200-301 Question #1139: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A Cisco engineer is asked to update the configuration on switch 1 so that the EtherChannel stays up when one of the links fails. Which configuration meets this requirement?

Options

• ASwitch1(config) # interface Fa0/0
• BSwitch1(config) # interface port-channel 1
• CSwitch1(config) # interface Fa0/0
• DSwitch1(config) # interface port-channel 1

Explanation

To ensure an EtherChannel remains operational when a member link fails, the configuration is applied to the logical port-channel interface, not individual physical interfaces.

Common mistakes.

• A. Configuring interface Fa0/0 would be for adding a physical interface to the channel group, not for defining the EtherChannel's overall redundancy behavior.
• C. Configuring interface Fa0/0 would be for adding a physical interface to the channel group, not for defining the EtherChannel's overall redundancy behavior.
• D. This option is identical to B, but it's a duplicate and not the designated correct answer.

Concept tested. EtherChannel logical interface configuration for redundancy

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

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