QUESTION: 359

Which of the following effects will result from installing an extension cable to an antenna in a wireless LAN? Select all that apply.

The area covered by the antenna will decrease.
The Equivalent Isotropically Radiated Power (EIRP) will decrease.
The data throughput rate will increase.
The RF signal power at the antenna input will increase.
802.11 frames must be fragmented further resulting in lost throughput.

Answer(s): A,B

Reference:

CWNA Offcial Study Guide, 3rd Edition, Pages 141-142 (RF Attenuators)

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QUESTION: 360

Which of the following functions require scanning functions in a wireless LAN? Select all that apply.

Finding and joining a new infrastructure network.
Finding a new access point while roaming.
Finding and joining a new ad hoc network.
Wireless multicasting
Authentication to an access point.
Use of the 802.1x/EAP authentication process.

Answer(s): A,B,C

Explanation:

Scanning functions involves three types of frames: beacons, probe requests, and probe responses. See CWNA Official Study Guide, 3rd Edition, Page 333 (Locating a Wireless LAN)
Stations send a probe request when they are actively seeking a new network to join. See CWNA Official Study Guide, 3rd Edition, Page 336 (Active Scanning)

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QUESTION: 361

Direct Sequence Spread Spectrum (DSSS) systems use _ MHz wide carrier frequencies to transmit data.

Answer(s): A

Explanation:

The frequency hopping physical layer has 22 hop patterns to chose from. The frequency hopping physical layer is required to hop across the 2.4GHz ISM band covering 79 channels. Each channel occupies 1Mhz of bandwidth and must hop at the minimum rate specified by the regulatory bodies of the intended country. A minimum hop rate of 2.5 hops per second is specified for the United States.
The DSSS physical layer uses an 11-bit Barker Sequence to spread the data before it is transmitted.
See pg 76 in CWNA User Guide 2nd edition.

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