When operating in 802.11b/g mixed mode, the 802.11g standard calls for optional use of two protection mechanisms: RTS/CTS and CTS-to-Self. Which is true regarding use of these two protection mechanisms?

• A. All client stations in a basic service area (BSA) hear RTS, CTS, and CTS-to-Self frames, so either the RTS/CTS mechanism or CTS-to-Self mechanism can be used with equal effectiveness.
• B. RTS and CTS frames use Short Interframe Spaces (SIFS), and CTS-to-Self frames use PCF Interframe Spaces (PIFS).
• C. RTS and CTS frames get relayed through the access point, whereas the CTS-to-Self frames do not.
• D. Use of RTS/CTS introduces more latency than CTS-to-Self due to an increased number of frames introduced into the wireless medium.
• E. A CTS-to-Self frame sent by a client station may reach fewer nodes than the RTS/CTS frame exchange.

ABC Company has hired you to troubleshoot an intermittent performance problem with their 802.11g wireless LAN. They have noticed that intermittently throughout a typical day, their wireless LAN latency increases enough to interrupt some mission critical applications.
ABC demands that you wait until after business hours to begin any troubleshooting that might cause service interruptions to the wireless network. Considering that ABC Company has no baseline analysis, what possible first step do you take toward troubleshooting ABC Company wireless network problem?

• A. Using a protocol analyzer, you search for rogue access points that might be causing interference in the 2.4 GHz ISM band by emitting beacons.
• B. After business hours, you search for wireless clients that are transmitting too many Probe Request frames and temporarily replace them as a troubleshooting measure.
• C. You perform a walk-through of ABC Company's premises during business hours using a protocol analyzer looking for 802.11g Basic Service Sets that have both 802.11b and
  802.11g stations associated. You then compare this information to where the latency is being experienced.
• D. You perform a walk-through of ABC Company premises during business hours using a protocol analyzer looking for data frames with high Retry counts and MAC CRC Error counts.
• E. You install protocol analyzer probes near each access point in order to see if a large percentage of data frames are carrying their maximum payload over the next two days.
• F. After business hours, you enable the traffic generator function of a wireless protocol analyzer in order to simulate various high utilization conditions on the network while testing ABC Company applications.

Which of the following parameters accurately describe the Beacon Interval field in the Beacon Management frame?

• A. Value can range from 1 to 32,768
• B. 4-octet length
• C. Measured in time units of 1 us
• D. Indicates the exact time interval between beacon transmissions
• E. Measured in time units of 1024 us
• F. Indicates the desired time interval between TBTTs

In a DCF 802.11g network, when is the Power Management subfield of the Frame Control field set to a value of 1?

• A. On any frame transmitted by a client station operating in Power Save mode.
• B. Only in management frames sent by a client station immediately prior to entering a low power state (dozing) that are part of a frame exchange sequence.
• C. On any Data frame sent by the access point subsequent to a PS-Poll frame.
• D. Only in the PS-Poll frame sent from a client station operating in Power Save mode to an access point after the client station awakens from a low power state (dozing).

While analyzing a small office wireless network, you notice WEP is in use. In your protocol analyzer, where would you look to view the WEP Initialization Vector (IV) information?

• A. In any MPDU frame body.
• B. In any Data frame Sequence Control field.
• C. In any PPDU header Service field.
• D. In any Data frame Frame Control field.
• E. It is not possible to view the IV information because it is encrypted.