- A
system: Configures system-wide parameters such as hostname and time.
The 'system' hierarchy is used for global system settings.
- B
system: Configures routing protocols like OSPF and BGP.
Why wrong: Incorrect — routing protocols are configured under 'protocols', not 'system'.
- C
interfaces: Configures physical and logical interfaces.
The 'interfaces' hierarchy is dedicated to interface configuration.
- D
interfaces: Configures security policies and zones.
Why wrong: Incorrect — security policies are configured under 'security', not 'interfaces'.
- E
protocols: Configures routing protocols like OSPF and BGP.
The 'protocols' hierarchy is used for routing protocol configuration.
- F
security: Configures firewall and security policies.
The 'security' hierarchy is used for firewall and security settings.
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.
Match each Junos configuration hierarchy to its function.
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
system: Configures system-wide parameters such as hostname and time.
In Junos, 'system' manages hostname and time, 'interfaces' configures ports, 'protocols' handles routing protocols, and 'security' manages firewall policies. Common confusions include swapping these definitions.
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.
- ✓
system: Configures system-wide parameters such as hostname and time.
Why this is correct
The 'system' hierarchy is used for global system settings.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
system: Configures routing protocols like OSPF and BGP.
Why it's wrong here
Incorrect — routing protocols are configured under 'protocols', not 'system'.
- ✓
interfaces: Configures physical and logical interfaces.
Why this is correct
The 'interfaces' hierarchy is dedicated to interface configuration.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
interfaces: Configures security policies and zones.
Why it's wrong here
Incorrect — security policies are configured under 'security', not 'interfaces'.
- ✓
protocols: Configures routing protocols like OSPF and BGP.
Why this is correct
The 'protocols' hierarchy is used for routing protocol configuration.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
security: Configures firewall and security policies.
Common exam traps
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.
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.
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
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.
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FAQ
Questions learners often ask
What does this JNCIA-JUNOS question test?
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: system: Configures system-wide parameters such as hostname and time. — In Junos, 'system' manages hostname and time, 'interfaces' configures ports, 'protocols' handles routing protocols, and 'security' manages firewall policies. Common confusions include swapping these definitions.
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.
About these practice questions
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Last reviewed: Jun 11, 2026
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