- A
Routing loops occur where packets traverse multiple routers repeatedly.
Correct: This is a classic symptom of mutual redistribution without proper filtering.
- B
Traffic from one area takes a longer path than expected, even though a shorter path exists within the same routing domain.
Correct: This indicates that a redistributed route is preferred over an internal route, often due to administrative distance issues.
- C
CPU utilization on the redistribution router is consistently below 50%.
Why wrong: Incorrect: Low CPU is not a symptom of redistribution problems.
- D
Some networks are not reachable from certain parts of the network, even though they are present in the routing table of the redistribution router.
Correct: This can happen if redistribution is not configured on all required routers or if filters block routes.
- E
The routing table on all routers is stable and converges quickly after a topology change.
Why wrong: Incorrect: Stable convergence is a sign of a healthy network, not a problem.
Quick Answer
The answer is routing loops, suboptimal routing, and missing routes. These three symptoms directly indicate a problem with route redistribution because they arise when redistributed routes are improperly re-injected into the source protocol, creating a loop; when a router prefers a redistributed route over a more direct path, causing suboptimal routing; or when redistribution filters or missing configuration cause some networks to be unreachable from certain parts of the network, even though they are present in the routing table of the redistribution router. On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish redistribution-specific symptoms from general network issues—a common trap is confusing high CPU or a stable routing table with redistribution problems, but those are not direct indicators. A helpful memory tip is to think of the three S’s: Suboptimal, Stuck (loops), and Silent (missing routes).
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. 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.
Which THREE symptoms indicate a problem with route redistribution causing suboptimal routing or routing loops? (Choose THREE.)
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
Routing loops occur where packets traverse multiple routers repeatedly.
Route redistribution issues often manifest as routing loops, suboptimal paths, or missing routes. A routing loop (option A) occurs when redistributed routes are re-injected back into the source protocol. Suboptimal routing (option B) happens when a router prefers a redistributed route over a more direct one. Missing routes (option D) can occur if redistribution is not configured or if filters block routes. Option C is incorrect because high CPU may indicate many things, not specifically redistribution. Option E is incorrect because a stable routing table does not indicate a problem.
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.
- ✓
Routing loops occur where packets traverse multiple routers repeatedly.
Why this is correct
Correct: This is a classic symptom of mutual redistribution without proper filtering.
Related concept
OSPF neighbours must agree on key parameters.
- ✓
Traffic from one area takes a longer path than expected, even though a shorter path exists within the same routing domain.
Why this is correct
Correct: This indicates that a redistributed route is preferred over an internal route, often due to administrative distance issues.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
CPU utilization on the redistribution router is consistently below 50%.
Why it's wrong here
Incorrect: Low CPU is not a symptom of redistribution problems.
- ✓
Some networks are not reachable from certain parts of the network, even though they are present in the routing table of the redistribution router.
Why this is correct
Correct: This can happen if redistribution is not configured on all required routers or if filters block routes.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The routing table on all routers is stable and converges quickly after a topology change.
Why it's wrong here
Incorrect: Stable convergence is a sign of a healthy network, not a problem.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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 300-410 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Route Redistribution — This question tests Route Redistribution — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Routing loops occur where packets traverse multiple routers repeatedly. — Route redistribution issues often manifest as routing loops, suboptimal paths, or missing routes. A routing loop (option A) occurs when redistributed routes are re-injected back into the source protocol. Suboptimal routing (option B) happens when a router prefers a redistributed route over a more direct one. Missing routes (option D) can occur if redistribution is not configured or if filters block routes. Option C is incorrect because high CPU may indicate many things, not specifically redistribution. Option E is incorrect because a stable routing table does not indicate a problem.
What should I do if I get this 300-410 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 300-410 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 18, 2026
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