| Exam 300-115 | Question id=1382 | Layer 2 Technologies |
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. |
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.