Question 1120
At Central Hall, a laptop passes 802.1X but receives a 169.254 address instead of the expected VLAN lease. What targeted evidence should the network engineer collect first?
Explanation
Correct Answer
For Central Hall, the decisive mechanism is DHCP address-acquisition failure. Network authorization and DHCP allocation are separate stages requiring their own diagnostics. Inspect authorized port VLAN DHCP DISCOVER/OFFER and relay counters is the most direct way to isolate this particular failure before making a change.
Incorrect Answers
This is relevant to Wrong VLAN mapping, where wLAN-to-wired mapping errors can appear as a DHCP or authorization defect In the Central Hall case, Those observations could be normal while the stated fault persists. The specific mechanism is network authorization and DHCP allocation are separate stages requiring their own diagnostics
This is relevant to STP convergence fault, where sTP role and root election determine the alternate Layer 2 forwarding path In the Central Hall case, Those observations could be normal while the stated fault persists. The specific mechanism is network authorization and DHCP allocation are separate stages requiring their own diagnostics
This is relevant to Routed blackhole, where route presence alone does not prove usable bidirectional forwarding In the Central Hall case, Those observations could be normal while the stated fault persists. The specific mechanism is network authorization and DHCP allocation are separate stages requiring their own diagnostics