1. Wireless Networking Wireless Devices Module-4B Jerry Bernardini Community College of Rhode Island 6/13/20151Wireless Networking J. Bernardini

2. Presentation Reference Material CWNA Certified Wireless Network Administration Official Study Guide (PWO-104), David Coleman, David Westcott, 2009, Chapter-10 6/13/2015Wireless Networking J. Bernardini2

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 6/13/2015Wireless Networking J. Bernardini3

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. Cisco Aironet 802.11a Client Adapter 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

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 CF to PC SD to USB SD 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. 6/13/2015Wireless Networking J. Bernardini15

16. Autonomous AP Implementation 6/13/2015Wireless Networking J. Bernardini16

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.. 6/13/2015Wireless Networking J. Bernardini17

18. Thin Access Points Implementation 6/13/2015Wireless Networking J. Bernardini18

19. Access Points Market 6/13/2015Wireless Networking J. Bernardini19 Cisco APs Linksys APs Buffalo APs Belkin APs

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 6/13/2015Wireless Networking J. Bernardini20

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 6/13/2015Wireless Networking J. Bernardini21

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

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 Point-to-Mulitpoint Non-Root Root Non-Root

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 Cisco Aironet 1400 3Com WLAN Bridge Proxim Quick Bridge 11

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

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 6/13/2015Wireless Networking J. Bernardini26

27. Enterprise WLAN 6/13/2015Wireless Networking J. Bernardini27

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 Controller BSC 2100

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

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 6/13/2015Wireless Networking J. Bernardini30

31. Wireless Mesh Network Implementation 6/13/2015Wireless Networking J. Bernardini31

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 6/13/2015Wireless Networking J. Bernardini32 Linksys Siemens