After issuing the show interfaces terse command, you notice that the status of one interface is -up down-. What does this indicate?

A. Layer 1 on the interface is up but Layer 2 is down.

B. Layer 2 on the interface is up but Layer 3 has not been configured.

C. The interface is administratively up but the link status is down.

D. The interface is up but has been administratively turned off.

The the administratively status is displayed in column 1, and the link status is displayed in column 2.

Example:

user@host> show interfaces terse t1*

Interface       Admin Link Proto Local                 Remote

t1-1/0/0        down  up — administratively disabled

t1-1/0/0.0      up    down inet  1.1.1.1/30

t1-1/0/1        up    down — physical layer down

References: http://www.juniper.net/documentation/en_US/junos15.1/topics/task/verification/t1-status-displaying.html