QUESTION: 77

Which of the following are mechanisms defines by 802.11b for providing access control and privacy on a wireless LAN? (Choose two)

RADIUS
WEP
AES
SSID

Answer(s): B,D

Explanation:

REF FOR B //
Open System authentication is a very simple process. As the wireless LAN administrator, you have the option of using WEP (wired equivalent privacy) encryption with Open System authentication. If WEP is used with the Open System authentication process, there is still no verification of the WEP key on each side of the connection during authentication. Rather, the WEP key is used only for encrypting data once the client is authenticated and associated.
REF FOR D//: The service set identifier (SSID) is a unique, case sensitive, alphanumeric value from 2-32 characters long used by wireless LANs as a network name. This naming handle is used for segmenting networks, as a rudimentary security measure, and in the process of joining a network. The SSID value is sent in beacons, probe requests, probe responses, and other types of frames. A client station must be configured for the correct SSID in order to join a network. The administrator configures the SSID (sometimes called the ESSID) in each access point.Some stations have the ability to use any SSID value instead of only one manually specified by the administrator. If clients are to roam seamlessly among a group of access points, the clients and all access points must be configured with matching SSIDs. The most important point about an SSID is that it must match EXACTLY between access points and clients.

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QUESTION: 78

Which item(s) would NOT be beneficial for a network manager to provide to an engineer doing an indoor site survey?

Blueprints of the facility.
Available lifts for mounting access points.
Access to network backbone routers.
A list of RF systems already in use in the facility.
Diagram of available AC power.
Previous site survey reports.

Answer(s): B

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QUESTION: 79

Prior to August 31, 2000, the FCC required the use of how many channels with a 2.4 GHz FHSS system before repeating the pattern?

Answer(s): B

Explanation:

No overlapping frequencies are allowed under either rule. If the minimum 75 MHz of used bandwidth within the frequency spectrum were cut into pieces as wide as the carrier frequency bandwidth in use, they would have to sit side-by-side throughout the spectrum with no overlap. This regulation translates into 75 non-overlapping carrier frequencies under the pre- 8/31/00 rules and 15-74 non-overlapping carrier frequencies under the post- 8/31/00 rules.
The IEEE states in the 802.11 standard that FHSS systems will have at least 6 MHz of carrier frequency separation between hops. Therefore, a FHSS system transmitting on 2.410 GHz must hop to at least 2.404 if decreasing in frequency or 2.416 if increasing in frequency. This requirement was left unchanged by the IEEE after the FCC change on 8/31/00.

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QUESTION: 80

After August 31, 2000, the FCC allowed a maximum channel
bandwidth for FHSS of?

1 MHz
2 MHz
5 MHz
11 MHz

Answer(s): C

Explanation:

Certified Wireless Network Administrator Study Guide, page 54

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QUESTION: 79

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QUESTION: 80

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