Which of the following frequencies are considered by the FCC to be ISM frequencies? Select three.
Answer(s): B,D,E
What term is used to describe the amount of time spent by a wireless LAN radio transmitting data on a channel in an FHSS system?
Answer(s): B
The frequency of the carrier is periodically modified (hopped) following a specific sequence of frequencies.In FHSS systems, the spreading code is this list of frequencies to be used for the carrier signal, a.k.a. the "hopping sequence"The amount of time spent on each hop is known as dwell time and is typically in the range of 100 ms.
Which of the following statements describe the 802.11 implementation and interoperability of WEP? Select two.
Answer(s): A,C
Pg 381, 382 in CWNA User Guide 2nd edition
Which of the following hardware components may contribute to wireless LAN security?
Answer(s): A
An enterprise wireless gateway is a device that can provide specialized authentication and connectivity for wireless clients. Enterprise wireless gateways are appropriate for large- scale wireless LAN environments providing a multitude of manageable wireless LAN services such as rate limiting, Quality of Service (QoS), and profile management. It is important that an enterprise wireless gateway device needs to have a powerful CPU and fast Ethernet interfaces because it may be supporting many access points, all of which send traffic to and through the enterprise wireless gateway.
CWNA Official Study Guide, Page 122
Which of the following types of antennas are used in wireless LANs? Select two.
Answer(s): A,B
The type of antenna used affects the range either by focusing the RF energy into a tighter beam transmitting it farther (as a parabolic dish antenna does); or by transmitting it in all directions (as an omni-directional antenna does), reducing the range of communication. Semi-directional antennas come in many different styles and shapes. Some semidirectionalantennas types frequently used with wireless LANs are Patch, Panel, and Yagi (pronounced "YAH-gee") antennas. All of these antennas are generally flat and designed for wall mounting. Each type has differentcoverage characteristics. Figure 5.7 shows some examples of semi-directional antennas.
CWNA Official Study Guide, Page 137
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