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51.
Which one of the following is used to uniquely identify an AP and the basic service
set it maintains with its associated wireless clients?
- A.SSID
- B.BSSID
- C.Ethernet MAC address
- D.Radio MAC address
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The AP at the heart of a BSS or cell identifies itself (and the BSS) with a basic service set identifier (BSSID). It also uses an SSID to identify the wireless network, but that is not unique to the AP or BSS. Finally, the radio MAC address is used as the basis for the BSSID value, but the value can be altered to form the BSSID for each SSID that the AP supports. |
52.
Which one of the following statements is true about a wireless BSS?
- A.A wireless client can send frames directly to any another client at any time.
- B.Once two clients are associated to the BSS, they may communicate directly with each other with no further intervention.
- C.A client must send frames through the AP only when the destination client is associated to a different AP.
- D.A client must send all frames through the AP to reach any other client or coordinate with the AP to reach another client directly.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| In a BSS, the 802.11 standard requires all traffic to pass through an AP. The only exception is the 802.11z amendment, which permits an AP to coordinate direct client-to-client traffic without passing through the AP. |
53.
ExIn a Cisco wireless network, which of the following statements full of acronyms are
correct? (Choose two.)
- A.The DS connects two BSSs to form an ESS..
- B.The BSA of a BSS looks like a MAC address.
- C.The SSID of a STA must be unique within the ESS.
- D.The BSSID is unique for each SSID in a BSS.
- Answer & Explanation
- Report
Answer : [A and D]
Explanation :
Explanation :
|
A. True: “The DS connects two BSSs to form an ESS”—The distribution system
connects two basic service sets (APs) to form an extended service set. B. False: “The BSA of a BSS looks like a MAC address”—The basic service area of a BSS is its coverage area or cell, which has nothing to do with a MAC address. C. False: “The SSID of a STA must be unique within the ESS”—The service set identifier can be common across one or many BSSs in an ESS. D. True: “The BSSID is unique for each SSID in a BSS”—An AP in a BSS uses its radio MAC address as the basis for its BSSIDs, but each SSID has a unique BSSID value. |
54.
A wireless client is configured to associate with the wireless network called
BeMyGuest. For the client to roam successfully everywhere within a building, which
one of the following correctly identifies the WLAN topology that must be in place?
- A.A basic service set
- B.A distribution system
- C.An extended service set
- D.The SSID BeMyGuest defined on every AP
- E.All of these answers are correct.
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| Roaming implies that the building has some wireless APs that are interconnected. Therefore, the client must first associate with a BSS. The BSS must connect to a Wirelessed infrastructure through a DS. The DS must extend to at least one more AP through an ESS. Finally, the same SSID has to be defined on every AP in the ESS. |
55.
Which one of the following is also known as an ad hoc wireless network?
- A.DS
- B.ESS
- C.BSA
- D.IBSS
- E.BSS
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| An independent basic service set is also called an ad hoc network. |
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