Refer to the exhibit.

Assuming this NFAS-enabled T1 PRI configuration on a Cisco IOS router is fully functional, what will
the controller T1 1/1 D-channel status be in the output of the show isdn status command?

A.
MULTIPLE_FRAME_ESTABLISHED

B.
TEI_ASSIGNED

C.
AWAITING_ESTABLISHMENT

D.
STANDBY

E.
INITIALIZED

Explanation:
TEI_ASSIGNED, which indicates that the PRI does not exchange Layer 2 frames with the switch. Use
the show controller t1 x command to first check the controller t1 circuit, and verify whether it is
clean (that is, it has no errors) before you troubleshoot ISDN Layer 2 problem with the debug isdn
q921.