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.
When configuring OSPF on a Juniper router, an engineer applies the 'area 0.0.0.0 interface ge-0/0/1.0 passive' command. What is the effect of this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The interface will not send OSPF hellos, but the connected network will still be advertised in OSPF.
The 'passive' configuration on an OSPF interface in Junos prevents the interface from sending OSPF Hello packets, which stops the formation of neighbor adjacencies. However, the interface's connected network prefix is still advertised as a stub network in OSPF Type 1 LSAs, ensuring reachability to that subnet without dynamic neighbor relationships.
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.
✗
The interface will not be advertised in OSPF at all, and no OSPF traffic will be transmitted.
Why it's wrong here
Passive interfaces still advertise the network.
✗
The interface will only accept incoming OSPF packets but will not send any.
Why it's wrong here
Passive interfaces do not send hellos, but they also do not respond to them.
✓
The interface will not send OSPF hellos, but the connected network will still be advertised in OSPF.
Read the scenario before looking for a memorised answer.
✗
The interface will actively send OSPF hellos and attempt to form adjacencies.
Why it's wrong here
Passive means no hellos are sent.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'passive' with 'disable' or assume it blocks all OSPF traffic, when in fact it only stops Hello transmission while still advertising the network.
Detailed technical explanation
How to think about this question
In Junos, the 'passive' interface configuration is equivalent to setting 'interface ... passive' in the OSPF protocol stanza, which suppresses Hello transmission but still includes the interface's prefix in router LSAs. This is commonly used for loopback interfaces or stub networks where you want to advertise the subnet without forming adjacencies, reducing OSPF overhead and preventing unnecessary neighbor relationships on point-to-point links.
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 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
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: The interface will not send OSPF hellos, but the connected network will still be advertised in OSPF. — The 'passive' configuration on an OSPF interface in Junos prevents the interface from sending OSPF Hello packets, which stops the formation of neighbor adjacencies. However, the interface's connected network prefix is still advertised as a stub network in OSPF Type 1 LSAs, ensuring reachability to that subnet without dynamic neighbor relationships.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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