With Binding Table Recovery enabled, which two devices perform recovery of missing binding table entries? (Choose two.)
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Correct answer: destination host, DHCP server.
Why this is the answer
Binding Table Recovery (BTR) is a feature designed to restore missing entries in the DHCP snooping binding table, which is crucial for security features like IP Source Guard. When BTR is enabled, the DHCP server and the destination host are the two devices that participate in the recovery process. The DHCP server can re-send DHCP ACK messages for known leases, which helps repopulate the binding table. The destination host, by initiating traffic (e.g., ARP requests or IP traffic), can trigger the switch to perform a DHCP snooping lookup and, if necessary, request an update from the DHCP server or learn the binding directly if the DHCP server responds. The DHCP client and source host are typically the devices whose bindings are being tracked, not the ones actively performing recovery. The DHCP relay agent forwards DHCP messages but doesn't actively recover binding table entries itself.
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