Quick Answer
The answer is the `show bgp neighbor x.x.x.x` command. This is the correct choice because when BGP sessions are flapping and you suspect rejected routes from a prefix limit, this command immediately displays both the `received prefixes` and `accepted prefixes` counts side by side. A significant gap between these two numbers directly reveals that the import policy is dropping routes, often due to exceeding the configured `maximum-prefixes` limit, which triggers session flapping. On the JNCIA-Junos exam, this scenario tests your ability to differentiate between commands that show policy effects versus those that only show session state—a common trap is choosing `show bgp summary`, which hides the per-neighbor rejection detail. Remember the memory tip: “Received minus Accepted equals Rejected” — if you see a gap, check your prefix limit.
This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
During troubleshooting, an engineer notices that BGP sessions are flapping. They suspect that the issue might be related to the maximum number of routes allowed. To see if the BGP import policy is rejecting routes, which operational command would provide immediate insight?
show version
Why wrong: Shows software version, not BGP status.
show interfaces terse
Why wrong: Shows interface status, not BGP specific.
show route protocol bgp
Why wrong: Shows routes in the routing table, not why they were rejected.
show bgp neighbor x.x.x.x
Displays BGP neighbor details including prefix counts and policy statistics.
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 neighbor x.x.x.x
Option D is correct because the 'show bgp neighbor x.x.x.x' command displays detailed BGP session information, including the number of received and accepted routes, as well as any prefix-limit or policy-related rejections. If the BGP import policy is rejecting routes due to exceeding the maximum allowed, this command will show the 'received prefixes' count alongside the 'accepted prefixes' count, immediately revealing if routes are being dropped. This provides direct insight into whether the flapping is caused by route limit enforcement.
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 version
Why it's wrong here
Shows software version, not BGP status.
show interfaces terse
Why it's wrong here
Shows interface status, not BGP specific.
show route protocol bgp
Why it's wrong here
Shows routes in the routing table, not why they were rejected.
show bgp neighbor x.x.x.x
Why this is correct
Displays BGP neighbor details including prefix counts and policy statistics.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often think 'show route protocol bgp' will show all BGP routes including rejected ones, but it only shows routes that passed the import policy and were installed in the routing table, missing the critical rejection information that 'show bgp neighbor' provides.
Trap categories for this question
Command / output trap
Shows software version, not BGP status.
Detailed technical explanation
Under the hood, BGP import policies are evaluated per session, and Junos maintains separate counters for received, accepted, and rejected prefixes. The 'show bgp neighbor' command exposes these counters, including the 'prefix-limit' state (e.g., idle, active, or shutdown) if the limit is exceeded. In real-world scenarios, a misconfigured prefix limit or a sudden route leak can cause the session to flap repeatedly as the limit is hit and the session resets, making this command essential for rapid troubleshooting.
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
Junos Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
The correct answer is: show bgp neighbor x.x.x.x — Option D is correct because the 'show bgp neighbor x.x.x.x' command displays detailed BGP session information, including the number of received and accepted routes, as well as any prefix-limit or policy-related rejections. If the BGP import policy is rejecting routes due to exceeding the maximum allowed, this command will show the 'received prefixes' count alongside the 'accepted prefixes' count, immediately revealing if routes are being dropped. This provides direct insight into whether the flapping is caused by route limit enforcement.
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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