Cisco 400-051 Exam

When a Cisco IOS gatekeeper receives an ARQ from a registered endpoint, what is the first step it will take in an attempt to resolve the destination address?

  • A. Check to see if the destination address is locally registered.
  • B. Check to see if the destination address matches the technology prefix.
  • C. Check to see if the destination address matches the local zone prefix.
  • D. Check to see if the destination address matches the remote zone prefix.
  • E. Check to see if the destination address matches the default technology prefix.
Answer: Option B.
Explanation: 

Admission Request (ARQ) and Location Request (LRQ) are the two H.225 Registration, Admission, Status (RAS) messages that trigger a gatekeeper to initiate the call routing decision process.
ARQ — Local zone messages that are sent by H.323 endpoints (usually gateways) to the Cisco gatekeeper. Gatekeepers receive ARQs from an endpoint if.
– A local zone endpoint initiates a call. OR
– A local zone endpoint request permission to admit an incoming call.

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