Which feature drops packets when the source address is not present in the snooping table?
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Correct answer: IPv6 Source Guard.
Why this is the answer
IPv6 Source Guard drops packets when the source IPv6 address in the packet header does not match an entry in the snooping binding table. This prevents unauthorized devices from spoofing legitimate IPv6 addresses. IPv6 Destination Guard protects against traffic being sent to unauthorized destinations. Binding Table Recovery is a mechanism for restoring the binding table after a device restart, not a packet filtering feature. IPv6 Prefix Guard prevents unauthorized prefixes from being advertised or used on a link.
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