JNCIA-JUNOS Routing Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of routing fundamentals. 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.
Which TWO statements are true about static routes in Junos?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Static routes remain in the routing table even if the next hop is unreachable.
Static routes in Junos have a default preference of 5, not 10 (which is the default for OSPF internal routes). They remain in the routing table even if the next hop becomes unreachable because Junos uses a 'passive' route model; the route is only removed if explicitly deleted or if a better route is learned via a routing protocol. This behavior is controlled by the 'no-readvertise' and 'passive' attributes of static routes.
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.
✗
Static routes have a default preference value of 10.
Why it's wrong here
The default preference for static routes is 5, not 10.
✓
Static routes remain in the routing table even if the next hop is unreachable.
Why this is correct
Junos keeps static routes in the table; they are not removed automatically.
Related concept
Read the scenario before looking for a memorised answer.
✓
Static routes have a default preference value of 5.
Why this is correct
By default, static routes in Junos have a preference of 5.
Related concept
Read the scenario before looking for a memorised answer.
✗
Static routes require a routing protocol to be activated.
Why it's wrong here
Static routes are configured directly and do not need a routing protocol.
✗
Static routes are automatically updated if the network topology changes.
Why it's wrong here
Static routes are manually configured and do not dynamically update.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that Cisco candidates often assume static routes have a default preference of 1 (Cisco's administrative distance for static routes) or 10 (OSPF), but Junos uses 5, and they also mistakenly think static routes are removed when the next hop is unreachable, which is true in Cisco IOS but not in Junos without explicit configuration.
Detailed technical explanation
How to think about this question
In Junos, the 'passive' attribute of a static route means the route is always installed in the routing table regardless of next-hop reachability, unlike Cisco IOS where a static route is removed if the next hop is unreachable (unless configured with 'permanent'). This behavior is controlled by the 'routing-options static route' hierarchy; you can override it with 'no-passive' to remove the route when the next hop is down. In real-world scenarios, this is useful for backup routes where you want the route to persist even if the primary link fails, allowing policy-based routing or conditional default routes.
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.
Routing Fundamentals — This question tests Routing Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Static routes remain in the routing table even if the next hop is unreachable. — Static routes in Junos have a default preference of 5, not 10 (which is the default for OSPF internal routes). They remain in the routing table even if the next hop becomes unreachable because Junos uses a 'passive' route model; the route is only removed if explicitly deleted or if a better route is learned via a routing protocol. This behavior is controlled by the 'no-readvertise' and 'passive' attributes of static routes.
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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