JN0-106 Operational Monitoring and Maintenance Practice Question
A network administrator is troubleshooting a routing issue and wants to view the routing table for a specific routing instance called 'VPN-A'. Which command should they use?
⚠ Common exam trap
The trap here is that candidates familiar with Cisco IOS might expect 'show ip route vrf VPN-A' and incorrectly apply similar syntax like 'show routing-table VPN-A' or 'show route instance VPN-A', not realizing Junos uses 'show route table <instance-name>' for the same purpose.
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 route table VPN-A
The correct command to view the routing table for a specific routing instance in Junos is 'show route table VPN-A'. This command displays the routes associated with the routing instance named 'VPN-A', which is essential for troubleshooting routing issues within that instance. The 'show route' command is the standard way to view routing tables, and specifying the 'table' keyword followed by the instance name targets the correct routing table.
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 routing-table VPN-A
Why it's wrong here
The Junos CLI does not accept 'show routing-table'; the correct operational verb is 'route', not 'routing-table'. The command should be 'show route table VPN-A' to display the routing tables of the VPN-A routing instance. The hyphenated form is not a valid keyword in Junos syntax, so this command will fail with a CLI parsing error rather than returning any route information.
- ✓
show route table VPN-A
Why this is correct
The 'show route table' command with the routing-instance name is the correct way to view all routes in that instance. In Junos, each routing instance has its own set of routing tables (e.g., VPN-A.inet.0), and specifying the instance name as the table argument displays all of its tables. This command shows the full routing table, including protocol preference, next-hop, and route flags.
- ✗
show route instance VPN-A
Why it's wrong here
The Junos CLI distinguishes between 'show route' for route lookup and 'show routing instance' for instance parameters. 'show route instance VPN-A' is invalid because the 'route' command does not take 'instance' as a subcommand; instead, use 'show route table VPN-A'. Conversely, 'show routing instance VPN-A' is a valid command for viewing instance configuration and status, but it does not display routes.
- ✗
show routing instance VPN-A route
Why it's wrong here
This command incorrectly appends 'route' to 'show routing instance', which is a config- and status-oriented command. The valid form for displaying routes is 'show route table VPN-A', not 'show routing instance ... route'. Junos commands are verb-noun oriented: 'show routing instance' is one complete command, and adding 'route' at the end is not a recognized modifier, causing a syntax error.
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