- Home
- Networking
- CCNA Wireless
61.
To access a wireless channel, 802.11 devices participate in which one of the
following?
- A.DCF
- B.GCF
- C.LCM
- D.BSD
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| 802.11 devices can participate in the distributed coordination function (DCF). |
62.
A wireless client maintains a NAV value that is used for which one of the following
purposes?
- A.To navigate the frame through the ESS
- B.To identify the MAC address of the next client to transmit
- C.To predict when the channel might become free
- D.To set the priority of the client’s ability to transmit
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| A wireless client uses the network allocation vector (NAV) to predict the number of timeslots required for the channel to become free so that a frame can be transmitted. |
63.
Which one of the following specifies the default amount of time between successive
802.11 data frames?
- A.CCA
- B.IBSS
- C.SIFS
- D.DIFS
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Frames are separated by the distributed interframe space (DIFS). |
64.
Which one of the following is the frame type sent to discover APs within the signal
range of a wireless client?
- A.Scan
- B.Probe
- C.Beacon
- D.Discovery
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| A probe request frame is sent to ask any listening APs to identify themselves. |
65.
An ACK frame is an example of which one of the following 802.11 frame types?
- A.Management
- B.Control
- C.Administration
- D.Data
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| A wireless device must send an ACK frame, one of the 802.11 control frames, back to the source of each unicast frame that is received. |
|
|
||||||||||||||||||||||||||||
