By default, what type of authentication is used by IEEE 802.11 devices?
Answer(s): B
Open System authentication is a method of null authentication and is specified by the IEEE 802.11 as the default setting in wireless LAN equipment. Using this method of authentication, a station can associate with any access point that uses Open System authentication based only on having the right service set identifier (SSID).
CWNA Official Study Guide, Page 174
Which of the following factors must be considered whenever encryption and authentication are to be implemented in any system?
Answer(s): A
Which of the following types of antennas can be used for Antenna Diversity?
Answer(s): A,B
Omni-directional/Dipole antennas are the most appropriate for use in antenna diversity situations.
802.11b DSSS performance is negatively affected by which of the following factors? (Select three.)
Answer(s): B,C,D
From the study guide, 802.11b DSSS is affected by the negative effects of Multipath and all-band intereference (in this case, a co-located Bluetooth device). Although Near/far is a performance problem for a remote client station, it does not necessarily have a negative impact on the Wireless LAN as a whole.
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