Which statement about the use of PagP link aggregation on a Cisco switch that is running Cisco IOS Software is true?

A. PagP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on allow the formation of a channel.

B. PagP modes are active, desirable, and on. Only the combinations active-desirable, desirable-desirable, and on-on allow the formation of a channel.

C. PagP modes are active, desirable, and on. Only the combinations active-active, desirable-desirable, and on-on allow the formation of a channel.

D. PagP modes are off, active, desirable, and on. Only the combinations auto-auto, desirable-desirable, and on-on allow the formation of a channel.








 

Suggested Answer: A

PagP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on will allow a channel to be formed.
The PagP modes are explained below.
1. on: PagP will not run. The channel is forced to come up.
2. off: PagP will not run. The channel is forced to remain down.
3. auto: PagP is running passively. The formation of a channel is desired; however, it is not initiated.
4. desirable: PagP is running actively. The formation of a channel is desired and initiated.
Only the combinations of auto-desirable, desirable-desirable, and on-on will allow a channel to be formed. If a device on one side of the channel does not support
PagP, such as a router, the device on the other side must have PagP set to on.
Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-2900-xl-series-switches/21041-131.html

This question is in 300-115 Implementing Cisco IP Switched Networks (SWITCH) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate





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