Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 71

Which PAgP mode combination prevents an EtherChannel from forming?

Answer options

• A. auto/desirable
• B. desirable/desirable
• C. desirable/auto
• D. auto/auto

Correct answer: D

Explanation

The correct answer, D (auto/auto), indicates that both ends are in auto mode, which means neither side will actively attempt to form an EtherChannel. The other combinations, A, B, and C, allow for at least one side to initiate the channel establishment process, thus enabling the EtherChannel to form.