Question 180
At Keystone Research, the laboratory platform group is preparing a research campus upgrade. The operational constraint is evidence-based change approval. After a proposed fix, the team needs observable evidence that it resolved: Two parallel uplink cables cause inconsistent connectivity because only one end participates in LACP. Which result BEST demonstrates that this specific issue was resolved?
Explanation
Correct Answer
Both physical links appear as collecting/distributing members of the intended aggregation group. This is the relevant acceptance observation for the reported issue: Two parallel uplink cables cause inconsistent connectivity because only one end participates in LACP. The intended corrective choice is: Configure matching LACP aggregation membership and compatible LAG settings on both ends. At Keystone Research, this outcome verifies actual operation under evidence-based change approval, rather than only a ticket marked complete.
Incorrect Answers
Topology output identifies the planned root bridge and redundant paths are loop-free. Such an observation would verify a separate issue: A redundant Layer 2 campus has an unpredictable root bridge after a new switch joins. It would follow the distinct action: Specify the intended MSTP region and root priority for the appropriate spanning-tree instance. Here the reported failure is Two parallel uplink cables cause inconsistent connectivity because only one end participates in LACP. The decisive result for Keystone Research must instead be: Both physical links appear as collecting/distributing members of the intended aggregation group.
Client MAC addresses learn in their designated VLANs and inter-VLAN reachability follows the routing policy. Such an observation would verify a separate issue: Two hosts in different access VLANs appear on ports configured in the same untagged VLAN accidentally. It would follow the distinct action: Set each access port's intended VLAN membership and verify MAC learning by VLAN. Here the reported failure is Two parallel uplink cables cause inconsistent connectivity because only one end participates in LACP. The decisive result for Keystone Research must instead be: Both physical links appear as collecting/distributing members of the intended aggregation group.
Operational status reports the expected primary/secondary relationship and independent device management. Such an observation would verify a separate issue: A network team expects two independently managed chassis to form a single control-plane stack with VSX. It would follow the distinct action: Configure a supported VSX pair with its inter-switch link and keepalive rather than conflating VSX with VSF. Here the reported failure is Two parallel uplink cables cause inconsistent connectivity because only one end participates in LACP. The decisive result for Keystone Research must instead be: Both physical links appear as collecting/distributing members of the intended aggregation group.