1 / 32

Wireless Networking Wireless Devices Module-7A

Wireless Networking Wireless Devices Module-7A. Jerry Bernardini Community College of Rhode Island . Presentation Reference Material. CWNA Certified Wireless Network Administration Official Study Guide (PWO-104), David Coleman, David Westcott, 2009, Chapter-10. WLAN Client Devices.

lucio
Download Presentation

Wireless Networking Wireless Devices Module-7A

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Wireless NetworkingWireless Devices Module-7A Jerry Bernardini Community College of Rhode Island Wireless Networking J. Bernardini

  2. Presentation Reference Material • CWNA Certified Wireless Network Administration Official Study Guide (PWO-104), David Coleman, David Westcott, 2009, Chapter-10 Wireless Networking J. Bernardini

  3. WLAN Client Devices • PC Cards • ExpressCard • CardBus • PCMCIA • Some support external antennas • USB devices • External cable • Variable position and antenna • Compact Flash Devices • SD Devices • PCI Cards • Mini-PCI Cards • Laptop applications Wireless Networking J. Bernardini

  4. Cisco Aironet 802.11b Client Adapters • 2.4 GHz • 802.11b • 11 Mbps • Include • PC Card • PCI Card • LMC Card • Mini PCI

  5. Cisco Aironet 350 Series Mini PCI • 2.4 GHz/802.11b embedded wireless for notebooks • 100 mW transmit power • Must order through PC manufactures (not orderable directly through Cisco)

  6. 5 GHz/802.11a 54 Mbps Rate Shifting 6, 9, 12, 18, 24, 36, 48, or 54 Fixed data rates User configurable option 5 dBi Patch Antenna CardBus interface Transmit power settings: 20 mW, 10 mW, and 5 mW Cisco Aironet 802.11a Client Adapter

  7. PCMCIA, (PC) Cards

  8. Compact Flash • Compact Flash, (CF) - CompactFlash Association, CFA

  9. CF Wireless 802.11b (WiFi)

  10. Wireless USB Adapters

  11. PCI and ISA Adapters

  12. Adapters SD to USB SD to PC CF to PC USB to Serial

  13. Ethernet Adapters

  14. Access Points • The Access Point (AP) is the device that provides access to the WLAN • Each BSS has one AP and multiple Aps make an ESS • Two categories of APs are Fat and Thin Access Points • Thin AP’s are paired with a wireless LAN switch or controller to offer additional functionality and centralization over Fat AP’s. • Fat (Thick or Smart) AP’s are "fat" because they operate autonomously as members of a decentralized WLAN. 3Com Wireless LAN Switch WX1200 3Com AP3750 MAP

  15. Autonomous or FAT Access Points • Traditional wireless LANs use decentralized Fat access points • Manual configuration required to set the power level, channel, security and other configurable parameters. • Each access point is individually configured • Third party software solutions are often needed for additional security and management capabilities • For large networks which quickly add to the total cost of ownership. Wireless Networking J. Bernardini

  16. Autonomous AP Implementation Wireless Networking J. Bernardini

  17. Lightweight or Thin Access Points • Centralized WLANs use a wireless controller to manage, process, and configure the RF environment • Centralized WLANs use called thin or lightweight APs • Aps communicate directly with the central controller with the wired network • All the functionality and intelligence is offloaded to the controller • This provides a single point of administration for various policies relating to security, intrusion detection, user roles, and software upgrades.. Wireless Networking J. Bernardini

  18. Thin Access Points Implementation Wireless Networking J. Bernardini

  19. Access Points Market Belkin APs Buffalo APs Linksys APs Cisco APs Wireless Networking J. Bernardini

  20. Access Point Features • Support of various IEEE 802.11 standards • FHSS, DSSS, OFDM, 802.11a,b, g, n • Support for various security standards • IEEE 802.11i, WEP, WPA, WPA2, PSK, RADIUS • Support for QoS extensions • Wireless Multimedia (WMM), VoWLAN • Fixed or Detachable Antenna • Omni-directional, Directional • Filtering • MAC, Protocol • Variable Power • Percent of Max or Actual Levels Wireless Networking J. Bernardini

  21. Power Over Ethernet (PoE) Support • Found on Enterprise and not on SOHO APs • Primary benefit is ability to install APs where no AC power is present • IEEE 802.3af standard for PoE • PoE is supply by injectors or switches Wireless Networking J. Bernardini

  22. PoE Options and Power Source Equipment(PSE) Active/PSE Switch PD Access Point Pins 4-5 +Power(48v) Pins 7-8 –Power 1 DC Power CAT-5e Ethernet PD Access Point 2 Switch AC Power DC Power CAT-5e Ethernet PSE Injector Access Point DCPower 3 Switch AC Power DC Power CAT-5e Ethernet PSE Injector Tap/Splitter

  23. Wireless Bridges • Provides a link between two WLAN segments • Not full described by IEEE 802.11 • Vendor dependent • Two Modes – Root and Non-root Point-to-Point Root Non-Root Non-Root Root Non-Root Point-to-Mulitpoint

  24. WLAN Bridge Modes and Components • Root Mode – A bridge that acts as the hub to a group of bridges. • Only One Root-Bridge for PtP or PtMP links (important for tests) • For PtP link one Root-Bridge and one Non-Root Bridge • Non-Root Mode – A member bridge of a group that is not the Root Bridge. • Can also function as a standard AP • Can function as a repeater 3Com WLAN Bridge Proxim Quick Bridge 11 Cisco Aironet 1400

  25. Richardson Elementary Yagi Weaver- Special Education Dish Roberts Middle School Dish High School 2 Bridges One 12 dBi omni One Dish Administration 2 Bridges One 12 dBi omni One Yagi Channel #1 Channel #6 Bolich Middle School Yagi Channel #11 Price Elementary Yagi Dewitt Elementary Yagi Bridge Application: School District Bode Elementary Yagi Lincoln Elementary Yagi

  26. Residential WLAN Gateways • Same as SOHO wireless routers • Support of various IEEE 802.11 standards • FHSS, DSSS, OFDM, 802.11a,b, g, n • Support for various security standards • IEEE 802.11i, WEP, WPA, WPA2, PSK, RADIUS • Built in firewall features • Packet and MAC Filtering • Switched Ethernet ports • DHCP • NAT and PAT Wireless Networking J. Bernardini

  27. Enterprise WLAN Wireless Networking J. Bernardini

  28. Enterprise Wireless Gateways • Enterprise Wireless Gateway – is a powerful device that interfaces between the enterprise network and the corporate firewall. • HTML  WML • Authentication, Filtering, and Security • Traffic Management, QoS • Mobile Addressing Vernier IS 6500p BlueSecure ControllerBSC 2100

  29. Internet Enterprise Wireless Gateways Enterprise Server Enterprise Gateway Router Switch Access Points Wireless Clients

  30. Wireless Mesh Access Points • Mesh APs associate with multiple APs • Association between APs is limited by vendor (3-5) • Currently vendor dependent • Clients can reach destinations thru multiple APs • APs route packets to ovoid failures and optimal paths • Mesh Networks are more resilient • Not every AP has to be connected to a wired network • Self-Healing, Self-Configuring using Layer-2 Protocol • New standard IEEE 802.11s will allow interoperability between vendors Wireless Networking J. Bernardini

  31. Wireless Mesh Network Implementation Wireless Networking J. Bernardini

  32. Voice Over IP WLAN (VoWLAN) • Telephone communication using a WLAN requires latency and QoS considerations • Special equipment is required • VoWLAN phone (phones that will connect to WLAN) • WLAN infrastructure with QoS (low latency and Protocol management) • Call management (PBX for IP phones) • Voice gateway for outside calls • IP phones associate with APs rather than cellular towers Linksys Siemens Wireless Networking J. Bernardini

More Related