Which of the following must occur before a client station operating in a DCF 802.11 network can transmit a frame over the wireless medium?
A. The NAV must be equal to zero.
B. The access point must send a CF-End frame.
C. PIFS expiration must occur.
D. The Backoff timer must expire.
E. DIFS expiration must occur.
F. The client station's carrier-sense mechanism must have determined that the medium is idle.
G. The station must receive a CF-Poll frame from the access point.
正解:A,D,E,F
質問 2:
Given the displayed wireless protocol analyzer trace, which of the following is true?
A. Both 00:40:96:A1:9A:F9 and 00:0D:ED:A5:4F:70 are operating in Ad Hoc mode using WPA-compliant 802.1X/EAP authentication.
B. FF:FF:FF:FF:FF:FF is the access point, and data encrypted with static WEP is being sent from a wired station to the wireless station 00:40:96:A1:9A:F9.
C. 00:40:96:A1:9A:F9 is a station sending encrypted broadcast data using an encryption key generated by the authenticator.
D. 00:40:96:A1:9A:F9 is a client station performing a successful 802.1X/EAP reauthentication.
E. 00:0D:ED:A5:4F:70 is a client station sending unicast data frames to a network node on the wired LAN.
正解:C
質問 3:
Using the wireless LAN protocol analyzer's frame decode shown as a reference, which of the following access point data rate configuration settings must be correct?
A. Basic: None - Supported: 11, 5.5, 2, 1 Mbps
B. Basic: 11, 5.5, 2 Mbps - Supported 1 Mbps
C. Basic: 11 Mbps - Supported: 5.5, 2, 1 Mbps
D. Basic: 11, 5.5 Mbps - Disabled: 2, 1 Mbps
E. Basic: 2, 1 Mbps - Supported: 11, 5.5 Mbps
正解:D
質問 4:
Which of the following is true regarding frame acknowledgement in an 802.11 wireless LAN?
A. In PCF mode, WEP-Data frames are only acknowledged by client stations, never by access points.
B. A client station reassociation request frames are only acknowledged with a reassociation response from the access point when roaming in a wireless LAN secured with 802.1X/EAP.
C. ACK frames following Data fragments set the NAV of competing stations for a duration equal to two SIFS plus the next Data fragment and its ACK.
D. Probe request acknowledgement (sending of a probe response) is configurable in the access point and is always linked to SSID broadcast configuration in Beacons.
E. Beacon frames are acknowledged by all client stations configured for PCF mode.
F. Frame fragments are acknowledged individually (with an ACK frame)
正解:C,F
質問 5:
Given the screenshot shown, choose the statement that accurately describes what is being seen by this protocol analyzer.
A. One wireless station sent an Echo Request (PING) to another wireless station through an access point.
B. The Duration field value's 164 microseconds is sufficient to reserve the RF medium for only the following frames: SIFS, ACK.
C. The BSSID has been randomly generated.
D. Bits (0-14) of the Duration/ID field in this frame indicates the AID of the source station
正解:C
質問 6:
When an access point sends an RTS frame, the duration field will contain an amount of time, measured in microseconds, equal to which of the following?
A. 1 DATA, 1 RTS, 2 SIFS, 1 DIFS, 1 ACK
B. 1 ACK, 1 CTS, 1 DATA, 3 SIFS
C. 2 ACK, 1 RTS, 1 DATA, 4 SIFS
D. 1 RTS, 1 CTS, 1 DATA, 2 ACK, 4 SIFS
正解:B
質問 7:
What are the primary mechanisms used by an 802.11 BSS during a contention-free period to cause stations that are not the Point Coordinator to defer?
A. CF Parameter Set elements in the Beacons
B. Null Function data frames using SIFS
C. The Pseudorandom Backoff Timer in each station
D. All frames transmitted during the CFP have a Duration field value of 32,768
E. Contention-Free Polling List broadcasts
F. Point Coordination Function Interframe Space (PIFS)
正解:A,F
質問 8:
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 capture traffic on more channels simultaneously due to decreased overhead per channel.
B. Analyzers with a small amount of frame buffer memory can be used.
C. Analyzers can be left running for long periods of time without running out of frame buffer space.
D. Capturing, analyzing, and discarding headers allows more CPU cycles for real-time decoding and analysis.
E. Analyzers can use DRAM to store captured frames instead of storing files on a hard drive.
正解:B,C
山瀬** -
ゼロから丁寧に解説されていて解りやすい。この1冊に詰まっています。PW0-205合格に必要な力を手に入れました。