Quick Answer
The answer is that the 'monitor interface' command can be terminated with Ctrl+C. This is correct because the command provides real-time statistics for a specified interface, continuously updating counters such as packets, errors, and bandwidth utilization until the user manually stops the session. On the JNCIA-Junos exam, this question tests your understanding of operational monitoring commands versus static show commands; a common trap is confusing 'monitor interface' with 'show interface', which outputs a single snapshot. Remember that 'monitor' implies a live, dynamic feed—think of it as a live dashboard you must exit with Ctrl+C, not a report you wait to finish. A helpful memory tip: "Monitor is live, Ctrl+C to survive."
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO statements are correct about the 'monitor interface' command?
It displays output in real-time
Continuously updates with new data.
It shows a static snapshot
Why wrong: It is dynamic, not static.
It can be terminated with Ctrl+C
Standard way to stop monitoring.
It requires a 'start' parameter
Why wrong: It starts immediately without 'start'.
It provides historical statistics
Why wrong: Shows current data, not historical.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It displays output in real-time
The 'monitor interface' command in Junos OS displays real-time statistics for the specified interface, updating continuously until the user terminates it. This is why option A is correct: it provides a live, dynamic view of interface counters like packets, errors, and bandwidth utilization.
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.
It displays output in real-time
Why this is correct
Continuously updates with new data.
Related concept
Read the scenario before looking for a memorised answer.
It shows a static snapshot
Why it's wrong here
It is dynamic, not static.
It can be terminated with Ctrl+C
Why this is correct
Standard way to stop monitoring.
Related concept
Read the scenario before looking for a memorised answer.
It requires a 'start' parameter
Why it's wrong here
It starts immediately without 'start'.
It provides historical statistics
Why it's wrong here
Shows current data, not historical.
Common exam traps
The trap here is that candidates confuse 'monitor interface' with 'show interface' — the former is real-time and continuous, while the latter provides a static snapshot at a single point in time.
Trap categories for this question
Command / output trap
Shows current data, not historical.
Detailed technical explanation
Under the hood, 'monitor interface' uses the Junos event-driven polling mechanism to fetch interface counters at a default interval of one second, displaying delta values since the last update. This is useful for troubleshooting transient issues like intermittent packet loss or microbursts, where static snapshots would miss the problem. The command can be terminated with Ctrl+C, which sends an interrupt signal to stop the monitoring session.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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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: It displays output in real-time — The 'monitor interface' command in Junos OS displays real-time statistics for the specified interface, updating continuously until the user terminates it. This is why option A is correct: it provides a live, dynamic view of interface counters like packets, errors, and bandwidth utilization.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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