Which of these are valid PAgP channel negotiation modes? (Choose two.)
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Correct answer: Auto, Desirable.
Why this is the answer
PAgP (Port Aggregation Protocol) is a Cisco-proprietary protocol used to negotiate EtherChannel bundles. The valid PAgP modes are "Auto" and "Desirable." "Desirable" mode actively attempts to form an EtherChannel, sending PAgP packets. "Auto" mode passively waits for another switch to initiate the negotiation, only responding to PAgP packets. Both "Auto" and "Desirable" can form an EtherChannel with a port in "Desirable" mode. "On" is a static EtherChannel configuration that does not use PAgP or LACP negotiation. "Active" and "Passive" are modes used by LACP (Link Aggregation Control Protocol), not PAgP.
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