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What could be possible causes for the "Serial0/0 is down" interface status?

What could be possible causes for the “Serial0/0 is down” interface status? (Choose two.)

ccna_1

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A.
A Layer 1 problem exists.

B.
The bandwidth is set too low.

C.
A protocol mismatch exists.

D.
An incorrect cable is being used.

E.
There is an incorrect IP address on the Serial 0/0 interface.

42 Comments on “What could be possible causes for the "Serial0/0 is down" interface status?

  1. mr_tienvu says:

    Layer 3 routing is needed to implement communication between VLANs, so a trunk link is configured between ROuter and Switch2. Both Switchl and Switch2own VLAN3 and VLAN4 members, so a trunk link is configured between Switchl and Switch2.




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  2. A real ccna says:

    First of all for those who do not know one of THE MOST BASICS about reading the status of an interface, “Serial 0/0 is down” automatically signifies a Layer 1 issue. Every cisco admin knows that the IF status is broken into 2 parts, “Serial 0/0 is down” means that there is some type of PHYSICAL problem, and if it did matter for this question WHICH IT DOES NOT BECAUSE YOU CANNOT HAVE A LAYER 2 PROBLEM IF LAYER 1 IS NOT WORKING, “Line protocol is down” means that there is a LAYER 2 PROBLEM.

    So obviously you can eliminate B, C, and E because NONE OF THOSE WILL WORK WITHOUT LAYER 1 CONNECTIVITY. Jesus christ. READ…..




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  3. George says:

    A serial connection can be down for:
    No clock <—- Layer 2 Issue
    Encapsulation mismatch <—- Layer 2 Issue
    Admin down <—- Not any layer issue, Turned Off.

    None of these apply to an interface that is Down/Down

    If the interface is admin'd down, it will read "administratively down, line protocol is down"

    No Clock = Serial0/0 is up, line protocol is down (disabled)

    Encapsulation mismatch = Serial0/0 is up, line protocol is down (disabled)




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