- A
The static route must have a lower preference than any dynamic route to the same prefix.
Why wrong: Preference determines which route is chosen among multiple routes to the same prefix, but does not affect resolution of the next-hop.
- B
The next-hop must have an ARP entry in the ARP table.
Why wrong: ARP is used for directly connected next-hops, not for recursive resolution.
- C
The next-hop 192.168.1.1 must be reachable via an active route (e.g., a direct or OSPF route).
Indirect next-hops require an active route to the next-hop address for the static route to be installed.
- D
The metric of the static route must be lower than that of any other route to the same prefix.
Why wrong: Metric is not considered for static route installation; it is used for tie-breaking among routes of the same protocol.
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.
A static route to 10.0.0.0/8 has next-hop 192.168.1.1. The route is not installed in the routing table. Which condition must be met for the route to become active?
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
The next-hop 192.168.1.1 must be reachable via an active route (e.g., a direct or OSPF route).
For a static route to be installed in the Junos routing table, its next-hop must be reachable via an active route in the routing table. This is because Junos performs recursive next-hop resolution: it looks up the next-hop IP address (192.168.1.1) in the routing table and requires a valid, active route (e.g., a directly connected or OSPF-learned route) to that address. Without this, the static route remains hidden and is not installed.
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 static route must have a lower preference than any dynamic route to the same prefix.
Why it's wrong here
Preference determines which route is chosen among multiple routes to the same prefix, but does not affect resolution of the next-hop.
- ✗
The next-hop must have an ARP entry in the ARP table.
Why it's wrong here
ARP is used for directly connected next-hops, not for recursive resolution.
- ✓
The next-hop 192.168.1.1 must be reachable via an active route (e.g., a direct or OSPF route).
Why this is correct
Indirect next-hops require an active route to the next-hop address for the static route to be installed.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The metric of the static route must be lower than that of any other route to the same prefix.
Why it's wrong here
Metric is not considered for static route installation; it is used for tie-breaking among routes of the same protocol.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the requirement for the next-hop to be reachable (a routing table condition) with Layer 2 resolution (ARP), leading them to incorrectly select Option B, but ARP is only used after the route is installed and the next-hop is determined to be reachable.
Detailed technical explanation
How to think about this question
Junos uses a two-step process for static route installation: first, the route is configured, then the next-hop address is resolved recursively through the routing table. If the next-hop is not reachable (e.g., the interface is down or there is no route to 192.168.1.1), the static route is placed in a 'hidden' state and does not appear in the forwarding table. This behavior is controlled by the 'resolve' parameter (default for static routes) and can be verified with 'show route protocol static hidden'.
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: The next-hop 192.168.1.1 must be reachable via an active route (e.g., a direct or OSPF route). — For a static route to be installed in the Junos routing table, its next-hop must be reachable via an active route in the routing table. This is because Junos performs recursive next-hop resolution: it looks up the next-hop IP address (192.168.1.1) in the routing table and requires a valid, active route (e.g., a directly connected or OSPF-learned route) to that address. Without this, the static route remains hidden and is not installed.
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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