The answer is that `network 10.0.0.0 0.255.255.255 area 0` activates OSPF on all interfaces within the 10.0.0.0/8 range using a wildcard mask, while `router-id 1.1.1.1` manually sets a persistent OSPF identifier, `passive-interface g0/0` suppresses hello packets to prevent neighbor formation while still advertising the subnet, and `neighbor 192.168.1.2` statically defines a peer on non-broadcast networks. These commands are correct because they directly match their specific OSPFv2 functions: the network statement enables OSPF per interface, the router-id overrides the default election process, passive-interface stops neighbor discovery without removing the route, and the neighbor command bypasses multicast hello limitations. On the CCNA 200-301 v2 exam, this drag-and-drop task tests your ability to distinguish between configuration and verification commands—a common trap is confusing `show ip ospf neighbor` (a verification command) with `neighbor` (a configuration command). Remember the memory tip: “Network enables, router-id identifies, passive silences, neighbor statically ties.”
CCNA IP Routing Practice Question
This 200-301 practice question tests your understanding of ip routing. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Drag and drop the OSPFv2 commands on the left to their correct descriptions on the right.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
router ospf 1
The `network 10.0.0.0 0.255.255.255 area 0` command activates OSPF on any interface with an IP in the 10.0.0.0/8 range (wildcard mask 0.255.255.255) and assigns it to area 0. `router-id 1.1.1.1` manually overrides the default router ID selection, ensuring a persistent OSPF identifier. `passive-interface g0/0` suppresses OSPF hello packets on that interface, so no neighbors are formed but the connected subnet is still advertised. `neighbor 192.168.1.2` statically defines an OSPF neighbor IP for non-broadcast networks where multicast hellos cannot reach the peer. `show ip ospf neighbor` is an EXEC command that displays the current neighbor adjacency table, including neighbor state and interface. `clear ip ospf process` resets all OSPF processes, forcing router ID re-election and full re-adjacency.
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.
✓
router ospf 1
Why this is correct
This command enables the OSPF routing process with a process ID of 1. It is the first step in configuring OSPF on a router.
This command is used to define which interfaces participate in OSPF and assign them to an area, not to enable the OSPF process.
✗
area 0 stub
Why it's wrong here
This command configures an area as a stub area to reduce the number of LSAs, but it does not enable the OSPF process.
✗
default-information originate
Why it's wrong here
This command injects a default route into OSPF, but it is not used to enable the OSPF process.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓router ospf 1Correct answer▾
Why this is correct
This command enables the OSPF routing process with a process ID of 1. It is the first step in configuring OSPF on a router.
✗network 10.0.0.0 0.255.255.255 area 0Wrong answer — click to see why▾
Why this is wrong here
The network command specifies interfaces and their OSPF area, but it does not start the OSPF process itself.
Why candidates choose this
Candidates might confuse the network command as the first step because it is often the next command after enabling OSPF, and it is critical for OSPF operation.
✗area 0 stubWrong answer — click to see why▾
Why this is wrong here
The area stub command is used to optimize OSPF in certain network designs, not to start the OSPF process.
Why candidates choose this
Candidates might think that configuring an area is the first step because areas are a fundamental concept in OSPF.
✗default-information originateWrong answer — click to see why▾
Why this is wrong here
The default-information originate command is used for redistributing a default route, not for starting OSPF.
Why candidates choose this
Candidates might associate this command with OSPF configuration because it is commonly used, but it is not the initial step.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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.
Trap categories for this question
Command / output trap
This command is used to define which interfaces participate in OSPF and assign them to an area, not to enable the OSPF process.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
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 200-301 OSPF questions on adjacency and route selection.
IP Routing — This question tests IP Routing — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: router ospf 1 — The `network 10.0.0.0 0.255.255.255 area 0` command activates OSPF on any interface with an IP in the 10.0.0.0/8 range (wildcard mask 0.255.255.255) and assigns it to area 0. `router-id 1.1.1.1` manually overrides the default router ID selection, ensuring a persistent OSPF identifier. `passive-interface g0/0` suppresses OSPF hello packets on that interface, so no neighbors are formed but the connected subnet is still advertised. `neighbor 192.168.1.2` statically defines an OSPF neighbor IP for non-broadcast networks where multicast hellos cannot reach the peer. `show ip ospf neighbor` is an EXEC command that displays the current neighbor adjacency table, including neighbor state and interface. `clear ip ospf process` resets all OSPF processes, forcing router ID re-election and full re-adjacency.
What should I do if I get this 200-301 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 200-301 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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