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.
Explanation:
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
http://www.juniper.net/documentation/en_US/junos15.1/topics/task/verification/t1-statusdisplaying.html