Select the three PAgP channel establishment modes.

Select the three PAgP channel establishment modes.

• A. Auto
• B. Desirable
• C. On
• D. Off

Answer: (A)

The three PAgP (Port Aggregation Protocol) channel establishment modes include Auto, Desirable, and On. PAgP is a Cisco proprietary protocol used to manage EtherChannel configurations between switches. In *Auto* mode, the switch port will respond to PAgP packets from other switches but will not initiate PAgP negotiation. This means that while a port in Auto mode will accept an EtherChannel connection if another port is in Desirable mode or another Auto mode, it does not actively try to form an EtherChannel. *Desirable* mode, on the other hand, actively initiates PAgP negotiation by sending PAgP packets and facilitates the creation of an EtherChannel with compatible ports. This mode is commonly used for connecting to another switch where an EtherChannel is desired. Although *On* is a channel establishment mode, it actually forces the interface to become part of an EtherChannel without using PAgP or any negotiation. The system will not attempt to dynamically form a channel with other devices, which makes it different from Auto and Desirable modes that involve negotiation. *Off* is not considered a valid PAgP channel establishment mode, as it refers to a state where the port is not participating in an Ether

The three PAgP (Port Aggregation Protocol) channel establishment modes include Auto, Desirable, and On. PAgP is a Cisco proprietary protocol used to manage EtherChannel configurations between switches.

In Auto mode, the switch port will respond to PAgP packets from other switches but will not initiate PAgP negotiation. This means that while a port in Auto mode will accept an EtherChannel connection if another port is in Desirable mode or another Auto mode, it does not actively try to form an EtherChannel.

Desirable mode, on the other hand, actively initiates PAgP negotiation by sending PAgP packets and facilitates the creation of an EtherChannel with compatible ports. This mode is commonly used for connecting to another switch where an EtherChannel is desired.

Although On is a channel establishment mode, it actually forces the interface to become part of an EtherChannel without using PAgP or any negotiation. The system will not attempt to dynamically form a channel with other devices, which makes it different from Auto and Desirable modes that involve negotiation.

Off is not considered a valid PAgP channel establishment mode, as it refers to a state where the port is not participating in an Ether