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Which statement about the use of PagP link aggregation on a Cisco switch that is running Cisco IOS Software is true?
Correct Answer: A
Explanation/Reference: Explanation: 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