CWDP CWDP Outdoor and Mesh Networking

Question 1

What is the primary advantage of using a mesh WLAN architecture over a traditional wired infrastructure deployment in outdoor environments?

Accepted Answer

Elimination of cabling requirements by using wireless backhaul between nodes

Answer

Higher throughput than wired backhaul

Answer

Lower latency for all mesh hops

Answer

Support for more clients per access point

Question 2

In an outdoor point-to-point wireless bridge, what is the first Fresnel zone and why must it be kept clear?

Accepted Answer

An elliptical region around the direct path where reflections constructively interfere; obstruction causes significant signal loss

Answer

The line-of-sight path that must be perfectly straight

Answer

The antenna beam pattern measured at 3 dB below peak

Answer

The regulatory exclusion zone around outdoor APs

Question 3

What path loss model is most commonly used for outdoor WLAN link budget calculations in open terrain?

Accepted Answer

Free-Space Path Loss (Friis) model

Answer

Two-ray ground reflection model

Answer

ITU indoor model

Answer

Log-distance indoor model

Question 4

Which regulatory domain restriction must a CWDP consider when deploying outdoor 5 GHz point-to-point bridges in the US?

Accepted Answer

UNII-2 and UNII-2 Extended channels require DFS radar detection and avoidance

Answer

All 5 GHz channels are prohibited outdoors

Answer

Outdoor 5 GHz use is limited to UNII-3 channels only

Answer

Maximum EIRP for all outdoor 5 GHz links is 20 dBm

Question 5

In a mesh network, what is 'backhaul efficiency' and how does the number of hops affect it?

Accepted Answer

Each additional mesh hop typically halves available client throughput due to half-duplex relay overhead

Answer

Backhaul efficiency increases with each additional hop

Answer

Backhaul efficiency is independent of hop count

Answer

More hops increase redundancy without throughput penalty

Question 6

What design technique allows a mesh AP to avoid throughput halving by separating backhaul and access traffic?

Accepted Answer

Deploying dual-radio or tri-radio mesh nodes with dedicated backhaul radios

Answer

Using the same channel for both backhaul and access

Answer

Increasing transmit power on the mesh node

Answer

Using 2.4 GHz exclusively for backhaul