What option allows a wireless PC Card to adjust its transmission speed to compensate for the changing nature of the frequency channel?
Answer(s): A
Adaptive (or Automatic) Rate Selection (ARS) and Dynamic Rate Shifting (DRS) are both terms used to describe the method of dynamic speed adjustment on wireless LAN clients. This speed adjustment occurs as distance increases between the client and the access point or as interference increases. It is imperative that a network administrator understands how this function works in orderto plan for network throughput, cell sizes, power outputs of access points and stations, and security.
CWNA Official Study Guide, Page 205
In order to obtain Wi-Fi certification, a manufacturer's OFDM system must adhere to which of the following?
Answer(s): E
802.11g and 802.11a compliant wireless LAN equipment specify use of orthogonal frequency division multiplexing (OFDM), allowing speeds of up to 54 Mbps, which is a significant improvement over the 11 Mbps specified by 802.11b.
CWNA Official Study Guide, Page 215
How is the fragmentation setting configured on a wireless LAN?
Answer(s): B
One way to use fragmentation to improve network throughput in times of heavy packet errors is to monitor the packet error rate on the network and adjust the fragmentation level manually.
Which of the following options is a possible wireless LAN security solution?
Use of PPTP with shared secrets is very simple to implement and provides a reasonable level of security, especially when added to WEP encryption. Use of IPsec with shared secrets or certificates is generally the solution of choice among security professionals in this arena.
CWNA Official Study Guide, Page 276
For which of the following technologies will narrowband RF interference cause significant problems during implementation?
According to the study guide, FHSS systems are more resistent to Narrowband interference then DSSS systems. This is due to the agility of FHSS systems and their utilization of the entire 2.4 Ghz band (83.5 Mhz). Since HomeRF is an FHSS implementation and IrDA does not utilize RF technology
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