Quick Answer
The answer is the `clear bgp all` command. This is correct because in Junos, `clear bgp all` resets every BGP session by flushing the BGP routing table and forcing the protocol to re-establish all peering relationships from scratch, sending new OPEN messages and triggering a full route exchange. On the JNCIA-Junos exam, this question tests your understanding of operational mode commands for BGP session management, and a common trap is confusing it with `clear bgp` followed by a specific neighbor IP, which only clears a single session. Remember that the keyword "all" is the key to resetting every adjacency at once, making it the go-to command when a technician needs to clear all BGP sessions globally. A helpful memory tip: think of "all" as "annihilate and learn later"—it tears down everything so the router can rebuild all BGP relationships simultaneously.
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A network technician needs to clear all BGP sessions and force BGP to re-establish peering relationships. Which command should they use?
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.
clear bgp summary
Why wrong: Clears BGP summary statistics, not sessions.
clear bgp restart
Why wrong: Not a valid command.
clear bgp all
Clears all BGP sessions, causing re-establishment.
clear bgp statistics
Why wrong: Clears BGP statistics, not sessions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
clear bgp all
Option C is correct because the 'clear bgp all' command in Junos resets all BGP sessions by clearing the BGP routing table and forcing the protocol to re-establish peering relationships from scratch. This is the standard Junos command to tear down and restart all BGP adjacencies, triggering new OPEN messages and route exchanges.
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.
clear bgp summary
Why it's wrong here
Clears BGP summary statistics, not sessions.
clear bgp restart
Why it's wrong here
Not a valid command.
clear bgp all
Why this is correct
Clears all BGP sessions, causing re-establishment.
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.
clear bgp statistics
Why it's wrong here
Clears BGP statistics, not sessions.
Common exam traps
The trap here is that candidates familiar with Cisco IOS might expect 'clear ip bgp *' to be the equivalent, but Junos uses 'clear bgp all' instead, and the wrong options mimic Cisco-style commands that do not exist or have different effects in Junos.
Trap categories for this question
Command / output trap
Not a valid command.
Detailed technical explanation
Under the hood, 'clear bgp all' sends a TCP RST to each BGP peer, closes the TCP connection, and then initiates new TCP three-way handshakes followed by BGP OPEN messages. In a real-world scenario, this command is useful after changing BGP policies (e.g., import/export policies) to force immediate re-advertisement of routes without waiting for hold timers to expire.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the JNCIA-JUNOS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operational Monitoring and Maintenance — study guide chapter
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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: clear bgp all — Option C is correct because the 'clear bgp all' command in Junos resets all BGP sessions by clearing the BGP routing table and forcing the protocol to re-establish peering relationships from scratch. This is the standard Junos command to tear down and restart all BGP adjacencies, triggering new OPEN messages and route exchanges.
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
This JNCIA-JUNOS 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 JNCIA-JUNOS exam.
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