Which PAgP mode combination will prevent an EtherChannel from forming?
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Correct answer: auto/auto.
Why this is the answer
The auto/auto PAgP mode combination will prevent an EtherChannel from forming because both sides are configured in passive listening mode. PAgP auto mode means the interface will listen for PAgP packets but will not initiate negotiation. For an EtherChannel to form using PAgP, at least one side must be in an active negotiation mode (desirable). auto/desirable: This combination works because desirable actively attempts to form the channel, and auto will respond. desirable/desirable: This combination works because both sides actively attempt to form the channel. desirable/auto: This combination works for the same reason as auto/desirable.
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