The answer is to configure event-options to trigger on interface down and send syslog. This approach is correct because Junos event-options allows you to define an event policy that monitors for a specific condition—such as an interface flapping or transitioning to a down state—and then automatically executes an action like generating a syslog message, all without requiring an active SSH session. This makes it ideal for event-driven interface monitoring when the router is remote and connectivity is intermittent, as the administrator can later review the logged events. On the JNCIA-Junos exam, this scenario tests your understanding of asynchronous monitoring versus synchronous methods like continuous polling or manual SSH checks; a common trap is choosing SNMP traps, but event-options is the native Junos mechanism for reacting to local events. Remember the memory tip: “Event-options catches the flap without the SSH gap.”
JNCIA-JUNOS Operational Monitoring and Maintenance Practice Question
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An administrator suspects that an interface is flapping but the router is remote and the connection is intermittent. The administrator wants to monitor the interface status without maintaining an SSH session. Which approach should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure event-options to trigger on interface down and send syslog
Option A is correct because Junos event-options allows you to define an event policy that triggers on a specific event, such as an interface down transition, and then executes an action like sending a syslog message. This enables asynchronous monitoring without requiring an active SSH session, making it ideal for intermittent connectivity scenarios.
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.
✓
Configure event-options to trigger on interface down and send syslog
Why this is correct
Logs events remotely without requiring an active SSH session.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use 'monitor interface ge-0/0/0' and rely on terminal persistence
Why it's wrong here
Terminal persistence is unreliable for intermittent connections.
✗
Use 'monitor start' to capture logs
Why it's wrong here
Still requires an active SSH session to receive the output.
✗
Schedule a cron job to run 'show interfaces ge-0/0/0' every minute and log output
Why it's wrong here
Requires SSH access and may miss events between polls.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse real-time monitoring commands like 'monitor interface' with persistent event-driven monitoring, assuming that terminal persistence or log capture can substitute for an event-based solution that works without an active session.
Trap categories for this question
Command / output trap
Still requires an active SSH session to receive the output.
Detailed technical explanation
How to think about this question
Junos event-options uses a policy framework where you define an 'event' (e.g., 'interface-down') and an 'action' (e.g., 'syslog message' or 'upload file'). The event is matched against the system's eventd daemon, which monitors interface state transitions. In real-world scenarios, this allows operators to log flapping events to a remote syslog server, enabling post-failure analysis even when the router is unreachable.
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.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure event-options to trigger on interface down and send syslog — Option A is correct because Junos event-options allows you to define an event policy that triggers on a specific event, such as an interface down transition, and then executes an action like sending a syslog message. This enables asynchronous monitoring without requiring an active SSH session, making it ideal for intermittent connectivity scenarios.
What should I do if I get this JNCIA-JUNOS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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