4) CWNPCert: Wireless LAN Administration

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Objective: 802.11 Network Implementation
SubObjective: 802.11 Network Design, Implementation, and Management

 

Single Answer Multiple Choice

 

You must design the layout of a WLAN installation for a summer computer camp for children. The camp has a central facility where all the servers and the connection to the Internet are located. The outlying buildings, where the campers sleep, are in a circle around the main building ranging from 100 yards to 200 yards away. The following requirements have been set:

 

 

  • Requirement A: Each building should receive an equal strength signal despite their varying distances.
  • Requirement B: The signal should be kept from transmitting to areas where there are no buildings.
  • Requirement C: You must minimize interference from a neighboring 802.11b/g network that appears to be using channel 6.

You take the following actions:

 

  1. Install a sector antenna array on the main building
  2. Install semi- directional antennas on each outlying building
  3. Set the network to use channel 5

Which of the following best describes your satisfaction of the requirements?

A. You satisfied A and B, but not C
B. You satisfied A and C, but not B
C. You satisfied C & B, but not A
D. You satisfied A, B, and C

 

Answer:
A. You satisfied A and B, but not C

 

Tutorial:
Requirements A and B were satisfied by using sector antennas at the main building. These arrays are antennas with a flat propagation pattern that can be set up back to back without interfering with each other. Their signal strength can be set individually thereby eliminating the problem we might experience with an omni antenna of overshooting the closer buildings and transmitting to areas with no buildings. The other part of satisfying A and B was the use of semi directional antennas at the outlying buildings. This also helps to control the propagation of traffic from those buildings to the main building since the transmission will be more focused on its target than if you use omni antennas.

 

Requirement C was not satisfied because the selected channel is too close to the neighboring channel. To satisfy requirement C, you should select channel 1 or 11, or escape the interference entirely by selecting an 802.11a network, which transmits in an entirely different frequency band.

 

Reference:
CWNA Study Guide Revision 3, p. 310.
CWNA Study Guide Revision 3, p. 411.

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