You are administering a network with wireless LAN components for .com. The wireless portion of the network is configured using statically assigned WEP keys stored on each station's wireless PC Card. It has been reported to you that one of the wireless client computers containing a wireless PC Card has been stolen. What reasonable actions could be taken to restore the wireless LAN to the former level of security? Select two.
Answer(s): B,D
Before going into a low-power state (sleep), what function must a wireless station operating in a BSS perform?
Answer(s): A
When using PSP mode in a BSS, stations first send a frame to the access point to inform theaccess point that they are going to sleep, (temporarily powering down). The access pointthen records the sleeping stations as asleep. The access point buffers any frames that are intended for the sleeping stations. Traffic for those clients who are asleep continues arriving at the access point, but the access point cannot send traffic to a sleeping client. Therefore, packets get queued in a buffer marked for the sleeping client.
If two DSSS access points are placed on the same channel in the same physical space, which of the following results will occur? Select three.
Answer(s): B,C,E
Co-channel interference results from two APs transmitting on the same channel in the same area. In a typical 802.11 wireless network, APs continually broadcast a signal, and any wireless client within range can lock onto that signal to make a connection. But when APs are placed close enough together to provide continuous coverage over a large area, it's possible (or even likely) that some APs will generate signals that interfere with other APs. When this happens, two or more APs transmit packets at the same time on the same channel, corrupting packets and causing clients to experience transmission delays and lower performance. In addition, clients located equidistant between two APs on the same channel may flip-flop, not knowing whether to access one or the other.
http://wirelessreview.com/infrastructure/technology/wlan_power_architecture_041105/
Speeds of up to Mbps are allowed within the IEEE 802.11a standard.
Answer(s): B
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