CWNP PW0-250 問題集

質問 1：
You deployed an AP and installed its antenna, and you now need to set the AP transmit power. Given a desired EIRP of 21 dBm, and an antenna gain of 5.85 dBd connected
through 25 feet of cable with a loss specification of 4 dB/100 feet. Assuming that there is no significant loss from the connectors, what should be the transmit power level for this AP?
A. 10 mW
B. 14 mW
C. 25 mW
D. 20 mW
E. 40 mW
F. 50 mW
正解：C

質問 2：
You are site surveying a network for VoWiFi. You have positioned an AP for a manual survey and are moving away from the AP with a phone in Survey Mode in your hand and you are reading the RSSI value of the signal received from the AP. You have previously determined that the noise floor was approximately -94 dBm on this floor of the building. The phone's documentation does not specify a recommended RSSI or SNR value for best performance. Based on the information provided and the type of device (VoWiFi phone) you are deploying, what minimum RSSI should you plan for in all areas you are monitoring and where VoWiFi service is desired?
A. - 72 dBm
B. - 62 dBm
C. - 75 dBm
D. - 67 dBm
E. - 58 dBm
正解：D

質問 3：
Assuming an identical RF environment,

which one of these scenarios is most likely to lead to a client-to-AP link imbalance in which one-way communication results?
A. Option A
B. Option C
C. Option D
D. Option B
正解：D

質問 4：
When preparing a floor plan graphic for use in predictive and manual site surveying, what calibration method will lead to the most accurate and reliable RF data?
A. Use the known size of a small object, such as a ceiling tile, and use a single instance of this object (e.g. a single ceiling tile) to scale the floor plan.
B. Use the longest available measurement (like a straight exterior wall) to calibrate the graphic's scale.
C. Measure the width of an actual office doorway with a tape measure and use this value to calibrate against a doorway graphic.
D. Calibrate the ceiling height of the floor plan first, then the survey software should be able to auto-calibrate the X and Y planes of the graphic.
E. With properly formatted .bmp and .png graphics, the site survey software should be able to extract the scale directly from the graphic data during import.
正解：B

質問 5：
In this question, you will compare the mobility processes of a network that supports WPA2Personal and WPA2-Enterprise. Assume the use of a 15-character ASCII passphrase for WPA2-Personal and EAP-TTLS/MSCHAPv2 with WPA2-Enterprise. Also, assume that proprietary roaming protocols are not supported.
When a device transitions from one BSS to another within the same ESS, what steps must be performed in the WPA2-Enterprise transition that are not performed in the WPA2Personal transition? (Choose 2)
A. Open System Authentication
B. Conversion of passphrase to PMK
C. 802.11 Reassociation
D. 4-Way Handshake
E. Transfer of PMK from AAA server to authenticator
F. 802.1X authentication
正解：E,F

質問 6：
In a centralized WLAN architecture, what new problem may arise when you change the data forwarding model from centralized to distributed? (Choose 2)
A. The Ethernet switch ports to which APs are connected may need to be reconfigured to support VLAN tagging and QoS at the network edge.
B. APs will not have the processing capabilities to support AES-CCMP, so TKIP will be the recommended encryption method.
C. APs that were designed for a centralized forwarding model may not support all features in distributed forwarding mode.
D. Centralized control functions, such as key management and distribution, RRM, and load balancing will no longer be supported.
E. All RRM controls will also need to be distributed to a master AP that acts as a channel and transmit power arbiter for other APs in the ESS.
正解：A,C