Which two EtherChannel PAgP modes can you configure? (Choose two.)
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A. B. C. D. E.BD
EtherChannel is a link aggregation technique that allows multiple physical links to be bundled into a single logical link. Link aggregation provides increased bandwidth, redundancy, and load balancing capabilities. Cisco's proprietary Protocol Aggregation Protocol (PAgP) is a link aggregation control protocol that is used to dynamically configure and manage EtherChannel links between Cisco devices.
There are two modes of PAgP that can be configured:
Desirable: In this mode, the interface actively tries to form an EtherChannel by sending PAgP packets to the other end of the link. If the other end responds with a compatible mode (desirable or auto), the link will be aggregated.
Auto: In this mode, the interface will listen for PAgP packets from the other end of the link. If the other end is in desirable mode, the link will be aggregated. If the other end is in auto mode, the link will not be aggregated.
The other three modes listed in the question are Link Aggregation Control Protocol (LACP) modes and not PAgP modes. They are:
On: In this mode, the interface will not send or listen for PAgP or LACP packets. The link will be manually configured as a member of an EtherChannel.
Passive: In this mode, the interface will listen for PAgP packets from the other end of the link, but will not actively try to form an EtherChannel. If the other end is in desirable mode, the link will be aggregated. If the other end is in auto mode, the link will not be aggregated.
Active: In this mode, the interface actively tries to form an EtherChannel by sending LACP packets to the other end of the link. If the other end responds with a compatible mode (active or passive), the link will be aggregated.
In summary, the two PAgP modes that can be configured are desirable and auto.