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Welcome to the ZyXEL Networking Glossary - your definitive source for descriptions of networking terms and ZyXEL's product features.

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    Untrusted ports

    In IP source guard, there are two sets of untrusted ports, one for DHCP snooping and one for ARP inspection. For DHCP snooping, untrusted ports are connected to subscribers, so the system discards DHCP packets from untrusted ports. For ARP inspection, ARP packets from untrusted ports are discarded if the sender's information in the ARP packet does not match any bindings.