Cisco Certified Network Professional Practice Test

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What does "ip arp inspection validate" help ensure?

Accountability in user management
Integrity of ARP traffic
Scalability in username management
Proper authentication of users

The correct answer is: Integrity of ARP traffic

The option related to ensuring the integrity of ARP traffic is indeed correct. The command "ip arp inspection validate" is used in Dynamic ARP Inspection (DAI) on a network device, such as a switch, to verify the validity of ARP packets on a VLAN. By implementing ARP inspection, the network device can help prevent various attacks that exploit the ARP protocol, such as ARP spoofing, where a malicious actor might send fake ARP messages to associate their MAC address with the IP address of a legitimate host. When "ip arp inspection validate" is configured, it checks for host data in ARP packets against a trusted database of IP-to-MAC address mappings. This process ensures that only ARP requests and replies that are in compliance with the expected entries are allowed through the network. Consequently, the integrity of the ARP traffic is maintained, providing protection against certain types of network attacks that could lead to man-in-the-middle situations. In contrast, other options like user management, scalability, and user authentication do not directly relate to ARP traffic and focus on different aspects of network management and security. These areas, while essential for overall network operation, are not specifically addressed by the ARP inspection feature.