- A
Neither route becomes active due to conflicting protocols
Why wrong: Both routes are valid; the one with the lower preference becomes active.
- B
Both routes are active for ECMP load balancing
Why wrong: ECMP requires equal preference and metric; these routes have different preferences.
- C
Static route to 0.0.0.0/0 with next-hop 10.0.0.1
Static route has lower preference (10) and becomes active.
- D
OSPF route to 0.0.0.0/0
Why wrong: OSPF default route has higher preference (150), so it is not active.
Question 495 of 514
JNCIA-JUNOS Routing Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of routing fundamentals. 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 network administrator configures a default route using 'set routing-options static route 0.0.0.0/0 next-hop 10.0.0.1 preference 10' and later enables OSPF which also advertises a default route with default preference 150. Which route becomes active in the routing table?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Static route to 0.0.0.0/0 with next-hop 10.0.0.1
The static route has a preference of 10, which is lower than OSPF's default preference of 150. Junos uses the route with the lowest preference value as the active route in the routing table. Therefore, the static default route becomes active.
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.
- ✗
Neither route becomes active due to conflicting protocols
Why it's wrong here
Both routes are valid; the one with the lower preference becomes active.
- ✗
Both routes are active for ECMP load balancing
Why it's wrong here
ECMP requires equal preference and metric; these routes have different preferences.
- ✓
Static route to 0.0.0.0/0 with next-hop 10.0.0.1
Why this is correct
Static route has lower preference (10) and becomes active.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
OSPF route to 0.0.0.0/0
Why it's wrong here
OSPF default route has higher preference (150), so it is not active.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think OSPF always overrides static routes or that both routes can be used for ECMP, but Junos uses preference values to select a single active route, and ECMP only applies when preferences are equal.
Detailed technical explanation
How to think about this question
In Junos, route preference (administrative distance) determines which route is installed when multiple protocols provide the same prefix. The default preference for static routes is 5, but here it is explicitly set to 10, still lower than OSPF's default of 150. This ensures the static route is preferred. Note that if the static route's next-hop becomes unreachable, the OSPF default route would then become active, demonstrating Junos's route selection based on preference and next-hop reachability.
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.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
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 route to 0.0.0.0/0 with next-hop 10.0.0.1 — The static route has a preference of 10, which is lower than OSPF's default preference of 150. Junos uses the route with the lowest preference value as the active route in the routing table. Therefore, the static default route becomes active.
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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Last reviewed: Jul 4, 2026
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