JN0-106 Operational Monitoring and Maintenance Practice Question
An engineer needs to check the current system uptime on a Juniper device running Junos OS. Which command should they use?
⚠ Common exam trap
Watch out — candidates often confuse 'show system uptime' with similar-sounding commands from other vendors (like Cisco's 'show version' or 'show system status'), leading them to select a non-existent or incorrect Junos command.
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
✓
show system uptime
The correct command to check current system uptime on a Juniper device running Junos OS is 'show system uptime'. This command displays the time since the system was last booted, as well as the current time and the time since the routing protocol process (rpd) started. It is the standard operational command for this specific metric.
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 system status
Why it's wrong here
The command 'show system status' is not a valid operational command in the Junos CLI. While many network operating systems (e.g., Cisco IOS) use 'show system status' or similar, Junos has a distinct hierarchical command set. Issuing this command on a Junos device returns an error indicating an unrecognized command, so it cannot display uptime or any other system information.
- ✗
show system health
Why it's wrong here
Junos does not provide a 'show system health' command in its operational mode. The closest valid commands for hardware health checks are 'show chassis environment' for temperature/voltage/fan status and 'show chassis hardware' for inventory. Since this command does not exist, it cannot be used to retrieve system uptime.
- ✗
show system resources
Why it's wrong here
'show system resources' is a valid Junos command, but it displays memory and CPU utilization statistics, not the system uptime. It reports the amount of physical and virtual memory used and available, along with CPU load percentages. Uptime information is not part of this command's output, making it an incorrect choice for this task.
- ✓
show system uptime
Why this is correct
The correct term for checking uptime on Junos is 'show system uptime'. This operational command presents the current time, how long the system has been running, and load average figures. It also shows the number of users logged in, making it the standard tool for verifying system availability in Junos troubleshooting and monitoring workflows.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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JA
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.