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CWNP Certified wireless analusis professional(cwap) Sample Questions:

1. An 802.11b client station, sends a single 600 byte MSDU to another 802.11b client station while operating as part of an unsecured infrastructure BSS. Due to thresholds set on all client stations and the access point, all MPDUs over 300 bytes in length invoke the RTS/CTS protocol. How many individual CTS frames are transmitted on the wireless medium as part of the entire process of moving the 600 byte MSDU between the two client stations?

A) 3
B) 1
C) 2
D) 4

2. In the analyzer trace shown, the TBTT is nominally 100 Kilomicroseconds. Why does the difference between the time Beacons are sent vary?

A) The access point must compete to gain access to the RF medium in order to transmit a beacon.
B) This trace is taken of an 802.11b/g mixed mode network where both 802.11b and
802.11g nodes are active on the network. The access point is changing slot times from short to long as needed.
C) The DCF Interframe space is nominally 50 , but typically varies by as much as 10 (?0%) causing delays in beacons.
D) Beacon frames vary in size, and therefore some take slightly longer to send than others.

3. XYZ Corporation has an 802.11b/g mixed mode deployment, and they are currently experiencing random throughput problems around the entire network. When the network was originally installed, there were both 802.11b and 802.11g stations on the network, but throughput levels were acceptable at any given time. To troubleshoot this issue, you have deployed a distributed wireless protocol analyzer, and it has noted a significantly greater percentage of 1 Mbps Data traffic being sent in random places across the network as compared with the initial baseline testing. When the network was installed, you considered only a minimal amount of 1 Mbps Data traffic acceptable. What could be causing this problem, and how would the analyzer know about the 1 Mbps traffic?

A) Due to changes in the office environment, some client stations are moving further away from the access points than when the baseline tests were performed. The analyzer views the SIGNAL field in the PLCP header to see the frames transmission rates.
B) A new 802.11g station has a minimum transmission rate set at 1 Mbps. The analyzer views the Start Frame Delimiter (SFD) field in the PLCP header to see the frames?transmission rates.
C) A wireless network management system has updated all access points to allow only use of the long slot time. The analyzer views the SERVICE field in the PLCP header to see the frames?transmission rates.
D) An access point configured for 802.11b/g mixed mode has been reconfigured to send downstream traffic in a round-robin fashion when protection is enabled. The analyzer views the length of the preamble to determine the transmission rate of associated stations.

4. Some protocol analyzers have the ability to capture only MAC frame headers (sometimes called packet slicing), and others have the ability to update the capture display without saving the frames permanently (sometimes called stumbling mode). What are advantages of using these two features of a wireless protocol analyzer?

A) Analyzers can use DRAM to store captured frames instead of storing files on a hard drive.
B) Analyzers can be left running for long periods of time without running out of frame buffer space.
C) Analyzers can capture traffic on more channels simultaneously due to decreased overhead per channel.
D) Capturing, analyzing, and discarding headers allows more CPU cycles for real-time decoding and analysis.
E) Analyzers with a small amount of frame buffer memory can be used.

5. The Timestamp field, found in 802.11 Beacon Management frames, is 8 bytes in length and serves which of the following purposes?

A) Informs associating client stations how often to expect Beacon Management frames to be sent by the access point.
B) Allows client stations in the IBSS to pick the best of multiple beacons.
C) Allows all client stations in a BSS to calculate how long it took for the Beacon Management frame to traverse the wireless medium.
D) Keeps all client stations in a BSS synchronized to within approximately 4 microseconds of the access point.
E) Used to notify client stations using power management features of how long their queued frames have been held by the access point.

Solutions: