What is the status of a Layer 2 interface when it is disabled?

What is the status of a Layer 2 interface when it is disabled?

• A. Up/up
• B. Down/down
• C. Up/down
• D. Administratively down

Answer: (D)

When a Layer 2 interface is disabled, it is in the "administratively down" state. This means that the interface has been intentionally disabled by a network administrator through configuration commands, such as the "shutdown" command on a Cisco device. In this state, the interface will not send or receive any traffic, and it is effectively non-operational. The "administratively down" status indicates that while the hardware itself may be functional, the configuration has set it to a disabled state. This status is important for network management, allowing administrators to control which interfaces are active and participating in the network. Other states, such as "up/up" or "down/down," indicate that the interface may be physically connected and operational or experiencing issues, respectively. However, in the case of a disabled interface, the configuration takes precedence, leading to its "administratively down" status.

When a Layer 2 interface is disabled, it is in the "administratively down" state. This means that the interface has been intentionally disabled by a network administrator through configuration commands, such as the "shutdown" command on a Cisco device. In this state, the interface will not send or receive any traffic, and it is effectively non-operational.

The "administratively down" status indicates that while the hardware itself may be functional, the configuration has set it to a disabled state. This status is important for network management, allowing administrators to control which interfaces are active and participating in the network.

Other states, such as "up/up" or "down/down," indicate that the interface may be physically connected and operational or experiencing issues, respectively. However, in the case of a disabled interface, the configuration takes precedence, leading to its "administratively down" status.