| Explanation & Hint:
The ip arp inspection vlan 10 command enables Dynamic ARP Inspection (DAI) for VLAN 10 on a switch. DAI is a security feature that checks ARP packets on the interfaces of a switch. It ensures that only valid ARP requests and responses are relayed. The switch checks the ARP packet against a trusted database of IP-to-MAC address bindings, which is usually built by DHCP snooping.
DAI relies on DHCP snooping to build this database, so while DAI itself is not DHCP snooping, it works in conjunction with it. The other options listed do not accurately describe the effect of the ip arp inspection vlan command:
- It enables DHCP snooping globally on a switch: This is incorrect because the command specified is for ARP inspection, not DHCP snooping.
- It specifies the maximum number of L2 addresses allowed on a port: This is more related to port security settings, not ARP inspection.
- It globally enables BPDU guard on all PortFast-enabled ports: This is incorrect because BPDU guard is related to Spanning Tree Protocol protection mechanisms, not ARP inspection.
Therefore, the correct effect of entering the ip arp inspection vlan 10 command is that it enables DAI for VLAN 10, which will check ARP packets against a trusted database to prevent ARP poisoning and spoofing attacks on that VLAN. |