Which of the following is a type of interface on a router that never goes down?
A. vty
B. console
C. loopback
D. subinterface
C
Explanation: A loopback interface is an interface on a router that can be given an IP address and it will function the same as a hardware interface. So what is the use of this interface? Well, unlike hardware interfaces loopback interfaces never go down. That means that as long as ANY of the hardware interfaces are functioning on the device you will be able to reach the loopback interface.
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