Question

Which two channel group modes would place an interface in a negotiating state using PAgP? (Choose two.)

A) On
B) Desirable
C) Active
D) Auto
E) Passive

Answer 1

In PAgP, the 'Desirable' and 'Auto' modes place an interface in a negotiating state, with 'Desirable' actively initiating negotiation and 'Auto' passively waiting for negotiation packets.

Step-by-step explanation:

The two channel group modes that would place an interface in a negotiating state using PAgP (Port Aggregation Protocol) are Desirable and Auto. These modes allow interfaces to negotiate with connected devices to form a Cisco EtherChannel link either actively or passively. In Desirable mode, the interface actively sends PAgP packets and initiates negotiations with other ports. In Auto mode, the interface is in a passive negotiating state, waiting to receive PAgP packets but not actively seeking to form a channel. The modes On, Active, and Passive do not negotiate with PAgP. On forces the channel to be always on, and Active and Passive are modes used by LACP (Link Aggregation Control Protocol), which is a different protocol than PAgP.