350-401 · Question #885
Which of the following are valid Port Aggregation Protocol (PAgP) modes? (Choose two.)
The correct answer is D. Auto E. Desirable. Port Aggregation Protocol (PAgP) facilitates the automatic negotiation of EtherChannels using two primary modes: Auto and Desirable.
Question
Options
- AOn
- BActive
- CPassive
- DAuto
- EDesirable
How the community answered
(38 responses)- A3% (1)
- B3% (1)
- D95% (36)
Why each option
Port Aggregation Protocol (PAgP) facilitates the automatic negotiation of EtherChannels using two primary modes: Auto and Desirable.
The `On` mode is a static configuration that forces an interface into an EtherChannel without any negotiation protocol like PAgP or LACP.
`Active` is a negotiation mode specific to Link Aggregation Control Protocol (LACP), not PAgP.
`Passive` is a negotiation mode specific to Link Aggregation Control Protocol (LACP), not PAgP.
The `auto` mode places an interface in a passive negotiation state, meaning it will listen for PAgP packets from a partner and respond to them, but it will not initiate the EtherChannel negotiation itself.
The `desirable` mode places an interface in an active negotiation state, causing it to actively send PAgP packets and attempt to establish an EtherChannel with another interface.
Concept tested: PAgP negotiation modes
Source: https://www.cisco.com/c/en/us/td/docs/ios/lanswitch/configuration/guide/lsw_c1.html#wp1020084
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