Question 530
At New Teaching Block, an IoT device starts offering leases that override the authorized corporate DHCP scope. Which observation most directly isolates the likely cause before any change?
Explanation
Correct Answer
For New Teaching Block, the decisive mechanism is DHCP snooping trust boundary. DHCP snooping prevents DHCP-server responses from untrusted ports. Inspect dropped server replies from untrusted ports and the binding table is the most direct way to isolate this particular failure before making a change.
Incorrect Answers
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 New Teaching Block case, Those observations could be normal while the stated fault persists. The specific mechanism is dHCP snooping prevents DHCP-server responses from untrusted ports
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 New Teaching Block case, Those observations could be normal while the stated fault persists. The specific mechanism is dHCP snooping prevents DHCP-server responses from untrusted ports
This is relevant to Access VLAN classification, where an access port carries untagged frames in one configured access VLAN In the New Teaching Block case, Those observations could be normal while the stated fault persists. The specific mechanism is dHCP snooping prevents DHCP-server responses from untrusted ports