» Traffic Flow and AP

By | September 24, 2012

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Here you will find answers to Traffic Flow and AP QuestionsAccording to the IEEE 802.11 standard


Question 1

What two statements about beacon frames used by access points are true? (Choose two)

A. contains SSIDs if this feature is enabled
B. provides vendor proprietary information
C. is another name for an associated request
D. sent in response to a probe frame
E. includes ATIM window information for power save operations

 

Answer: A B

Explanation

Prior to authentication/association, devices must identify any access-points that are within range. Two methods of scanning are available; namely, passive and active. In passive scanning mode, a device monitors each channel for beacon frames that are broadcast by the access-points in the vicinity.

A beacon frame is a management frame in IEEE 802.11-based wireless LANs. It contains all the information about the network. Beacon frames are transmitted periodically to announce the presence of a wireless LAN network and are transmitted by the Access Point (AP). A beacon frame includes timestamp, beacon interval, its capabilities, SSIDs, supported rates,  TIM (Traffic Indication Map) and some configuration and security information to the client devices. Some of them are standard; other are vendor proprietary. Below shows a beacon frame with “Cisco Proprietary” parameters from the Cisco AP:

Cisco_Beacon_Frame.jpg

(Note: beacon interval is the time interval between two consecutive beacon frames)

Question 2

In general, what is the difference in transmit power between an AP operating at Tx Power Level 1 and the same AP operating at Tx Power Level 3?

A. 2 dB
B. 3 dB
C. 6 dB
D. 11 dB
E. 17 dB

 

Answer: C

Explanation

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Question 3

Which interface is considered a dynamic interface?

A. the virtual interface
B. the AP manager interface
C. the LAG interface
D. the management interface
E. the service port interface
F. a WLAN client data interface

 

Answer: F

Explanation

Each interface performs specific roles within the unified wireless environment. The static interfaces perform system roles, while the dynamic interfaces are user-defined, and provide client connectivity. Therefore a WLAN client data interface is considered a dynamic interface.

Question 4

An indoor 1240 AP is booting and has obtained an IP address using DHCP. The AP has confirmed prior controller IP addresses from a previously joined mobility group stored in NVRAM. What is the next step the AP performs?

A. DHCP option 43.
B. DNS resolution of CISCO-LWAPP-CONTROLLER.localdomain.
C. Layer 2 LWAPP discovery broadcast.
D. Layer 3 LWAPP discovery broadcast.
E. Ping each Cisco WLC to verify its current status.
F. Select a Cisco WLC based on its position in the configured join selection sequence.

 

Answer: A

Explanation

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Question 5

Which AP to Wireless LAN Controller discovery process requires a previous association of the AP with a Cisco WLC?

A. AP priming
B. defining a master controller
C. DHCP Option 6
D. DHCP Option 43
E. over-the-air provisioning

 

Answer: A

Explanation

AP priming happens after an AP is associated with at least one controller. The AP then gets a list of other controllers that it can associate with from the one it is already associated with. These other controllers are part of a mobility group. This information then gets stored in NVRAM and can be used if the AP reboots. To contact these controllers, the AP sends a broadcast to the primary controller and all the other controllers in the group.

Question 6

Which of the following methods is NOT used to access an AP in autonomous mode?

A. Browse
B. Telnet
C. Auxiliary
D. Console

 

Answer: C

Explanation

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