20+ practice questions focused on Junos Configuration Basics — one of the most tested topics on the Juniper Networks Certified Associate Junos JNCIA-Junos exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Junos Configuration Basics PracticeA network engineer is configuring a new Juniper device. They intend to apply a firewall filter to an interface to only allow SSH traffic from a specific management subnet. Which configuration approach best follows Juniper best practices?
Explanation: To restrict SSH access to the device, the filter should be applied to the loopback interface (lo0) because all local control-plane traffic is received on lo0. Applying to a single physical interface (ge-0/0/0) only filters traffic on that interface and does not protect SSH access from other interfaces. The correct configuration is: define the filter under 'firewall family inet' and apply it under 'interfaces lo0 unit 0 family inet filter input filter-name'.
A junior engineer is asked to change the hostname of a Juniper device from 'Router-1' to 'Core-Router'. Which command sequence correctly commits the change?
Explanation: A, B, and D are all valid ways to change the hostname and commit. A and D use the full path 'set system host-name Core-Router; commit' from the top of configuration mode. B uses 'edit system' to enter the [edit system] hierarchy, then 'set host-name Core-Router; commit' — this is also valid because 'set host-name' is interpreted relative to [edit system] and commit commits the candidate configuration. Option C is invalid because the Junos statement is 'host-name', not 'hostname'.
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?
Explanation: 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.
When configuring a new Juniper router, an engineer needs to ensure that configuration changes are not automatically committed after a certain time if not explicitly confirmed. Which configuration parameter controls this?
Explanation: The 'commit confirmed' command is used to apply a configuration change that will automatically roll back to the previous configuration if not explicitly confirmed within a specified time period (default 10 minutes). This ensures that changes are not permanently applied unless the engineer verifies them, preventing accidental lockout or misconfiguration.
A network administrator wants to view the current candidate configuration that has not yet been committed. Which command should be used?
Explanation: The candidate configuration is the configuration being edited but not yet committed. To view it, you must be in configuration mode and use the 'show' command. The 'show configuration' command is used in operational mode to display the active committed configuration. Therefore, none of the provided options is correct.
+15 more Junos Configuration Basics questions available
Practice all Junos Configuration Basics questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Junos Configuration Basics. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Junos Configuration Basics questions on the JN0-106 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Junos Configuration Basics is tested as part of the Juniper Networks Certified Associate Junos JNCIA-Junos blueprint. Practicing with targeted Junos Configuration Basics questions ensures you can handle any format or difficulty that appears.
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