Certified Wireless Design Professional (CWDP)

Question 1

Excessive uplink RTP frame retransmissions can result in ____________. (Choose 3)

A. MOS scores in excess of 5

B. Head-of-Line blocking at the receiver

C. Shortened battery life of a transmitting station

D. Increased jitter in a VoWiFi connection

E. Deauthentication of the transmitter by the receiver

F. Lowering of the data transmission rate by the transmitting station

Correct Answer: C,D,F

Question 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. - 62 dBm

B. - 75 dBm

C. - 67 dBm

D. - 58 dBm

E. - 72 dBm

Correct Answer: C

Question 3

When performing an indoor predictive site survey to make the WLAN planning and design
cycle more efficient, what is a best practice for configuration of the simulated APs in the predictive modeling software?

A. All simulated APs should be set to 20 MHz channels only.

B. If dynamic RRM will be used, AP transmit power should be set to an estimated average level of the expected client devices, such as 25 mW.

C. Always use the default 2.2 dBi omnidirectional antenna patterns for simulated APs.

D. Defining custom AP and antenna patterns will yield more accurate prediction data than the pre-configured vendor AP/antenna combinations.

Correct Answer: B

Question 4

You are working on a VoWLAN design with your customer's wired networking team. How many distinct priority levels do you expect for the voice applications?

A. 1 priority level for VoWLAN client traffic, 1 priority level for wired VoIP client traffic

B. 1 priority level for voice RTP, 1 priority level for voice control and RTCP

C. 1 priority level per client and AP pair, so the total number depends on the expected number of clients

D. 1 priority level, but 2 queues (one for uplink traffic, one for downlink traffic)

Correct Answer: B

Question 5

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

A. Figure 3

B. Figure 1

C. Figure 2

D. Figure 4

Correct Answer: B

Question 6

When a WLAN controller transmits an Ethernet frame that has an IEEE 802.11 frame as its payload to a lightweight AP, what type of QoS marks can be applied to the Ethernet frame and/or its payload? (Choose 3)

A. IEEE 802.1Q PCP marks in the Ethernet frame header

B. MPLS tags from the Label Edge Router (LER)

C. RSVP tag if RTP is the payload of the IEEE 802.11 frame

D. Throughput subscription marks in the Ethernet frame header

E. User Priority marks in the IEEE 802.11 frame header

F. DSCP marks to the ToS bits in the encapsulating IP packet header

Correct Answer: A,E,F

CWNP Certified Wireless Design Professional (CWDP) - PW0-250 Exam Practice Test

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