CWNP CWDP-302 問題集

質問 1：
While designing a WLAN, it is important to create a channel plan that avoids or diminishes co-channel interface. A common mistake is to ensure little or no co-channel interference occurs at each AP location and do no other analysis.
Why is this a mistake?
A. Because CCI never occurs at AP locations.
B. Because ACI, the same as CCI, must also be considered.
C. Because CCI can occur at AP and client locations.
D. Because CCI is related only to 5 GHz operations.
正解：B

質問 2：
When a virtual controller architecture is in use, with most vendor solutions, how is the virtual controller assigned?
A. By the administrator directly
B. By the administrator through DNS configuration
C. By election among the APs
D. By election among the physical controllers
正解：A

質問 3：
During a post-deployment verification, you are requested to troubleshoot an area where users are experiencing poor throughput. They are using data communication only, mainly from laptops. You captured the frame showing an incorrect FCS. This frame is typical of those that were captured by the analyzer.
What does this frame reveal about the RF network in this area?
A. One station seems to be streaming video, thus may have reserved significant bandwidth via admission control
B. Contention Free is in place in this network, which may starve some non-QoS stations from access
C. The AP seems to be too far to provide enough coverage to this area
D. Multipath or excessive collisions seem to be an issue in this area
正解：D

質問 4：
Why does a frame transmitted at 1 Mbps have a greater usable range than the same frame transmitted at 54 Mbps?
A. To improve reliability, 802.11 STAs increase transmit power as the signaling rate decreases.
B. Free space path loss causes greater signal dispersion for higher rate transmissions.
C. Lower data rate RF transmissions travel at higher speeds and are less likely to experience collisions.
D. Receiver sensitivity requirements are lower for frames transmitted with less complex modulation and coding.
正解：D

質問 5：
When defining the required number of Aps which one of the following will have the greatest impact?
A. Number of clients and the applications they run.
B. Square footage in the facility.
C. Number of clients and the antenna types they use.
D. Ceiling heights in the facility.
正解：D

質問 6：
You have selected to plan and install a controller-based WLAN. The network consists of 53 Ethernet switches running all gigabit and higher ports. Twelve network segments exist separated by routers. The WLAN controller will be placed in the network operations center. Three servers run services like DHCP, DNS and NTP.
In addition to the routers, where could ACLs be deployed that impact only the WLAN?
A. Controller
B. DNS server
C. Swith ports connected to the wired LAN
D. DHCP server
正解：C

質問 7：
Given: You are evaluating the theoretical and real-world RF gain benefits of transmit and receive features introduced by 802.11 with MIMO. This exercise allows you to quantify the feature's value in a real-world environment.
What is the maximum theoretical signal gain of chip-based TxBF and MRC (as features) when compared to the same AP using only a single antenna for transmit and receive (effectively simulating a 1x1 chip)?
A. 2 Rx or Tx chains = 1 dBi gain3 Rx or Tx chains = 2 dBi gain4 Rx or Tx chains = 3 dBi gain
B. 2 Rx or Tx chains = approx 4-6.5 dBi gain3 Rx or Tx chains = approx 7-10 dBi gain4 Rx or Tx chains = approx 10-12 dBi gain
C. 2 Rx or Tx chains = 3 dBi gain3 Rx or Tx chains = 6 dBi gain4 Rx or Tx chains = 9 dBi gain
D. 2 Rx or Tx chains = 3 dBi gain3 Rx or Tx chains = approx 5 dBi gain4 Rx or Tx chains = 6 dBi gain
正解：D

質問 8：
Which definition correctly describes the "local MAC" variation of the centralized WLAN architecture?
A. All MAC functions are performed by the AP. A minimal subset of network control is offloaded to the WLAN controller along with management and monitoring functions.
B. PHY functions are performed directly by the AP. MAC functions are divided almost equally between the WLAN controller and the AP, according to the time sensitivity of the feature or service.
C. The AP provides the RF termination point for the WLAN, but performs very few of the WLAN functions or services. The WLAN controller performs all MAC functions and the AP is very simple and lightweight.
D. All RF-, data-, and control-related WLAN functions are performed by the AP. APs coordinate network services with one another and are managed by a WNMS, so no WLAN controller is used in this architecture.
正解：A