350-401 Question #162: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer reconfigures the pot-channel between SW1 and SW2 from an access port to a trunk and immediately notices this error in SW1's log. Which command set resolves this error?

Options

• ASW1(config-if)#interface G0/0
• BSW1(config-if)#interface G0/0
• CSW1(config-if)#interface G0/0
• DSW1(config-if)#interface G0/1

Explanation

Explanation

Option B is correct because when converting a port-channel from access to trunk mode, you must ensure the physical member interfaces (in this case G0/0) are also configured as trunk ports with matching encapsulation (typically switchport trunk encapsulation dot1q followed by switchport mode trunk), resolving the STP or negotiation error caused by the mismatch between the port-channel logical interface and its physical members. Options A and C are incorrect because, while they reference the same interface (G0/0), they either apply incomplete or incorrect commands that do not fully resolve the trunk mismatch - the full correct command sequence under G0/0 must include both the encapsulation and mode trunk statements. Option D is incorrect because G0/1 is not the member interface involved in the port-channel causing the error, so reconfiguring it would not address the logged issue on SW1.

Memory Tip: Think "Physical Matches Logical" - whenever you change a Port-Channel (logical) to trunk mode, always update the physical member interfaces to match; the error will always point you to the interface that has the mismatch.

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