Show Interfaces Extensive: Detailed Interface Status and Errors
This JNCIA-JUNOS practice question tests your understanding of user interfaces. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. A key principle to apply: show interfaces extensive. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
user@router> show configuration interfaces ge-0/0/0
unit 0 {
family inet {
address 10.1.1.1/24;
}
}
Refer to the exhibit. The interface ge-0/0/0 is configured as shown, but the interface is operationally down. Which command would provide the most detailed information about the interface status and errors?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Exhibit
user@router> show configuration interfaces ge-0/0/0
unit 0 {
family inet {
address 10.1.1.1/24;
}
}
A
show interfaces ge-0/0/0
Why wrong: This shows basic interface status but not extensive details like errors.
B
show configuration interfaces ge-0/0/0
Why wrong: This shows the configuration, not operational status or errors.
C
show interfaces ge-0/0/0 terse
Why wrong: This shows a brief summary, not detailed error information.
D
show interfaces ge-0/0/0 extensive
This provides the most detailed interface information, including errors.
The answer is the `show interfaces ge-0/0/0 extensive` command. This is correct because the `extensive` modifier provides the most detailed interface status and errors, including granular physical layer state, media-specific error counters like CRC and alignment errors, and protocol-level operational flags that a basic `show interfaces` or `show interfaces terse` omits. On the JNCIA-Junos exam, this question tests your ability to differentiate between operational commands for troubleshooting—a common trap is choosing `show configuration interfaces` (which only shows the config, not live status) or `show interfaces brief` (which lacks error detail). Remember that Junos uses `extensive` as the deepest diagnostic level for interfaces, similar to how `detail` works for routing tables. A quick memory tip: think "Extensive = Everything, Errors, and Electrical state" to recall it gives the full picture when an interface is down.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
show interfaces ge-0/0/0 extensive
Option D is correct because `show interfaces ge-0/0/0 extensive` provides the most detailed operational information, including error counters, physical state, and protocol details. Option A (`show interfaces ge-0/0/0`) shows a brief summary. Option B (`show configuration interfaces ge-0/0/0`) shows the configuration, not operational status. Option C (`show interfaces ge-0/0/0 terse`) shows a condensed output. Therefore, extensive is the best choice to diagnose why the interface is down.
Key principle: show interfaces extensive
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
show interfaces ge-0/0/0
Why it's wrong here
This shows basic interface status but not extensive details like errors.
✗
show configuration interfaces ge-0/0/0
Why it's wrong here
This shows the configuration, not operational status or errors.
✗
show interfaces ge-0/0/0 terse
Why it's wrong here
This shows a brief summary, not detailed error information.
✓
show interfaces ge-0/0/0 extensive
Why this is correct
This provides the most detailed interface information, including errors.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
show interfaces extensive
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
This shows basic interface status but not extensive details like errors.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
show interfaces extensive
Operational vs Configuration commands
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
show interfaces extensive
Real-world example
How this comes up in practice
A practitioner preparing for the JNCIA-JUNOS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. show interfaces extensive Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review show interfaces extensive, then practise related JNCIA-JUNOS questions on the same topic to reinforce the concept.
User Interfaces — This question tests User Interfaces — show interfaces extensive.
What is the correct answer to this question?
The correct answer is: show interfaces ge-0/0/0 extensive — Option D is correct because `show interfaces ge-0/0/0 extensive` provides the most detailed operational information, including error counters, physical state, and protocol details. Option A (`show interfaces ge-0/0/0`) shows a brief summary. Option B (`show configuration interfaces ge-0/0/0`) shows the configuration, not operational status. Option C (`show interfaces ge-0/0/0 terse`) shows a condensed output. Therefore, extensive is the best choice to diagnose why the interface is down.
What should I do if I get this JNCIA-JUNOS question wrong?
Review show interfaces extensive, then practise related JNCIA-JUNOS questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
show interfaces extensive
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