CWDP CWDP Outdoor and Mesh Networking 2

Question 1

What is the purpose of Dynamic Frequency Selection (DFS) in 5 GHz outdoor WLAN deployments?

Accepted Answer

To detect radar signals and vacate channels to prevent interference with safety systems

Answer

DFS monitors for radar transmissions and moves WLAN equipment off channels to prevent interference with radar systems.

Question 2

A designer is planning a campus outdoor WLAN using 802.11ac APs. Which channel width provides the best balance of throughput and interference avoidance in an outdoor environment?

Accepted Answer

40 MHz channels

Answer

40 MHz channels in 5 GHz outdoor deployments balance throughput with sufficient spectrum availability and reduced co-channel interference risk.

Question 3

What factor most significantly increases free-space path loss between two outdoor wireless nodes?

Accepted Answer

Doubling the operating frequency or distance

Answer

Free-space path loss increases by 6 dB when distance or frequency doubles, as defined by the Friis transmission equation.

Question 4

When designing an outdoor mesh for a smart city deployment, which protocol is used by mesh nodes to discover routes and forward traffic efficiently?

Accepted Answer

Hybrid Wireless Mesh Protocol (HWMP) defined in IEEE 802.11s

Answer

IEEE 802.11s defines HWMP as the default path selection protocol for Wi-Fi mesh networks.

Question 5

What is the recommended minimum link margin (fade margin) for a reliable outdoor point-to-point WLAN bridge link?

Accepted Answer

15–20 dB

Answer

A fade margin of 15–20 dB accounts for atmospheric fading, rain fade, and multipath variations to ensure reliable link availability.

Certified Wireless Design Professional (CWDP) Practice Test

Certified Wireless Design Professional (CWDP) Practice Test

CWDP CWDP Outdoor and Mesh Networking 2