- A
The OSPF route to 10.1.1.0/30 has been lost, making the next-hop address 10.1.1.2 unresolvable.
A recursive static route requires a next-hop that is resolvable via an existing route. Without the OSPF route to the subnet containing 10.1.1.2, the router cannot reach the next hop and removes the static route from the routing table.
- B
The static route has a higher administrative distance than OSPF, so OSPF's route to 192.168.10.0/24 replaced it.
Why wrong: If OSPF had a route to 192.168.10.0/24, the static route would remain in the routing table but would not be used (inactive). The prompt states the route has completely disappeared, indicating next-hop reachability failure, not route preference.
- C
The static route uses a next-hop IP address that is not directly connected, which is unsupported on this platform.
Why wrong: Cisco routers fully support recursive static routes that point to a next-hop IP reachable via another route (including OSPF). The configuration is valid as long as the next hop is resolvable.
- D
A routing loop caused by recursive lookups has suppressed the static route to prevent loops.
Why wrong: Recursive route installation does not suppress routes unless there is a circular dependency that prevents resolution. In this scenario, the route disappears because the OSPF route is lost, not because of a loop-detection mechanism.
CCNA IP Routing Practice Question
This 200-301 practice question tests your understanding of ip routing. 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.
A network engineer configures a static route: ip route 192.168.10.0 255.255.255.0 10.1.1.2. The next hop 10.1.1.2 is reachable via OSPF. Later, the engineer notices that the route to 192.168.10.0/24 has disappeared from the routing table. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 OSPF route to 10.1.1.0/30 has been lost, making the next-hop address 10.1.1.2 unresolvable.
A recursive static route uses a next-hop IP address; the router must have a route that resolves that next hop. If the OSPF route to the 10.1.1.0/30 network is lost, the next-hop 10.1.1.2 becomes unreachable, and the static route is withdrawn from the routing table. None of the other explanations account for the route disappearance given the scenario.
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.
- ✓
The OSPF route to 10.1.1.0/30 has been lost, making the next-hop address 10.1.1.2 unresolvable.
Why this is correct
A recursive static route requires a next-hop that is resolvable via an existing route. Without the OSPF route to the subnet containing 10.1.1.2, the router cannot reach the next hop and removes the static route from the routing table.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The static route has a higher administrative distance than OSPF, so OSPF's route to 192.168.10.0/24 replaced it.
Why it's wrong here
If OSPF had a route to 192.168.10.0/24, the static route would remain in the routing table but would not be used (inactive). The prompt states the route has completely disappeared, indicating next-hop reachability failure, not route preference.
- ✗
The static route uses a next-hop IP address that is not directly connected, which is unsupported on this platform.
Why it's wrong here
Cisco routers fully support recursive static routes that point to a next-hop IP reachable via another route (including OSPF). The configuration is valid as long as the next hop is resolvable.
- ✗
A routing loop caused by recursive lookups has suppressed the static route to prevent loops.
Why it's wrong here
Recursive route installation does not suppress routes unless there is a circular dependency that prevents resolution. In this scenario, the route disappears because the OSPF route is lost, not because of a loop-detection mechanism.
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.
✓The OSPF route to 10.1.1.0/30 has been lost, making the next-hop address 10.1.1.2 unresolvable.Correct answer▾
Why this is correct
A recursive static route requires a next-hop that is resolvable via an existing route. Without the OSPF route to the subnet containing 10.1.1.2, the router cannot reach the next hop and removes the static route from the routing table.
✗The static route has a higher administrative distance than OSPF, so OSPF's route to 192.168.10.0/24 replaced it.Wrong answer — click to see why▾
Why this is wrong here
Believing that a static route is removed from the routing table when a better route exists, rather than understanding it remains but is inactive.
✗The static route uses a next-hop IP address that is not directly connected, which is unsupported on this platform.Wrong answer — click to see why▾
Why this is wrong here
Assuming that a static route's next-hop must be directly attached, ignoring that recursive routing via another routing protocol or static route is allowed.
✗A routing loop caused by recursive lookups has suppressed the static route to prevent loops.Wrong answer — click to see why▾
Why this is wrong here
Thinking that recursive static routes are prone to loop suppression, rather than understanding that the route is simply withdrawn when the next-hop is no longer reachable.
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
Scenario analysis trap
Recursive route installation does not suppress routes unless there is a circular dependency that prevents resolution. In this scenario, the route disappears because the OSPF route is lost, not because of a loop-detection mechanism.
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.
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 200-301 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 200-301 question test?
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: The OSPF route to 10.1.1.0/30 has been lost, making the next-hop address 10.1.1.2 unresolvable. — A recursive static route uses a next-hop IP address; the router must have a route that resolves that next hop. If the OSPF route to the 10.1.1.0/30 network is lost, the next-hop 10.1.1.2 becomes unreachable, and the static route is withdrawn from the routing table. None of the other explanations account for the route disappearance given the scenario.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 14, 2026
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