Question 40
During a planned campus-network change at a public library in Portland, operators discover that an access port forwards untagged frames into the wrong VLAN while its IP gateway configuration is correct. The design must preserve staff and visitor wireless access. Which test result most directly confirms the required behavior?
Explanation
Correct Answer
This observation tests the Ethernet frame, VLAN and IP layer interpretation requirement at a public library in Portland. The expected result is that the packet path is explained by MAC learning and VLAN tags at Layer 2 or by destination-prefix lookup at Layer 3 as appropriate. The necessary correction is to separate MAC/VLAN switching behavior from IP subnet routing and inspect the correct header and forwarding table for the symptom; a saved configuration alone would not prove it is working. In this case, the observed fault is that an access port forwards untagged frames into the wrong VLAN while its IP gateway configuration is correct.
Incorrect Answers
At a public library in Portland, this would verify RSTP root election and loop prevention, not the failure reported in this scenario. The requested closure criterion instead concerns Ethernet frame, VLAN and IP layer interpretation: the packet path is explained by MAC learning and VLAN tags at Layer 2 or by destination-prefix lookup at Layer 3 as appropriate.
At a public library in Portland, the observation may be useful for a separate 802.11, 802.1 and 802.3 protocol boundaries test, but it does not establish that an access port forwards untagged frames into the wrong VLAN while its IP gateway configuration is correct has been resolved. The relevant check is the Ethernet frame, VLAN and IP layer interpretation outcome.
At a public library in Portland, this would verify Static/default route and route preference, not the failure reported in this scenario. The requested closure criterion instead concerns Ethernet frame, VLAN and IP layer interpretation: the packet path is explained by MAC learning and VLAN tags at Layer 2 or by destination-prefix lookup at Layer 3 as appropriate.