Cisco Certified Network Professional 2025 – 400 Free Practice Questions to Pass the Exam

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Which command is used to mark a port as trusted for Dynamic ARP Inspection?

ip arp trust

ip arp inspection trust

The command that marks a port as trusted for Dynamic ARP Inspection is "ip arp inspection trust". This command is used in the context of secure networking to allow only trusted ports to send ARP packets. This is crucial in preventing ARP spoofing attacks, where malicious devices could send falsified ARP messages over the network.

When a port is designated as trusted with this command, it enables the device connected to that port to send ARP responses, which are essential for resolving IP addresses to their corresponding MAC addresses. This designation is especially important for ports connecting to legitimate servers or devices that need to communicate ARP messages without being subject to the scrutiny that untrusted ports face.

Other commands listed do not align with the syntax or functionality required for setting a trusted ARP configuration in a Cisco environment, thereby differentiating "ip arp inspection trust" as the correct choice.

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ip arp check trust

ip trust arp

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