Which NHRP message type notifies routers of routes used by NHRP that are no longer available?
- purge
- registration
- redirect
- resolution
Explanation: Purge messages are sent to remove a cached NHRP entry. Purge messages notify routers of the loss of a route used by NHRP. Purges are typically sent by an NHS to NHCs (which it answered) to indicate that the mapping for an address/network that it answered is not valid anymore (for example, if the network is unreachable from the original station or has moved). Purge messages take the most direct path (spoke-to-spoke tunnel) if feasible. If a spoke-to-spoke tunnel is not established, purge messages are forwarded via the hub.
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