CWDP Roaming and Client Mobility Flashcards

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

Answer: Under 50 ms

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

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

Answer: Force clients to use 5 GHz to reduce 2.4 GHz congestion

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

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?

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

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

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

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

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

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

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

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

When designing WLAN for a convention center with thousands of roaming attendees, which feature is most critical to prevent authentication server overload during mass roaming events?

Answer: PMK caching (OKC or 802.11r) to minimize EAP re-authentications

PMK caching dramatically reduces RADIUS server load by allowing most roaming events to complete without a full EAP exchange.