Question 290
At a design studio in Berlin, engineers report that one LAG member carries a different VLAN list from the other members. The work affects wireless workstations and video conferences. Which post-change observation is the strongest acceptance evidence?
Explanation
Correct Answer
This observation tests the LACP aggregation and member consistency requirement at a design studio in Berlin. The expected result is that the intended active members participate in one operational LAG and a single member loss does not interrupt the logical interface. The necessary correction is to align LACP mode, speed, member selection and VLAN parameters across both aggregation endpoints; a saved configuration alone would not prove it is working. In this case, the observed fault is that one LAG member carries a different VLAN list from the other members.
Incorrect Answers
At a design studio in Berlin, this would verify Ingress ACL enforcement and least privilege, not the failure reported in this scenario. The requested closure criterion instead concerns LACP aggregation and member consistency: the intended active members participate in one operational LAG and a single member loss does not interrupt the logical interface.
At a design studio in Berlin, the observation may be useful for a separate DHCP snooping and rogue DHCP protection test, but it does not establish that one LAG member carries a different VLAN list from the other members has been resolved. The relevant check is the LACP aggregation and member consistency outcome.
At a design studio in Berlin, this would verify Layer-two edge protection and BPDU controls, not the failure reported in this scenario. The requested closure criterion instead concerns LACP aggregation and member consistency: the intended active members participate in one operational LAG and a single member loss does not interrupt the logical interface.