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802.11b/g/a 802.11b/g/a

Wireless Technology DevicesWireless Technology Devices

Using 802.11x Gear in HSMMUsing 802.11x Gear in HSMM

Jeff Fant, N5OLF, CWNA, CCAI, CCNA

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Types of Wireless NetworksTypes of Wireless Networks

• Ad HocAd Hoc– PC to PC with no Access PointPC to PC with no Access Point– IBSSIBSS

• InfrastructureInfrastructure– All PCs communicate with each other through All PCs communicate with each other through

a common Access Point(s)a common Access Point(s)– BSSBSS– EBSS EBSS

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Infrastructure NetworksInfrastructure Networks

• Basic Service SetBasic Service Set– Only on Access PointOnly on Access Point– Usually connects network to the InternetUsually connects network to the Internet

• Extended Service SetExtended Service Set– More than one Access PointMore than one Access Point– Wired connectivity between Access PointsWired connectivity between Access Points– Usually connectivity to the Internet is through Usually connectivity to the Internet is through

the wired network the wired network

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Types of Wireless DevicesTypes of Wireless Devices

• Wireless GatewaysWireless Gateways

• Wireless RoutersWireless Routers

• Wireless Access PointsWireless Access Points

• Wireless BridgesWireless Bridges

• Wireless Workgroup BridgesWireless Workgroup Bridges

• Wireless ClientsWireless Clients

Usually found in the same deviceUsually found in the same device

Bridges are an upgrade to an Access PointBridges are an upgrade to an Access Point

ClientsClients

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Wireless Gateways & RoutersWireless Gateways & Routers

• Wireless Gateway Wireless Gateway (Default)– Runs PPPoE out to an ISPRuns PPPoE out to an ISP– Router is the edge routerRouter is the edge router

• Wireless RouterWireless Router– Runs RIP1 or RIP2Runs RIP1 or RIP2– Router is within the network, but not the Router is within the network, but not the

boundary router boundary router

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Wireless GatewaysWireless Gateways

InternetInternetISPISP

Network #1Network #1

Network #2Network #2

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Wireless RouterWireless Router

InternetInternetISPISP

Wired Gateway RouterWired Gateway Router

Network #1Network #1

Network #2Network #2

Network #3Network #3

Network #4Network #4

Network #5Network #5

Wireless RoutersWireless Routers

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Wireless ClientsWireless Clients

• PCI Interface CardPCI Interface Card– DesktopsDesktops

• USB CardsUSB Cards– Desktops, Laptops & NotebooksDesktops, Laptops & Notebooks

• PCMCIA Insertion CardsPCMCIA Insertion Cards– Laptops & NotebooksLaptops & Notebooks

• Build-in ChipsetBuild-in Chipset– NotebooksNotebooks

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PCI, PCMCIA & USBPCI, PCMCIA & USB

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Wireless Access PointsWireless Access Points

• Access Point does not route traffic Access Point does not route traffic between networksbetween networks

• It only performs the function of a portalIt only performs the function of a portal– Ethernet uses 802.3 framesEthernet uses 802.3 frames

• Maximum size 1518 is bytesMaximum size 1518 is bytes

– Wireless uses 802.11 framesWireless uses 802.11 frames• Maximum size 2346 is bytesMaximum size 2346 is bytes

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Access PointsAccess Points

All wireless clients can beAll wireless clients can beon the same IP network.on the same IP network.

AP #1AP #1 AP #2AP #2 AP #3AP #3

Client Roaming is PossibleClient Roaming is Possible

Wired RouterWired Router

Network #1Network #1

Network #2Network #2

Channel #1 Channel #6 Channel #11

SSID: REDREDSSID: REDRED

SSID: REDRED

About 20% to 30% of Cell overlap required for roaming

Ethernet 802.3Ethernet 802.3

Wireless 802.11Wireless 802.11