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.
JNCIA-JUNOS User Interfaces Practice Question
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. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
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 C is correct because `show interfaces extensive` provides detailed operational status, including error counters, physical state, and protocol information. Option A only shows a brief summary. Option B shows basic information but not as detailed as extensive. Option D shows the configuration, not operational status.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
Read the scenario before looking for a memorised answer.
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
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which JNCIA-JUNOS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
User Interfaces — This question tests User Interfaces — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: show interfaces ge-0/0/0 extensive — Option C is correct because `show interfaces extensive` provides detailed operational status, including error counters, physical state, and protocol information. Option A only shows a brief summary. Option B shows basic information but not as detailed as extensive. Option D shows the configuration, not operational status.
What should I do if I get this JNCIA-JUNOS question wrong?
Identify which JNCIA-JUNOS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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?
Read the scenario before looking for a memorised answer.
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