The 802.11a standard specifies what number of non-overlapping channels across all 5 GHz UNII bands combined?
Answer(s): B
According to the study guide, each of the 3 bands in the 5 GHz UNII band (lower, middle, upper) contain 4 non-overlapping channels. The question ask the number of such channels "combined". That would be B (12)
HomeRF is more secure than 802.11b because?
Answer(s): A
Certified Wireless Network Administrator Study Guide, page 164
Which of the following questions is important to ask BEFORE performing an RF site survey?
Answer(s): A,C
Certified Wireless Network Administrator Study Guide, page 311
In relation to the 802.11 series of standards, which of the following best describes Direct Sequence Spread Spectrum (DSSS)? Select two.
Answer(s): A,B
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.There are two kinds of scanning: passive scanning and active scanning. In finding an access point, client stations follow a trail of breadcrumbs left by the access point. These breadcrumbs are called service set identifiers (SSID) and beacons. These tools serve as a means for a client station to find any and all access points.
Which if these will be the most susceptible to multipathinterference?
Answer(s): C
DSSS is the most susceptible to multipath interference, also as transmission rates frames are less resistant to corruption.See http://www.wi-fiplanet.com/tutorials/article.php/1121691 For Explanation as to why DSSS is most susceptible.See CWNA Official Study Guide, 3rd Edition, Page 389For Explanation as to Dynamic Rate Selection
Which of the following are true of FHSS?
After 8/31/00, which of the following are true of FHSS?
What is the maximum transmitter output allowed by the FCC for radio transmitters utilizing FHSS technology (>50 hopping channels) in any of the ISM bands?
Answer(s): E
According to the study guide, in pre-08/31/00 rules, the maximum tranmitter output was 1 watt. However, in post-08/31/00 rules, the transmitter output was reduced to 125 mW, for all systems utilizing fewer than 75 hops in a sequence. Since the question asks for output for >50 hops, then I presume the answer should be 125 mW.
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q252: dns poisoning is the correct answer, not locator redirection. beaconing is detected from a host. this indicates that the system has been infected with malware, which could be the source of local dns poisoning. location redirection works by either embedding the redirection in the original websites code or having a user click on a url that has an embedded redirect. since users at a different office are not getting redirected, it isnt an embedded redirection on the original website and since the user is manually typing in the url and not clicking a link, it isnt a modified link.
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