- A
rpd: Handles routing protocols such as OSPF and BGP.
rpd (Routing Protocol Daemon) is responsible for running routing protocols and maintaining the routing table.
- B
mgd: Provides the CLI and XML API for configuration.
mgd (Management Daemon) is the interface between the user and the Junos configuration, handling CLI commands and API requests.
- C
dcd: Manages physical interface properties.
dcd (Device Control Daemon) controls physical attributes of interfaces like link state, speed, and duplex.
- D
chassisd: Monitors chassis hardware components.
chassisd (Chassis Daemon) monitors the hardware environment, including fans, power supplies, and temperature sensors.
- E
rpd: Monitors chassis hardware.
Why wrong: Incorrect — this describes chassisd, not rpd. rpd handles routing protocols.
- F
mgd: Handles routing protocols.
Why wrong: Incorrect — this describes rpd, not mgd. mgd provides the management interface.
Understanding Key Junos Daemon Processes and Their Functions
This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. 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.
Match each Junos software process to its role.
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
rpd: Handles routing protocols such as OSPF and BGP.
In Junos, each daemon has a specific role: rpd manages routing protocols, mgd provides CLI/API management, dcd controls physical interfaces, and chassisd monitors chassis hardware. Confusing these roles is common.
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.
- ✓
rpd: Handles routing protocols such as OSPF and BGP.
Why this is correct
rpd (Routing Protocol Daemon) is responsible for running routing protocols and maintaining the routing table.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
mgd: Provides the CLI and XML API for configuration.
Why this is correct
mgd (Management Daemon) is the interface between the user and the Junos configuration, handling CLI commands and API requests.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
dcd: Manages physical interface properties.
Why this is correct
dcd (Device Control Daemon) controls physical attributes of interfaces like link state, speed, and duplex.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
chassisd: Monitors chassis hardware components.
Why this is correct
chassisd (Chassis Daemon) monitors the hardware environment, including fans, power supplies, and temperature sensors.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
rpd: Monitors chassis hardware.
Why it's wrong here
Incorrect — this describes chassisd, not rpd. rpd handles routing protocols.
- ✗
mgd: Handles routing protocols.
Why it's wrong here
Incorrect — this describes rpd, not mgd. mgd provides the management interface.
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?
Junos Configuration Basics — This question tests Junos Configuration Basics — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: rpd: Handles routing protocols such as OSPF and BGP. — In Junos, each daemon has a specific role: rpd manages routing protocols, mgd provides CLI/API management, dcd controls physical interfaces, and chassisd monitors chassis hardware. Confusing these roles is common.
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.
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Last reviewed: Jun 11, 2026
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