Fi Alliance, with different frame types sent at varying speeds. Key aspects include describing wireless waves using wavelength, frequency and amplitude; measuring power levels in dBm and dBi; using antennae that can be directional or omnidirectional; employing techniques like DSSS for interference resistance; and utilizing VLANs on the Ethernet side to isolate groups defined by SSIDs.
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Presented by
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Definition
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So Wireless Technology
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Similar to Iuwne10 S01 L10
Wireless TechnologiesPresented bySean Shields AndGabriel.docx
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Presented by
Sean Shields
And
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Definition
Term “Wireless” refers to all the communications sent and received without wires.
So Wireless Technology
Means a technology that use radio waves to transmit or receive data.
Wi-Fi
Bluetooth
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TYPES OF
TECHNOLOGIES
INTRODUCTION:
Wireless Fidelity termed as Wi-Fi uses the IEEE 802.11 specification to create a wireless local-area network.
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HOW WIFI WORKS?
1. All devices use a wireless adapter to convert request into a radio signal and broadcasts it into the air.
2. The Wi-Fi device, or wireless router, picks up the signal and translates it back into its original form.
3. The router passes the request to the Internet using a hardwired connection.
4. The Internet returns the requested information to the router across the same connection.
5. The router converts the information into a radio signal and broadcasts it into the air.
6. The computer or cell phone's wireless adapter picks up the information and displays it on your screen
WIFI TOPOLOGIES
Wifi have following topologies
AP-based topology (Infrastructure Mode)
Peer-to-peer topology (Ad-hoc Mode)
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Wireless local area networks (WLANs) use either radio frequency or infrared transmission to connect devices within a local coverage area and provide internet access through an access point. There are two main network architectures - infrastructure networks with an access point that controls communication, and ad-hoc networks that allow direct communication between nodes without infrastructure. IEEE 802.11 standards define the physical and media access control layers for wireless LANs and allow them to integrate with wired Ethernet networks through bridges.
Wireless comm & wireless network my seminar
The document is a presentation about wireless communications and wireless networks. It discusses key topics such as wireless technology, IEEE 802.11 wireless LAN standards, secure wireless LANs, and migrating to wireless LANs. The presentation outlines different wireless network types, how wireless LANs work and differ from wired LANs, common wireless network topologies, and details of specific 802.11 wireless standards including 802.11a, 802.11b, and 802.11g.
WI-FI and Wi Max
Wi-Fi and WiMAX are wireless networking technologies. Wi-Fi uses radio waves to connect devices in local areas like homes and offices, while WiMAX can connect devices over longer distances of up to 30 miles, making it suitable for connecting entire cities. Both technologies transmit data using radio signals in specific frequency ranges and support various transmission speeds and encryption standards. Wi-Fi devices connect directly to a local wireless router or access point, while WiMAX uses wireless towers similar to cellular networks to connect multiple users over wider areas.
Verilog Based Design and Simulation of MAC and PHY Layers for Zigbee Digital ...
The past several years have witnessed a rapid development in the wireless network area. So far wireless networking has been focused on high-speed and long range applications. Zigbee technology was developed for a Wireless Personal Area Networks (WPAN), aimed at control and military applications with low data rate and low power consumption. Zigbee is a standard defines the set of communication protocols for low-data-rate short-range wireless networking. Zigbee-based wireless devices operate in 868 MHz, 915 MHz, and 2.4 GHz frequency bands. The maximum data rate is 250K bits per second. Zigbee is mainly for battery-powered applications where low data rate, low cost, and long battery life are main requirements. This paper explores Verilog design for various blocks in Zigbee Transmitter architecture for an acknowledgement frame. The word digital has made a dramatic impact on our society. Developments of digital solutions have been possible due to good digital system design and modeling techniques. Further developments have been made and introduced VLSI in order to reduce size of the architecture, to improve speed of operation, improvements in predictability of the circuit behavior. Digital Zigbee Transmitter comprises of Cyclic Redundancy Check, Bit-to-Symbol block, Symbol-to-chip block, Modulator and Pulse shaping block. The work here is to show how we can design Zigbee transmitter with its specifications by using Verilog with less number of slices and Look up tables (LUTs).
Wireless networksppt
The document discusses wireless local area networks (WLANs) and the IEEE 802.11 standards. It provides an overview of wireless technology, outlines the 802.11 standards including 802.11a, 802.11b, 802.11g, security features, and challenges. It also summarizes how WLANs integrate with existing networks through access points and allow roaming between coverage areas.
Wireless networksppt
The document discusses wireless local area networks (WLANs) and the IEEE 802.11 standards. It provides an overview of wireless technology, outlines the 802.11 standards including 802.11a, 802.11b, 802.11g, security features, and challenges. It also summarizes how WLANs integrate with existing networks through access points and allow roaming between coverage areas.
MESH WIFI.pdf
A mesh Wi-Fi system, also known as a whole-home Wi-Fi system, uses a series of nodes or access points that connect to each other and expand the reach of a wireless signal. It’s flexible and easily scalable, which enables a customizable method of expanding Wi-Fi reach without the use of range extenders, which usually degrade network performance.
The network infrastructure is decentralized and simplified, as one node or access point only needs to transmit as far as the next node or access point closest to it. A wireless mesh network may or may not be connected to the internet, for example, in the case of a wireless alarm system in a large home or building.
MESH WIFI NETWORK : An understanding of Mesh Networking
A mesh Wi-Fi system, also known as a whole-home Wi-Fi system, uses a series of nodes or access points that connect to each other and expand the reach of a wireless signal. It’s flexible and easily scalable, which enables a customizable method of expanding Wi-Fi reach without the use of range extenders, which usually degrade network performance.
Wi-Fi and Wi-max
Wi-Fi and WiMAX are wireless networking technologies that use radio waves and have standards specified by IEEE. Wi-Fi provides short range connectivity using technologies like 802.11b, 802.11a, 802.11g and 802.11n. WiMAX is a wireless broadband technology that provides longer range connectivity using standards like 802.16 and 802.16e. Both have advantages like mobility and convenience but Wi-Fi has limitations in range and speed while WiMAX installations have higher costs.
8. Wireless (1).ppt
The document discusses various wireless networking technologies and standards. It provides details on:
- Types of wireless technologies including Wi-Fi, Bluetooth, RFID, WiMax.
- Wireless networking standards set by IEEE including 802.11, 802.11a, 802.11b, 802.11g, 802.11n and 802.11ac.
- Components of wireless networks such as routers, gateways, antennas, and security methods like WEP, WPA, WPA2.
Wi Fi
Wi-Fi, also known as IEEE 802.11, is a set of standards that allow wireless devices to communicate and connect to networks. There are different Wi-Fi standards that support various speeds and frequencies. Wi-Fi networks can operate in either ad hoc or infrastructure modes. Infrastructure mode uses access points to connect wireless devices to a wired network and each other, while ad hoc mode allows direct peer-to-peer connections. Wi-Fi networks employ techniques like CSMA/CA and RTS/CTS to allow multiple devices to share the wireless channel and avoid collisions.
Wi fi[1]
Wi-Fi, also known as IEEE 802.11, is a set of standards that allow wireless devices to communicate. It operates in unlicensed frequency bands like 2.4 GHz and 5 GHz. There are different Wi-Fi standards that support varying speeds like 802.11b at 11 Mbps and 802.11a at 54 Mbps. Wi-Fi networks can be configured in different modes like ad-hoc for device-to-device or infrastructure which uses an access point. Access points allow multiple devices to connect and share a wireless signal. Wi-Fi uses techniques like spread spectrum, carrier sensing, and packetization to allow many devices to communicate simultaneously over the same wireless channel.
NC.pptx prepared for all students of higher education
The document discusses various wireless technologies including infrared (IR), Bluetooth, Wi-Fi, and cellular networks. It describes the key characteristics of different wireless standards like 802.11a, 802.11b, 802.11g and how they operate in the 2.4GHz and 5GHz spectrums. It also covers wireless network topologies including ad-hoc networks, basic service sets (BSS), extended service sets (ESS) and how access points are used to connect devices and control communications in a wireless network.
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Wireless TechnologiesPresented bySean Shields AndGabriel.docx
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Verilog Based Design and Simulation of MAC and PHY Layers for Zigbee Digital ...
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MESH WIFI NETWORK : An understanding of Mesh Networking
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NC.pptx prepared for all students of higher education
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More from Ravi Ranjan
Iuwne10 S06 L04
This document discusses upgrading Cisco wireless controllers and Cisco WCS software from a web interface, saving and restoring configuration files, and how wireless signals can be affected by walls, moving objects, and non-WiFi sources. It also mentions that different applications require specific wireless coverage patterns and that controllers and Cisco WCS offer tools to understand network conditions and troubleshoot wireless clients.
Iuwne10 S06 L03
The document provides guidance on troubleshooting wireless LAN issues through checking visual elements, common controller and client issues, and using Cisco Wireless LAN Controller commands and displays. It highlights using debug commands, show commands, and logs to test layer 2 and layer 3 connectivity and diagnose problems. Third-party packet sniffers and Cisco Spectrum Expert can also assist with troubleshooting.
Iuwne10 S06 L02
A site survey is important for both pre-deployment planning and post-deployment verification of a wireless network. During pre-deployment, a site survey identifies areas with problematic signal attenuation and determines optimal access point positions and density. After deployment, a site survey audits coverage, roaming performance, and any RF issues. The type of wireless devices and their usage, as well as desired packet performance, influence coverage area size and cell overlap requirements.
Iuwne10 S06 L01
The document discusses maintaining a wireless LAN controller including upgrading the controller platform and code version, applying configuration changes, and backing up and restoring the controller configuration and Cisco WCS database. Key steps include checking the controller and AP inventory, upgrading controller code through the GUI which requires a reboot, uploading and downloading configuration files which can be encrypted, backing up the configuration to a TFTP server or manually from the CLI, and automatically backing up the Cisco WCS database when installing new versions.
Iuwne10 S05 L07
Cisco WCS is a management tool that can be installed on servers to configure and manage wireless LWAPP controllers and access points using SNMP. It allows administrators to view maps of the wireless network with devices located and tracked either temporarily or constantly when used with Cisco's Location Appliance.
Iuwne10 S05 L06
Cisco WCS is network monitoring software that allows users to personalize a home page with tabs. It includes a Monitor menu to check controllers, access points, clients, and security events. The software displays an alarm dashboard that identifies issues through different color codes. Cisco WCS also has location capabilities to track wireless devices on a map with 90% accuracy within 10 meters using closest AP, triangulation, or fingerprinting methods. It can locate up to 2,500 devices with a Cisco Location Appliance for more precise positioning.
Iuwne10 S05 L05
Maps in Cisco WCS are used to monitor wireless access point coverage and locate devices. The map levels include campus, building, and floor. Floor maps can have access points added and positioned. The map editor refines the predictive heat map generated by WCS to increase accuracy by defining obstacles like walls. A planning tool is also available to design new access point placement and coverage.
Iuwne10 S05 L04
This document discusses managing wireless networks from Cisco WCS, including adding controllers, configuring access points, performing audits to compare configurations, creating templates to apply configurations, grouping configurations, and using auto-provisioning to automatically configure controllers.
Iuwne10 S05 L03
The document summarizes the administration interface of Cisco WCS. It has a login screen that defaults to the server IP over HTTPS. The main administration menu allows managing background tasks, users and groups, audit trails, logging, data management, mail servers, and user preferences. Specifically, the AAA section is used to define and manage administrative users, while the settings menu configures data aggregation and log file parameters to control database size over time.
Iuwne10 S05 L02
Cisco WCS is network management software that requires certain hardware specifications depending on the number of access points and controllers it will manage. The installation process involves opening required ports, setting up FTP and TFTP root folders, and installing Cisco WCS and its dependencies, with a log file created to verify successful installation. After installing, a license file must be uploaded to Cisco WCS to activate it and allow device management capabilities.
Iuwne10 S05 L01
Cisco WCS is centralized wireless network management software that allows administrators to manage devices, track wireless clients and assets, and perform wireless network planning and monitoring. It offers various license types depending on the number of access points and servers to be managed. Cisco WCS Navigator can manage up to 30,000 access points across multiple WCS servers. It provides inventory reports, search functions, and backup of regional WCS configurations.
Iuwne10 S04 L07
The document discusses authentication and encryption for wireless networks. It states that open authentication provides no user authentication while WEP provides weak authentication and encryption. It recommends using a central server and individually authenticating each user for stronger authentication. WPA and WPA2 create a framework for stronger authentication and encryption, and Cisco Centralized Key Management can be added to increase roaming efficiency. Most security features can be configured on the controller and EAP types will be relayed while the controller uses encryption angle to categorize the security type.
Iuwne10 S04 L06
WLAN security can be configured through the Layer 2, Layer 3, and Security menus. 802.1X uses RADIUS server authentication with optional WEP encryption, while WPA/WPA2 supports both RADIUS server-based enterprise and personal pre-shared key modes. Different client devices provide interfaces for selecting security types including 802.1X, WPA, WPA2, and open networks with web-based authentication.
Iuwne10 S04 L04
EAP-TLS uses certificates and PKI for mutual authentication between clients and RADIUS servers, requiring client and server certificates that must be managed. EAP-FAST establishes a secure tunnel using dynamically generated PACs instead of certificates. PEAP provides one-way authentication from server to client using a server certificate, allowing different inner authentication methods like EAP-GTC and EAP-MSCHAPv2 without client certificates. Cisco LEAP authenticates users via a username and password with dynamic WEP keys.
Iuwne10 S04 L05
WPA introduced a pre-standard framework to improve WEP security by allowing for 802.1X authentication and enhancing the encryption protocol. WPA2 was later standardized and implemented the full 802.11i specification, migrating authentication and encryption to be based on 802.1X and the stronger AES protocol. Additional features were introduced to improve security such as per-packet key mixing and centralized key management solutions to facilitate secure roaming.
Iuwne10 S04 L02
The document discusses various wireless LAN security protocols defined in IEEE 802.11 including open authentication, WEP authentication and encryption, and MAC address filtering. It notes that WEP has weaknesses like weak encryption, repeating initialization vectors that can be used to crack keys, and each client and access point must be configured with matching WEP keys. MAC address filtering allows controlling client access per WLAN by checking MAC addresses against a local or RADIUS server database.
Iuwne10 S04 L01
Cisco WCS is a management tool that can be installed on servers to configure and manage wireless LWAPP controllers and access points using SNMP. It allows administrators to view maps of the wireless network with devices located and tracked either temporarily or constantly when used with the Location Appliance.
Iuwne10 S04 L03
This document discusses different methods for wireless LAN security and authentication. It describes how 802.1X and EAP provide a framework for centralized WLAN authentication through the use of RADIUS servers. It also explains that WLAN controllers can perform local EAP authentication using internal user databases or LDAP servers if RADIUS authentication fails or is not configured.
Iuwne10 S03 L05
Major operating systems offer basic wireless configuration utilities while Cisco provides more advanced tools like the ADU, SSU, ASTU and ACAU to configure Cisco cards and perform network analysis and troubleshooting. The SSC and administration utility combine ease of use for small office wireless networks with secure configuration and deployment of enterprise network profiles. The Cisco Compatible Extensions program allows clients to benefit from over 70 Cisco innovations through more than 70 features.
Iuwne10 S03 L03
The Cisco Secure Services Client (SSC) allows secure management of wired and wireless connections. It includes a 90-day trial license for full features or non-expiring licenses for wired-only or full wired and wireless access. The SSC client is easy to install and groups connections logically. It allows users to create simple wireless profiles while the administration utility defines complex security policies, profiles, and license deployment.
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