An engineer is bundling three physical links between SW1 and SW2 into a single Layer 2 EtherChannel. Before the member ports will bundle, the configuration on every member interface must be consistent on both switches. Which three interface settings must be identical across all member ports for them to join the same EtherChannel? Select THREE.
- AThe duplex setting configured on each member interface Correct
- BThe interface description string entered on each member port
- CThe switchport mode and, on a trunk, the allowed and native VLANs Correct
- DThe operating speed configured on each member interface Correct
- EThe unique IP address assigned to each member interface
Why A is correct: All member ports must run at the same duplex; a port whose duplex differs from the others is held out of the bundle, so duplex is a required consistency setting.
Why B is wrong: A description is a local label only and has no effect on bundling; ports with different descriptions bundle normally, so it is tempting cosmetic detail but not a requirement.
Why C is correct: Every member must agree on access or trunk mode and, for trunks, the same allowed VLANs and native VLAN, or the inconsistent port is excluded from the channel.
Why D is correct: Member ports must share the same speed; mixing a port at a different speed prevents it joining, so consistent speed across all members is mandatory.
Why E is wrong: Layer 2 member ports carry no IP address at all, and a routed bundle is addressed on the port-channel, not on the members, so per-member IP addresses are wrong here.