Select the three PAgP channel establishment modes. (Choose three.)
- active
- passive
- desirable
- on
- auto
- blocking
Answers Explanation & Hints: PAgP (Port Aggregation Protocol) is a Cisco proprietary protocol for the automatic bundling of multiple physical ports into a single logical link, and it also has three channel establishment modes:
- Desirable
- Auto
- On
In the desirable mode, the interface actively tries to form a channel with another interface that is also set to “desirable” or “auto” mode. If the other interface is set to “desirable” mode, then the channel is formed using PAgP negotiation. If the other interface is set to “auto” mode, the channel is formed without negotiation.
In the auto mode, the interface passively waits for the other interface to initiate PAgP negotiation. If the other interface is set to “desirable” mode, then the channel is formed using PAgP negotiation. If the other interface is also set to “auto” mode, the channel is formed without negotiation.
In the on mode, the interface is manually configured to be part of an EtherChannel without using PAgP negotiation.