| Exam 300-115 | Question id=1385 | Layer 2 Technologies |
A network engineer changed the port speed and duplex setting of an existing EtherChannel bundle that uses the PAgP protocol. Which statement describes what happens to all ports in the bundle?
| A. |
PAgP changes the port speed and duplex for all ports in the bundle. | |
| B. |
PAgP drops the ports that do not match the configuration. | |
| C. |
PAgP does not change the port speed and duplex for all ports in the bundle until the switch is rebooted. | |
| D. |
PAgP changes the port speed but not the duplex for all ports in the bundle. |
PAgP aids in the automatic creation of EtherChannel links. PAgP packets are sent between EtherChannel-capable ports in order to negotiate the formation of a channel. Some restrictions are deliberately introduced into PAgP. The restrictions are:
* PAgP does not form a bundle on ports that are configured for dynamic VLANs. PAgP requires that all ports in the channel belong to the same VLAN or are configured as trunk ports. When a bundle already exists and a VLAN of a port is modified, all ports in the bundle are modified to match that
VLAN.
* PAgP does not group ports that operate at different speeds or port duplex. If speed and duplex change when a bundle exists, PAgP changes the port speed and duplex for all ports in the bundle.
* PAgP modes are off, auto, desirable, and on. Only the combinations auto-desirable, desirable-desirable, and on-on allow the formation of a channel.
The device on the other side must have PAgP set to on if a device on one side of the channel does not support PAgP, such as a router.