CWNP CWDP Certifications PW0-250 Questions & Answers

• Question 31:

  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. 20 mW

  D. 25 mW

  E. 40 mW

  F. 50 mW

  Correct Answer: D

• Question 32:

  The exhibit illustrates the azimuth and elevation for what type of antenna?

  

  A. Omni-directional

  B. 20 degree vertical yagi

  C. 120 degree horizontal sector

  D. 60 degree horizontal patch

  E. 10 degree vertical grid

  Correct Answer: C

• Question 33:

  What is a radome?

  A. A type of semi-circular ceiling found in atriums and that is a heavy cause of RF reflection.

  B. A weatherproof piece of plastic covering an antenna or antenna system.

  C. The unit used to measure the signal reflected backward by the end of a cable.

  D. A piece of metal positioned behind APs mounted on outdoor poles, designed to limit the butterfly effect.

  E. The unwanted signal coverage provided by either side or back lobes in directional antennas.

  Correct Answer: B

• Question 34:

  What antenna connector type is displayed in the exhibit?

  

  A. RP-TNC

  B. RP-SMA

  C. N Connector

  D. MC Connector

  E. MMCX

  Correct Answer: B

• Question 35:

  What type of pattern matches the 12 dBi antenna displayed in the exhibit?

  

  A. Figure 1

  B. Figure 2

  C. Figure 3

  D. Figure 4

  Correct Answer: A

• Question 36:

  What is the purpose of Friis transmission equation [(LdB) = 20 log(d) + 20 log (f) - 27.55 ]?

  A. Calculate earth bulge to determine minimum antenna height

  B. Calculate receive sensitivity for an 802.11 radio/antenna pair

  C. Calculate RF path loss in free space

  D. Calculate the loss experienced between the intentional radiator and antenna

  E. Calculate the minimum voltage requirements for lightning suppression systems

  Correct Answer: C

• Question 37:

  Why does a frame transmitted at 1 Mbps have a greater usable range than the same frame transmitted at 54 Mbps?

  A. Free space path loss causes greater signal dispersion for higher rate transmissions.

  B. Receiver sensitivity requirements are lower for frames transmitted with less complex modulation and coding.

  C. To improve reliability, 802.11 STAs increase transmit power as the signaling rate decreases.

  D. Lower data rate RF transmissions travel at higher speeds and are less likely to experience collisions.

  E. Frames sent at higher data rates are also sent at higher power levels and are therefore more prone to collisions and multipath.

  Correct Answer: B

• Question 38:

  What RF math formula should be used to convert an RF value in units of dBm into a value of mW?

  *NotE. "dBm" in the formulas represents the known dBm value

  A. mW 10(dBm/10)

  B. mW

  C. mW

  D. mW

  E. mW

  F. mW =

  Correct Answer: A

• Question 39:

  What is the purpose of DHCP Option 43, and how is it used with WLANs?

  A. It provides clients with a temporary IP address on a restricted VLAN until 802.1X authentication is completed. Then the client receives its long-term IP address.

  B. It provides IP address bindings for specific network nodes that require long-term IP address assignments. WLAN controllers are configured to use Option 43 to receive long-term IP address leases that are centrally managed with DHCP.

  C. It supports vendor-specific IP address attributes for node discovery purposes. APs use Option 43 with vendor class identifiers to obtain the IP address of a centralized WLAN controller.

  D. It integrates a DHCP server with AAA servers and user databases to dynamically assign IP addresses to client devices. During 802.1X, the AAA server uses Option 43 to notify the DHCP server what IP pool the client's address should be drawn from.

  Correct Answer: C

• Question 40:

  In a multiple channel architecture (MCA) network supporting 802.1X authentication, what aspects of WLAN design affect client roaming efficiency and effectiveness? (Choose 3)

  A. Channels supported by infrastructure

  B. Key caching protocols

  C. Cipher suite

  D. PHY standard used by client

  E. Supported uplink and downlink MCS rates

  F. The infrastructure's roaming algorithm

  G. Channels supported and scanned by client

  Correct Answer: ABG