What is a characteristic of an IPv4 loopback interface on a Cisco IOS router?

Question:
What is a characteristic of an IPv4 loopback interface on a Cisco IOS router?

• The no shutdown command is required to place this interface in an UP state
• It is a logical interface internal to the router
• Only one loopback interface can be enabled on a router
• It is assigned to a physical port and can be connected to other devices

Explanation: The loopback interface is a logical interface internal to the router and is automatically placed in an UP state, as long as the router is functioning. It is not assigned to a physical port and can therefore never be connected to any other device. Multiple loopback interfaces can be enabled on a router.

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