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34 Cards in this Set
- Front
- Back
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What is a wireless association?
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A client’s membership with an AP
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What is an autonomous mode AP?
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APs that are independent from the larger network
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What is a BSS?
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Basic Service Set: A set of hosts and APs that can communicate via wireless networking.
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What is an IBSS?
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Independent Basic Service Set: An isolated BSS aka "ad-hoc".
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What is an ESS?
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Extended Service Set: A set of hosts and APs that also connects to the wired network.
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What is a SSID?
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Service Set ID: a text string included in every frame
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What is DCF and what does it do?
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Distributed Coordination Function: Process used by WLANs to determine who gets to send data.
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What is DIFS and what does it do?
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DCF interframe space: time required for a station to wait before retransmitting.
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What is Layer 2 roaming?
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Client maintains the same Layer 3 address between access points.
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What is Layer 3 roaming?
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Client roams between access points located in different IP subnets.
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What is a Lightweight Access Point (LAP)?
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An access point that performs only the 802.11 functions. The management functions are performed on a WLC.
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What is a Wireless LAN Controller (WLC)?
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Performs the management functions for a LAP.
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What is Split-MAC Architecture?
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The division of labor split between LAP and a central WLC.
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Do a LAP and WLC need to be located on the same subnet?
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No
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What two tunnel modes are used by LAPs to connect to WLCs?
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LWAPP
CAP-WAP |
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What is the Lightweight Access Point Protocol (LWAPP)?
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Cisco-proprietary protocol used by LAPs to tunnel to WLCs
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What is the Control and Provisioning Wireless Access Point Protocol (CAP-WAP)?
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Open standards protocol used by LAPs to tunnel to WLCs
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What do the two tunnels run by LWAPP or CAP-WAP carry?
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Control messages & Data
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Are LWAPP/CAP-WAP control messages encrypted?
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Yes
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What protocol and port does LWAPP use (name both)?
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UDP 12222 and UDP 12223
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What protocol and port does CAP-WAP use (name both)?
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UDP 5246 and UDP 5247
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What authentication method is used for the LAPs and WLCs?
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Certificates
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How does a LAP receive its configuration?
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From a WLC it discovers on the network.
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What DHCP option provides a LAP with a list of WLCs?
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Option 43
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What does Hybrid Remote Edge Access Point (HREAP) do?
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Used by remote sites where the LAP is separated from the WLC by a WAN link; allows LAPs to operate even if their connection to the WLC is down
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Where does wireless client traffic travel through to reach another client?
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The AP --> the LWAPP/CAP-WAP data tunnel --> the WLC --> back out the tunnel --> AP --> wireless LAN
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What types of traffic do not travel to the WLC?
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Encrypted and Authenticated traffic.
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What is intra-controller roaming?
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Wireless client roams between different LAPs but is still on the same WLC.
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What is inter-controller roaming?
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Wireless client roams between different LAPs that connect to different WLCs.
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What is a mobility exchange message?
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Info about a roaming client is transmitted between WLCs.
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What is an Ether-IP Tunnel?
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Tunnel created between WLCs to allow a client to roam between LAPs that are on different subnets.
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What IP protocol is used by Ether-IP tunnels?
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IP 97
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What is a Mobility Group?
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Used for inter-controller roaming. It allows clients to roam between LAPs that are managed by different WLCs.
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What network design layer should WLCs be located in?
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Distribution Layer
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