CWDP CWDP Roaming and Client Mobility 3

Question 1

What is the typical roaming latency target for seamless VoIP handoff using 802.11r?

Accepted Answer

Under 50 ms

Answer

802.11r targets roaming latency under 50 ms to prevent audible gaps or dropped VoIP calls during AP transitions.

Question 2

In a CWDP design, what is the purpose of 'band steering' in relation to client mobility?

Accepted Answer

Force clients to use 5 GHz to reduce 2.4 GHz congestion

Answer

Band steering encourages capable clients to associate on 5 GHz, freeing 2.4 GHz for legacy devices and reducing interference.

Question 3

A client is associated at -80 dBm to AP-1, and AP-2 is available at -70 dBm. The client has not roamed. What is the most likely cause?

Accepted Answer

The client's roaming algorithm has insufficient RSSI delta or high hysteresis

Answer

Some clients require a larger RSSI improvement than 10 dB or have conservative hysteresis settings that prevent them from roaming.

Question 4

What is a mobility domain in the context of 802.11r fast BSS transition?

Accepted Answer

A group of APs sharing the same SSID and 802.11r configuration that allow fast roaming between them

Answer

An 802.11r mobility domain is identified by a Mobility Domain ID (MDID) shared among APs that support fast transitions between them.

Question 5

Which client behavior is improved by deploying IEEE 802.11v BSS Transition Management in a high-density environment?

Accepted Answer

Load balancing by steering overloaded APs' clients to less-utilized APs

Answer

802.11v BTM allows overloaded APs to request clients move to underutilized neighbors, improving overall load distribution.

Certified Wireless Design Professional (CWDP) Practice Test