Quick Answer
The answer is the `monitor interface traffic` command, because it provides real-time interface statistics by continuously updating traffic counters on the screen, allowing you to observe live changes in packet and byte rates as they occur. Unlike static commands like `show interfaces` which give a single snapshot, or `show interfaces extensive` which offers detailed but fixed output, the `monitor interface traffic` command refreshes dynamically, making it essential for troubleshooting high latency or intermittent issues on a link. On the JNCIA-Junos exam, this question tests your ability to distinguish between operational monitoring commands—a common trap is confusing the static `show` commands with the dynamic `monitor` family. Remember that `monitor` always implies a live, updating view, while `show` is a point-in-time report. A helpful memory tip: think of `monitor` as a live video feed and `show` as a single photograph.
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A network administrator is troubleshooting high latency on a link. Which command provides real-time interface statistics?
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.
show interfaces extensive
Why wrong: Shows detailed static statistics.
monitor interface traffic
Provides real-time bandwidth utilization and packet counts.
show interfaces terse
Why wrong: Shows a static summary of interface status.
show log messages
Why wrong: Displays log messages, not real-time interface stats.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
monitor interface traffic
Option B is correct because 'monitor interface traffic' shows live traffic statistics. Option A shows a static brief summary. Option C shows detailed but static output. Option D shows historical log messages.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
show interfaces extensive
Why it's wrong here
Shows detailed static statistics.
monitor interface traffic
Why this is correct
Provides real-time bandwidth utilization and packet counts.
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.
show interfaces terse
Why it's wrong here
Shows a static summary of interface status.
show log messages
Why it's wrong here
Displays log messages, not real-time interface stats.
Common exam traps
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
Shows detailed static statistics.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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.
Operational Monitoring and Maintenance — study guide chapter
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Operational Monitoring and Maintenance practice questions
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FAQ
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — Read the scenario before looking for a memorised answer..
The correct answer is: monitor interface traffic — Option B is correct because 'monitor interface traffic' shows live traffic statistics. Option A shows a static brief summary. Option C shows detailed but static output. Option D shows historical log messages.
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.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This JNCIA-JUNOS practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIA-JUNOS exam.
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