Which of the following features assist in the reduction of lost data due to wireless LAN PC Cards (Clients) entering sleep mode while operating in AD HOC mode? Select two.
Answer(s): C,D
Announcement Traffic Information Message (ATIM) - used in Ad Hoc mode toindicate to stations the presence of transmissions bound for a particular station; tells stations not to enter sleep mode before receiving their transmitted frames An ATIM is used for the purpose of notifying stations that are using power save poll (PSP) mode that there is data queued for them by other stations, awaiting delivery. After stations send the ATIMs to other stations, the ATIM window (the time during which ATIMs are sent) closes and the data is then delivered according to CSMA/CA medium access rules.Incorrect answers:In ad-hoc mode there is no AP and this fact eliminates A and B as answers See page 358 CWNA Study Guide 3rd edition
Which of the following is the shortest Interframe Space?
Answer(s): B
Refer to the diagram:
What action occurs when a wireless station drops its speed due to Automatic Rate Selection?
What term identifies the bending of an RF signal when it passes through a medium with different density?
Which of the following items is NOT necessary to document as part of a long-distance RF path survey?
Answer(s): E
There are many outdoor interference sources, and some can change just by their nature.Seek out and record the effects of the following:1. Trees, buildings, lakes, or other obstructions or reflective objects2. Trees without leaves that will later have leaves or that will grow to interfere with the Fresnel zone.3. Automobile traffic - if linking two buildings at first-story height across a road, a large truck or bus could disable the link.Record the interference source, its location, and its effect and potential effect on wireless LAN coverage, range, and throughput. This data should be recorded both on your copy of the blueprint as well as in a separate list for easy future reference. Taking pictures of interference sources that are permanent (e.g., lakes and buildings) will serve as a visual reference to the client.
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