The answer is to execute 'commit synchronize' on the primary node. This command is correct because it pushes the active configuration from node0 to node1 and commits it on both nodes simultaneously, resolving the configuration mismatch that caused node1 to become 'ineligible' without requiring a reboot or disrupting traffic. On the JNCIA-Junos exam, this scenario tests your understanding of Junos high-availability cluster operations, specifically how the primary node acts as the authoritative source for configuration synchronization. A common trap is attempting to commit on the secondary node or using 'request system reboot', which would cause unnecessary downtime. Remember the memory tip: "Primary pushes, secondary syncs" — always synchronize from the primary to restore cluster eligibility.
JNCIA-JUNOS Junos Configuration Basics Practice Question
This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company runs a Juniper SRX firewall cluster consisting of two nodes (node0 primary, node1 secondary). The cluster has been stable. During maintenance, you modify the configuration on node0 and commit. After the commit, the cluster status shows node1 as 'ineligible'. You suspect a configuration mismatch. What should you do to synchronize the configuration without disrupting traffic?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
On the primary node, execute 'commit synchronize'.
The 'commit synchronize' command on the primary node (node0) pushes the active configuration to the secondary node (node1) and commits it on both nodes, ensuring configuration consistency without requiring a reboot or traffic disruption. In a Juniper SRX cluster, the primary node is the authoritative source for configuration synchronization, and this command is the standard method to resolve a configuration mismatch that causes a node to become 'ineligible'.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
On the primary node, execute 'commit synchronize'.
Why this is correct
This synchronizes the configuration from primary to secondary.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reboot both nodes to force synchronization.
Why it's wrong here
Rebooting causes disruption and does not guarantee synchronization.
✗
Manually copy the configuration file from primary to secondary.
Why it's wrong here
Not efficient and may cause issues; commit synchronize is designed for this.
✗
On the secondary node, execute 'commit synchronize'.
Why it's wrong here
Synchronization should be initiated from the primary node.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think the secondary node can initiate synchronization (option D) or that a manual file copy (option C) is acceptable, but Juniper clusters require the primary to be the source of truth for configuration synchronization to maintain cluster integrity and avoid split-brain scenarios.
Detailed technical explanation
How to think about this question
In a Juniper SRX cluster, the control link (fab0/fab1) is used for inter-node communication, including configuration synchronization via the Junos 'commit synchronize' command, which uses the 'jsync' process to replicate the configuration database from the primary to the secondary. The 'ineligible' status indicates that the secondary node's configuration does not match the primary's, often due to a commit that was not synchronized; the 'commit synchronize' command ensures both nodes have identical configurations without requiring a reboot, as the cluster continues forwarding traffic through the primary during the process.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Junos Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: On the primary node, execute 'commit synchronize'. — The 'commit synchronize' command on the primary node (node0) pushes the active configuration to the secondary node (node1) and commits it on both nodes, ensuring configuration consistency without requiring a reboot or traffic disruption. In a Juniper SRX cluster, the primary node is the authoritative source for configuration synchronization, and this command is the standard method to resolve a configuration mismatch that causes a node to become 'ineligible'.
What should I do if I get this JNCIA-JUNOS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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