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.
Exhibit
show route 10.10.10.0/24
inet.0: 4 destinations, 4 routes (3 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.10.10.0/24 *[OSPF/10] 00:12:34, metric 2
via ge-0/0/0.0
[Static/15] 00:05:00
to 192.168.1.1 via ge-0/0/0.0
Refer to the exhibit. Why is the static route not active?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The static route has a higher preference than the OSPF route.
Option C is correct because the static route has a preference of 15, which is higher than OSPF's preference of 10, making OSPF the active route. Option A is wrong because metric is not compared across protocols. Option B is wrong because the next-hop is reachable (via ge-0/0/0.0). Option D is wrong because the route is present in the table, so it is committed.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 OSPF route has a lower metric.
Why it's wrong here
Metric is only compared within OSPF, not across protocols.
✗
The static route's next-hop is not reachable.
Why it's wrong here
The next-hop 192.168.1.1 is shown as reachable via ge-0/0/0.0.
✗
The static route is not committed.
Why it's wrong here
The route is present in the routing table, so it has been committed.
✓
The static route has a higher preference than the OSPF route.
Why this is correct
Static preference 15 is higher (less preferred) than OSPF preference 10, so OSPF is active.
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Command / output trap
The next-hop 192.168.1.1 is shown as reachable via ge-0/0/0.0.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related JNCIA-JUNOS OSPF questions on adjacency and route selection.
Routing Fundamentals — This question tests Routing Fundamentals — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The static route has a higher preference than the OSPF route. — Option C is correct because the static route has a preference of 15, which is higher than OSPF's preference of 10, making OSPF the active route. Option A is wrong because metric is not compared across protocols. Option B is wrong because the next-hop is reachable (via ge-0/0/0.0). Option D is wrong because the route is present in the table, so it is committed.
What should I do if I get this JNCIA-JUNOS question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related JNCIA-JUNOS OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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