Quick Answer
The answer is the `show bgp summary` command. This is the correct choice because it provides a concise, single-line-per-peer overview of all BGP sessions, displaying the peer IP address, autonomous system number, and the current session state—most critically, whether that state is “Established.” On the JNCIA-Junos exam, this question tests your ability to quickly verify BGP peering status without parsing the verbose output of `show bgp neighbor`. A common trap is confusing this command with `show bgp neighbor`, which gives detailed per-peer information but is not designed for a quick summary. To remember, think of the word “summary” as your shortcut: you want a summary of all neighbors, not a deep dive into one. A useful memory tip is to associate the “s” in “summary” with “snapshot” of all sessions—one glance tells you if every peer is Established.
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.
An administrator wants to verify that BGP neighbors are established. Which command provides a summary of all BGP peer sessions?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
show bgp neighbor
Why wrong: Shows detailed neighbor info per peer.
show bgp summary
Provides a summary of BGP peer sessions.
show interfaces terse
Why wrong: Shows interface status.
show route protocol bgp
Why wrong: Shows BGP routes, not peer status.
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 bgp summary
The 'show bgp summary' command is correct because it provides a concise, one-line-per-peer overview of all BGP sessions, including the peer IP address, AS number, state (e.g., Established), and counters for prefixes received. This is the standard command in Junos for quickly verifying that all BGP neighbors are in the Established state without the detailed per-neighbor output.
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 bgp neighbor
Why it's wrong here
Shows detailed neighbor info per peer.
show bgp summary
Why this is correct
Provides a summary of BGP peer sessions.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
show interfaces terse
Why it's wrong here
Shows interface status.
show route protocol bgp
Why it's wrong here
Shows BGP routes, not peer status.
Common exam traps
The trap here is that candidates familiar with Cisco IOS might expect 'show ip bgp summary' but mistakenly choose 'show bgp neighbor' because they confuse the detailed neighbor output with a summary view, or they overlook that Junos uses 'show bgp summary' for the aggregated peer list.
Trap categories for this question
Command / output trap
Shows detailed neighbor info per peer.
Detailed technical explanation
The 'show bgp summary' output includes the 'State/PfxRcd' column, which shows 'Established' (or the number of prefixes received) for active peers, and 'Idle', 'Active', 'Connect', 'OpenSent', 'OpenConfirm' for non-established sessions. In Junos, BGP session state transitions follow RFC 4271, and this command is essential for quickly identifying flapping or down peers in production networks, especially when monitoring large-scale iBGP or eBGP deployments.
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 bgp summary — The 'show bgp summary' command is correct because it provides a concise, one-line-per-peer overview of all BGP sessions, including the peer IP address, AS number, state (e.g., Established), and counters for prefixes received. This is the standard command in Junos for quickly verifying that all BGP neighbors are in the Established state without the detailed per-neighbor output.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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