JN0-106 Routing Fundamentals Practice Question
Exhibit
user@router> show configuration routing-options static | display set set routing-options static route 10.1.1.0/24 qualified-next-hop 192.168.1.1 preference 10 set routing-options static route 10.1.1.0/24 qualified-next-hop 192.168.2.1 preference 20
Refer to the exhibit. If the primary next-hop (192.168.1.1) becomes unreachable, what will happen to the route?
⚠ Common exam trap
Test-takers frequently assume a route is removed or hidden when a next-hop fails, but Junos maintains the route and uses the backup next-hop, unlike some other vendors that may withdraw the route entirely.
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 secondary next-hop (192.168.2.1) will be used.
In Junos, when a route has multiple next-hops configured (e.g., primary and secondary), the secondary next-hop serves as a backup. If the primary next-hop (192.168.1.1) becomes unreachable, Junos automatically fails over to the secondary next-hop (192.168.2.1) without removing the route from the routing table. This behavior is controlled by the 'next-hop' configuration under a static route or via routing protocol policies, ensuring continuous reachability.
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 route is removed from the routing table.
Why it's wrong here
Junos does not withdraw the static route from the routing table just because its primary next-hop is unreachable. Because the route has a configured secondary next-hop (192.168.2.1) that is still resolvable, the RIB keeps the route as a valid, active entry; removal would only happen if all next-hops became invalid and no fallback existed.
- ✗
The route remains but with the primary next-hop marked as unreachable.
Why it's wrong here
While the primary next-hop loses reachability, Junos does not retain it in the RIB as a marked-unreachable entry. Instead, the routing table actively replaces the unusable primary next-hop with the secondary next-hop, so the active route entry's next-hop is updated to 192.168.2.1, not left flagged as unreachable alongside the primary.
- ✓
The secondary next-hop (192.168.2.1) will be used.
Why this is correct
When the primary next-hop (192.168.1.1) becomes unreachable, Junos automatically selects the secondary next-hop (192.168.2.1) as the active forwarding next-hop because the secondary is configured as the fallback and is still valid. The route remains installed in the routing table and is forwarded via the secondary next-hop until the primary recovers and is preferred again.
- ✗
The route becomes hidden.
Why it's wrong here
A route becomes hidden in Junos when it is suppressed from the active routing table, usually because no valid next-hop or outbound interface can be resolved, or because a routing policy rejects it. In this scenario, the secondary next-hop resolves correctly, so the route is neither hidden nor suppressed; it remains visible and fully usable in traffic forwarding.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This JN0-106 practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JN0-106 exam.