Question 430
At North Residence, clients lose IPv4 connectivity when dynamic ARP inspection is enabled without expected bindings. What measured or witnessed result should be required before signoff?
Explanation
Correct Answer
For North Residence, the decisive mechanism is ARP inspection dependency. Dynamic ARP inspection relies on credible address-to-MAC bindings to reject spoofing. Confirm legitimate ARP works while spoofed gateway replies are blocked supplies measurable, case-relevant evidence that the intended behavior actually occurs.
Incorrect Answers
This is relevant to Access VLAN classification, where an access port carries untagged frames in one configured access VLAN In the North Residence case, That test could pass while the actual user-facing requirement still fails. The specific mechanism is dynamic ARP inspection relies on credible address-to-MAC bindings to reject spoofing
This is relevant to Tagged trunk allowlist, where a VLAN trunk forwards only permitted tagged VLANs and its native VLAN according to configuration In the North Residence case, That test could pass while the actual user-facing requirement still fails. The specific mechanism is dynamic ARP inspection relies on credible address-to-MAC bindings to reject spoofing
This is relevant to Voice VLAN LLDP-MED, where lLDP-MED can advertise voice-network attributes while the switch enforces separate VLAN policies In the North Residence case, That test could pass while the actual user-facing requirement still fails. The specific mechanism is dynamic ARP inspection relies on credible address-to-MAC bindings to reject spoofing