JN0-106 Operational Monitoring and Maintenance Practice Question
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?
⚠ Common exam trap
Test-takers frequently 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.
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
✓
Configure event-options to trigger on interface down and send syslog
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.
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
Junos event-options provide a policy-based framework that monitors for interface down (and up) events in real time, and when triggered, can send a syslog message to a remote server. This is fully automatic and requires no active SSH session on the device, because the Junos device itself evaluates the event and forwards the syslog to a collector. By capturing the event at the moment it occurs, even brief flaps are recorded reliably, making this the preferred method for logging interface state changes in a network environment.
- ✗
Use 'monitor interface ge-0/0/0' and rely on terminal persistence
Why it's wrong here
The 'monitor interface ge-0/0/0' command displays real-time interface statistics and status updates in an interactive terminal, but its output is only visible while that terminal session is open. Relying on terminal persistence, such as a terminal emulator's scrollback or a multiplexer, still requires the SSH connection to remain active; if the connection drops or the administrator stops watching, the flapping events are not captured or logged. Moreover, this command does not produce a persistent records of state changes — it merely shows a live snapshot, so intermittent flaps are easily missed.
- ✗
Use 'monitor start' to capture logs
Why it's wrong here
The 'monitor start' command streams the contents of log files to the terminal, typically showing syslog messages generated by the device, but it is purely a live output mechanism. The data is sent only over the active SSH session, and if that session terminates, the log stream stops and no copy is retained on the device unless the log was already being written to a file by other means. Therefore, this approach still requires an active SSH session to receive the data, and it does not inherently record the interface flap event in an easily accessible way without additional configuration.
- ✗
Schedule a cron job to run 'show interfaces ge-0/0/0' every minute and log output
Why it's wrong here
A cron job that runs 'show interfaces ge-0/0/0' every minute from a remote server depends on the remote server being able to establish an SSH session to the Junos device at each scheduled run. This polling interval is far too coarse to catch multiple interface flaps that occur within the same minute, so a brief down/up transition can easily slip between polls and never be logged. Additionally, the approach requires the SSH connection to be available during the poll, which may fail if the interface or the management path is temporarily down — exactly the situation being investigated.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This JN0-106 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 JN0-106 exam.