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66.
A wireless AP advertises mandatory data rates of 1, 2, 5.5, and 11 Mbps. Which of
the following represent client data rates that can successfully join the BSS? (Choose
all that apply.)
- A.Mandatory: 1 Mbps, Supported: 2, 5.5, 11 Mbps
- B.Mandatory: 2 Mbps, Supported: 1, 5.5, 11 Mbps
- C.Mandatory: 1 Mbps, Supported: None
- D.Mandatory: 5, 11 Mbps; Supported: None
- Answer & Explanation
- Report
Answer : [A , B]
Explanation :
Explanation :
| A client can join a basic service set (BSS) as long as it has at least one mandatory rate in common with the AP and supports all of the AP’s mandatory rates. |
67.
In a passive scan, a wireless client uses which one of the following methods to discover nearby APs?
- A.Beacons
- B.Probe requests
- C.ACKs
- D.Discovers
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| In a passive scan, a client simply listens to any beacons that are transmitted by nearby APs. In contrast, probes are sent by the client to discover APs in an active scan. |
68.
When a client attempts to join a BSS, which one of the following frame types is sent
first?
- A.Beacon
- B.Rate request
- C.Association request
- D.Authentication request
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| A client must first be authenticated to the BSS before it can request to be associated. |
69.
Which one of the following frame types does a client use to roam seamlessly from
one BSS to another, within the same ESS and the same SSID?
- A.Association request
- B.Disassociation
- C.Reassociation
- D.Roam request
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| As long as the client can move from one BSS to another without losing a signal or getting disassociated or deauthenticated, it can probe for a new AP and send a reassociation frame to reassociate itself with the existing SSID. |
70.
Which of the following parameters can be adjusted on an AP to change the size of its
cell or BSA? (Choose all that apply.)
- A.Channel number within a band
- B.Transmit power
- C.Supported modulation and coding schemes
- D.Supported data rates
- Answer & Explanation
- Report
Answer : [B, C and D]
Explanation :
Explanation :
| The transmit power directly affects the range of the AP’s signal. The supported modulation and coding schemes can affect the range because the simpler schemes can tolerate a lower SNR and a weaker signal, implying a greater range. The more complex schemes offer better data rates, but need a better signal quality within a shorter range. The supported data rates also affect the range because they directly affect the modulation and coding schemes that are used. |
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