350-401 Question #464: Real Exam Question with Answer & Explanation

The correct answer is B: SW1(config-if)#channel-group 10 mode active. The exhibit indicates SW2 is configured for LACP passive mode, which means it waits for an active LACP peer. To form a port channel, SW1 must be configured for LACP active mode.

Submitted by the_admin· Mar 6, 2026

Question

Refer to the exhibit. A network engineer troubleshoots an issue with the port channel between SW1 and SW2. Which command resolves the issue?

Options

ASW2(config-if)#switchport mode trunk
BSW1(config-if)#channel-group 10 mode active
CSW1(config-if)#channel-group 10 mode desirable
DSW2(config-if)#channel-group 10 mode on

Explanation

The exhibit indicates SW2 is configured for LACP passive mode, which means it waits for an active LACP peer. To form a port channel, SW1 must be configured for LACP active mode.

Common mistakes.

A. While switchport mode trunk is typically needed for aggregated links, the immediate issue preventing the port channel from forming is the LACP negotiation failure due to mismatched LACP modes.
C. Configuring SW1 to desirable mode uses PAgP, not LACP; since SW2 is configured for LACP passive, the protocols would not match, and the port channel would not form.
D. Configuring SW2 to on mode puts it into an unconditional EtherChannel, which requires the peer to also be in on mode; this would not work with SW1 in LACP active or desirable.

Concept tested. LACP port channel negotiation modes

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_55_se/configuration/guide/scg3750/swethchl.html

Topics

#Port Channel#LACP#EtherChannel Configuration#Troubleshooting

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