Refer to the exhibit. The port channel between the switches does not work as expected. Which action resolves the issue?

Question

Exhibits

Options

• AInterface Gi0/0 on Switch2 must be configured as passive.
• BInterface Gi0/1 on Switch1 must be configured as desirable.
• CInterface Gi0/1 on Switch2 must be configured as active.
• DTrucking must be enabled on both Interfaces on Switch2.

• A
  5% (3)
• B
  3% (2)
• C
  79% (48)
• D
  13% (8)

Explanation

Explanation

Option C is correct because the port channel uses LACP (active/passive) negotiation, and for LACP to form a bundle, at least one side must be in active mode. If Switch2's Gi0/1 is set to passive while Switch1's Gi0/1 is also passive, neither switch will initiate LACP negotiation, causing the port channel to fail - changing Switch2's Gi0/1 to active resolves this.

Why the distractors are wrong:

• A is wrong because making Switch2's Gi0/0 passive would create the same passive-passive problem on that interface, not fix it.
• B is wrong because "desirable" is a PAgP keyword (Cisco proprietary), not LACP - mixing protocols would prevent the port channel from forming.
• D is wrong because trunking is a separate Layer 2 configuration; the issue here is specifically the LACP negotiation mode mismatch, not trunking.

Memory Tip

Think of LACP like a conversation: two passive people never start talking. At least one side must be active (the one who "speaks first") for the link to come up. Remember: LACP = Active/Passive, PAgP = Desirable/Auto - never mix them!

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