When a wireless LAN is operating in AD HOC mode, what must occur for traffic to be transmitted outside of the peer-to-peer environment?
Answer(s): A
Page 265 CWNA Study Guide 2nd edition
In an 802.11 wireless network, how is the WEP initialization vector (IV) transmitted?
When WEP is referred to as being simple, it means that it is weak. The RC4 algorithm was inappropriately implemented in WEP, yielding a less-than-adequate security solution for 802.11 networks. Both 64-bit and 128-bit WEP (the two available types) have the same weak implementation of a 24-bit Initialization Vector (IV) and use the same flawed process of encryption. The flawed process is that most implementations of WEP initializehardware using an IV of 0 - thereafter incrementing the IV by 1 for each packet sent. For a busy network, statistical analysis shows that all possible IVs (224) would be exhausted in half a day, meaning the IV would be reinitialized starting at zero at least once a day. This scenario creates an open door for determined hackers. When WEP is used, the IV is transmitted in the clear with each encrypted packet.
CWNA official Study Guide, Pg. 288
Outdoor spread spectrum wireless LANs are NOT affected by what weather condition?
Answer(s): C
Choice B is wrong because A strong wind could easily move one or both antennas enough to completely degrade the signal between the two antennas. This effect is called "antenna wind loading" Choice A and D are wrong because Severely adverse weather conditions can affect the performance of a wireless LAN. In general, common weather occurrences like rain, hail, snow, or fog do not have an adverse affect on wireless LANs. However, extreme occurrences of wind, fog, and perhaps smog can cause degradation or even downtime of your wireless LAN.
CWNA official Study Guide, Pg. 244
Which of the following could be considered as part of a wireless LAN security solution?
Answer(s): D
Wired Equivalent Privacy (WEP) is an encryption algorithm used by the Shared Key authentication process for authenticating users and for encrypting data payloads over only the wireless segment of the LAN. The IEEE 802.11 standard specifies the use of WEP.
CWNA official Study Guide, Pg. 260
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