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Wireless LANclients and

Access points

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Wlan Radios

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Clients utilities

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Enterprise-class client utilities

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Access points

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Wireless LANTopologies

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Wireless LAN Topologies

• Wireless client access

 – Mobile user connectivity

• Wireless bridging

 –

LAN-to-LANconnectivity

• Wireless mesh networking

 – Combination of bridging

and user connectivity

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WLAN and LAN

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Service Set Identifier (SSID)

• SSID is used to logicallyseparate WLANs.

• The SSID must match onclient and access point.

• Access point canbroadcast SSID in beacon.

• Client can be configuredwithout SSID.

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Steps to Association:

AP A Confirms Associationand Registers Client

Client Sends Probe

AP Sends Probe Response

Client Evaluates AP

Response, Selects Best AP

Client Sends AuthenticationRequest to Selected AP (A)

AP A Confirms Authenticationand Registers Client

Client Sends AssociationRequest to Selected AP (A)

Association Process (ActiveScanning)

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WLAN Access Topology

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Wireless Repeater Topology

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Workgroup Bridge Topology 

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Alternative Peer-to-PeerTopology

Peer-to-Peer Configuration(Ad Hoc Mode)

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Service Sets & Modes• Ad hoc mode

 – Independent Basic Service Set(IBSS)

• Mobile clients connectdirectly without anintermediate AP.

•

Infrastructure mode – Basic Service Set (BSS)

• Mobile clients use a singleAP for connecting to eachother or to wired networkresources.

 – Extended Services Set (ESS)• Two or more Basic Service

Sets are connected by acommon distribution system(DS).

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Wireless network management systems 

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WLAN controllers

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WLAN Controller: Core

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WLAN controller:Distribution

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WLAN controller:Access

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Wireless Residential Gateways

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Wireless VPN routersProvides VPN tunnels

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Entreprise Encryption Gateways (EEG)

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WLAN Arrays

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Location Tracking

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Evolution of WLAN Architecture

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Evolution of Wlan architecture:Multi-channelArchitecture (MCA)

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Evolution of Wlan architecture:Single-channel Architecture (SCA)

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Wireless mesh networks