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CWNP CWAP-404 Practice Test - Questions Answers, Page 5
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Question 41
Which one of the following is not an 802.11 Management frame?
Explanation:
A PS-Poll (Power Save Poll) frame is not an 802.11 management frame. A PS-Poll frame is a type of control frame that is used by a STA in power save mode to request data frames from an AP. A STA in power save mode can conserve battery power by periodically sleeping and waking up. When a STA sleeps, it cannot receive any data frames from the AP, so it informs the AP of its power save status by setting a bit in its MAC header. The AP then buffers any data frames destined for the sleeping STA until it wakes up. When a STA wakes up, it sends a PS-Poll frame to the AP, indicating its association ID and requesting any buffered data frames. The AP then responds with one or more data frames, followed by an ACK or BA frame from the STA. The other options are not correct, as they are types of 802.11 management frames. An Action frame is used to perform various management actions, such as spectrum management, QoS management, radio measurement, etc. A Beacon frame is used to advertise the presence and capabilities of an AP or BSS. An Authentication frame is used to establish or terminate an authentication relationship between a STA and an AP.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 6: 802.11 Frame Exchanges, page 169-170
Question 42
What is the difference between a Data frame and a QoS-Data frame?
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Question 43
Which one of the statements regarding the Frame Control field in an 802.11 MAC header is true?
Question 44
How is the length of an AIFS calculated?
Question 45
What is an AIFS?
Question 46
When performing protocol analysis, you notice a high number of RTS/CTS frames being transmitted on an HT network. You suspect this may be due to HT protection mechanisms. Where in the Beacon frame would you look to determine which one of the four HT protection modes the AP is operating in?
Question 47
Where, in a protocol analyzer, would you find an indication that a frame was transmitted as part of an A-MPDU?
Question 48
How many frames make up the Group Key Handshake excluding any Ack frames that may be required?
Question 49
Which one of the following statements is not true concerning DTIMs?
Question 50
Which one of the following is not a valid acknowledgement frame?
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