CWNA-108 Online Practice Questions and Answers

Correct Answer: C

Correct Answer: B

Reference https://books.google.com.pk/books?id=HQxhBgAAQBAJandpg=PA343andlpg=PA343anddq=plane+of+the+three +networking+planes+is+an+access+point+configured+by+a+WLAN +controllerandsource=blandots=Gqcr0edoC1andsig=aiXdcrWSHcgrRrznuWpICAibprMandhl=enandsa=Xandved=0ahU KEwiWmqmcj6vZAhVJy6QKHTnhDt0Q6AEIPTAE#v=onepageandq=plane%20of%20the%20three% 20networking%20planes%20is% 20an%20access%20point%20configured%20by%20a%20WLAN% 20controllerandf=false

Correct Answer: D

Correct Answer: B

Correct Answer: D

https://www.cwnp.com/forums/posts?postNum=292616

Correct Answer: C

Correct Answer: D

Reference https://supportforums.cisco.com/t5/wireless-mobility-documents/802-11-sniffer-capture-analysis- management-frames-and-open-auth/ta-p/3120622

Correct Answer: C

Correct Answer: A

The frame type that is used to reserve the wireless medium for the transmission of high data rate frames that may not be understood by all clients connected to the BSS is RTS. RTS stands for Request to Send and is a control frame that is sent by a station to request access to the medium for a specified duration. The RTS frame contains the source and destination MAC addresses, as well as a Network Allocation Vector (NAV) value that indicates how long the medium will be occupied. The destination station responds with a Clear to Send (CTS) frame that echoes the NAV value and grants permission to the source station. All other stations in the BSS hear either the RTS or CTS frame and update their NAV timers accordingly, deferring their transmissions until the medium is free. The RTS/CTS mechanism can be used to prevent hidden node problems, reduce collisions, and protect high data rate frames that use features such as 802.11n or 802.11ac that may not be compatible with legacy stations. ACK, Beacon, and PS-Poll are not used to reserve the medium for high data rate frames. References: [CWNP Certified Wireless Network Administrator Official Study Guide: WNA-107], page 112; [CWNA: Certified Wireless Network Administrator Official Study Guide: WNA-106], page 102.

Correct Answer: B

A possible cause of a sudden change in performance for the laptop computers is that a new tenant in the building has set their AP to the same RF channel that your customer is using. This can create co-channel interference (CCI), which is a situation where two or more APs or devices use the same or overlapping channels in the same area. CCI can degrade the performance of WLANs by increasing contention, collisions, retransmissions, and latency. CCI can also reduce the effective range and throughput of WLANs by lowering the signal-to-noise ratio (SNR). To avoid or mitigate CCI, it is recommended to use non- overlapping channels, adjust transmit power levels, or implement channel management techniques such as dynamic frequency selection (DFS) or load balancing. The sky condition, antenna position, or Bluetooth headset are not likely to cause a sudden change in performance for the laptop computers. References: [CWNP Certified Wireless Network Administrator Official Study Guide: WNA-107], page 81; [CWNA: Certified Wireless Network Administrator Official Study Guide: WNA-106], page 71.