Wireless Networking Wireless Devices Module-7A

Wireless Networking

Wireless Devices Module-7A

Jerry BernardiniCommunity College of Rhode Island

04/22/23 1Wireless Networking J. Bernardini

Presentation Reference Material

• CWNA Certified Wireless Network Administration Official Study Guide

(PWO-104), David Coleman, David Westcott, 2009, Chapter-10

04/22/23 Wireless Networking J. Bernardini 2

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


Cisco Aironet 802.11b Client Adapters

• 2.4 GHz– 802.11b– 11 Mbps

• Include– PC Card – PCI Card– LMC Card– Mini PCI

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)

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

PCMCIA, (PC) Cards

Compact Flash

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

CF Wireless 802.11b (WiFi)

Wireless USB Adapters

PCI and ISA Adapters

Adapters

CF to PC

SD to USB

SD to PC

USB to Serial

Ethernet Adapters

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

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.


Autonomous AP Implementation


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..


Thin Access Points Implementation


Access Points Market


Cisco APsLinksys APs

Buffalo APs

Belkin APs

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


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


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 PointSwitch

PSE Injector

AC Power

PSE Injector

AC PowerDC Power

CAT-5e Ethernet

SwitchAccess Point

Tap/Splitter

DCPower

1

2

3

Pins 4-5 +Power(48v)Pins 7-8 –Power

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

Root

Non-Root

Non-Root

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 14003Com WLAN Bridge Proxim Quick Bridge 11

Bridge Application: School District

LincolnElementaryYagi

BodeElementaryYagi

RichardsonElementaryYagi

PriceElementaryYagi

Dewitt ElementaryYagi

BolichMiddle SchoolYagi

RobertsMiddle SchoolDish

Weaver-Special EducationDish

High School 2 BridgesOne 12 dBi omniOne Dish Administration

2 BridgesOne 12 dBi omniOne Yagi

U N I V E R S I T YU N I V E R S I T Y

Channel #11

Channel #6

Channel #1

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


Enterprise WLAN


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

Enterprise Wireless Gateways

EnterpriseGateway

Internet

Router

AccessPoints

Switch

WirelessClients

EnterpriseServer

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 Mesh Network Implementation


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


LinksysSiemens

Wireless Networking Wireless Devices Module-7A

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