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GIAC GSNA Exam - Topic 3 Question 86 Discussion

You work as a Network Administrator for Net Perfect Inc. The company has a TCP/IP-based network environment. The network contains Cisco switches and a Cisco router. You run the following command for a router interface:show interface serial0You get the following output:Serial0 is administratively down, line protocol is downWhat will be your conclusion after viewing this output?
D) The interface is shut down.
A) There is a physical problem either with the interface or the cable attached to it.
B) The router has no power.
C) There is a problem related to encapsulation.

GIAC GSNA Exam - Topic 3 Question 86 Discussion

Actual exam question for GIAC's GSNA exam
Question #: 86
Topic #: 3
[All GSNA Questions]

You work as a Network Administrator for Net Perfect Inc. The company has a TCP/IP-based network environment. The network contains Cisco switches and a Cisco router. You run the following command for a router interface:

show interface serial0

You get the following output:

Serial0 is administratively down, line protocol is down

What will be your conclusion after viewing this output?

Show Suggested Answer Hide Answer
Suggested Answer: D

According to the question, the output displays that the interface is administratively down. Administratively down means that the interface is

shut down. In order to up the interface, you will have to open the interface with the no shutdown command.

Answer A is incorrect. Had there been a physical problem with the interface, the output would not have displayed 'administratively

down'. Instead, the output would be as follows:

serial0 is down, line protocol is down

Answer B is incorrect. You cannot run this command on a router that is powered off.

Answer C is incorrect. Encapsulation has nothing to do with the output displayed in the question.


by Rosendo at May 30, 2026, 07:39 PM

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Frederick
2 days ago
This reminds me of a practice question where the output showed similar terms. I think "administratively down" definitely points to the interface being shut down.
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William
7 days ago
I'm not entirely sure, but I feel like it could also be a physical issue. I need to double-check what "line protocol is down" really indicates.
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Joesph
12 days ago
I remember that "administratively down" usually means the interface has been manually disabled, so I think the answer is D.
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