Quick Answer
The answer is the `show bgp summary`, `show isis adjacency`, and `show ospf neighbor` commands. These three commands are correct because they directly target the core operational task of monitoring routing protocol adjacencies—verifying that neighbor relationships are established and stable. On the JNCIA-Junos exam, this question tests your ability to distinguish between commands that check protocol state versus those that modify configuration or view routing tables; a common trap is confusing `show ospf interface` (which shows interface parameters) with `show ospf neighbor` (which shows adjacency state). For IS-IS, the `show isis adjacency` command displays the interface, system ID, and adjacency status (Up, Down, or Initializing), which is essential for confirming neighbor reachability. A reliable memory tip is to associate each protocol with its adjacency verb: BGP uses “summary” because it summarizes peers, OSPF uses “neighbor” because it’s a direct neighbor relationship, and IS-IS uses “adjacency” because it forms level-based adjacencies.
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 THREE commands are used for operational monitoring of routing protocols?
show isis adjacency
Shows IS-IS adjacencies.
show ospf neighbor
Shows OSPF neighbor state.
show interfaces terse
Why wrong: Shows interface status, not protocol.
show bgp summary
Shows BGP session status.
show arp
Why wrong: Shows ARP cache, not routing protocol.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
show isis adjacency
The 'show isis adjacency' command is used to verify the state of IS-IS neighbor adjacencies, which is a core operational monitoring task for the IS-IS routing protocol. It displays the interface, neighbor system ID, level, and adjacency state (e.g., Up, Down, Initializing), allowing an engineer to confirm that IS-IS neighbors are properly established.
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.
show isis adjacency
Why this is correct
Shows IS-IS adjacencies.
Related concept
Read the scenario before looking for a memorised answer.
show ospf neighbor
Why this is correct
Shows OSPF neighbor state.
Related concept
Read the scenario before looking for a memorised answer.
show interfaces terse
Why it's wrong here
Shows interface status, not protocol.
show bgp summary
Why this is correct
Shows BGP session status.
Related concept
Read the scenario before looking for a memorised answer.
show arp
Why it's wrong here
Shows ARP cache, not routing protocol.
Common exam traps
The trap here is that candidates may confuse general interface or Layer 2 monitoring commands (like 'show interfaces terse' or 'show arp') with protocol-specific operational monitoring commands, leading them to select options that do not actually show routing protocol state.
Trap categories for this question
Command / output trap
Shows interface status, not protocol.
Detailed technical explanation
IS-IS uses a two-level hierarchy (Level 1 and Level 2) and forms adjacencies over point-to-point or broadcast links. The 'show isis adjacency' command can also reveal the hold time and circuit type, which are critical for troubleshooting flapping adjacencies caused by mismatched hello intervals or authentication failures. In a real-world scenario, a missing adjacency might indicate a Layer 1 issue or a misconfigured ISO NET address.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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: show isis adjacency — The 'show isis adjacency' command is used to verify the state of IS-IS neighbor adjacencies, which is a core operational monitoring task for the IS-IS routing protocol. It displays the interface, neighbor system ID, level, and adjacency state (e.g., Up, Down, Initializing), allowing an engineer to confirm that IS-IS neighbors are properly established.
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
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