QCM avec cases à cocher

» Cisco » Examen Cisco CCNA V3.1 » Module 2 » Chapitre 9 » Question /23

14.After issuing the show interfaces command, a technician notices the line "Serial1 is down, line protocol is down" in the output. Which of the following are possible reasons for this message output? (Choose three.)

There is a mismatch in the encapsulation type on both ends of the link.
A Layer 1 issue exists.
An interface problem exists.
The clockrate was not set during configuration.
There is no usable media for the protocol.
Keepalive messages are not being sent.