JN0-106 Junos Configuration Basics Practice Question
When configuring OSPF on a Juniper router, an engineer applies the 'area 0.0.0.0 interface ge-0/0/1.0 passive' command. What is the effect of this configuration?
⚠ Common exam trap
Watch out — candidates often confuse 'passive' with 'disable' or assume it blocks all OSPF traffic, when in fact it only stops Hello transmission while still advertising the network.
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 interface will not send OSPF hellos, but the connected network will still be advertised in OSPF.
The 'passive' configuration on an OSPF interface in Junos prevents the interface from sending OSPF Hello packets, which stops the formation of neighbor adjacencies. However, the interface's connected network prefix is still advertised as a stub network in OSPF Type 1 LSAs, ensuring reachability to that subnet without dynamic neighbor relationships.
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 interface will not be advertised in OSPF at all, and no OSPF traffic will be transmitted.
Why it's wrong here
Setting an OSPF interface as passive does not remove its connected subnet from OSPF; the prefix is still injected into the link-state database as a stub network and advertised to all neighbors. OSPF control-plane traffic is indeed suppressed on that interface — no hellos or other OSPF packets are sent — so the "no OSPF traffic" half is accurate, but the "not advertised at all" claim is false. Thus the statement is wrong.
- ✗
The interface will only accept incoming OSPF packets but will not send any.
Why it's wrong here
A passive OSPF interface does not merely stop sending hellos; it also ignores any OSPF packets that arrive, so it will not process incoming hellos, establish adjacencies, or respond to neighbor discovery. The interface is effectively silent at the OSPF protocol level, differing from a unidirectional outbound-only configuration. Since the option claims it still accepts incoming OSPF packets, it mischaracterizes the fully passive behavior.
- ✓
The interface will not send OSPF hellos, but the connected network will still be advertised in OSPF.
Why this is correct
The passive setting on an OSPF interface in Junos disables hello transmission on that interface, preventing the formation of any OSPF adjacency with a directly connected peer. However, the interface's subnet is still advertised as a stub network in the router's OSPF link-state advertisements, allowing other routers to learn the route without requiring a neighbor on that link. This matches the correct behavior for a passive interface.
- ✗
The interface will actively send OSPF hellos and attempt to form adjacencies.
Why it's wrong here
Configuring an OSPF interface as passive explicitly suppresses hello packets, so the interface will not attempt to discover neighbors, send database descriptors, or form any adjacency. In contrast, an interface left active (without the passive option) would indeed send hellos and attempt to form adjacencies, but that is what the passive command prevents. Therefore this option describes the opposite of the operational state created by passive configuration.
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.
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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.