- A
The OSPF routes have a higher metric than the EIGRP routes.
Why wrong: Metric does not affect redistribution; only the presence of the route in the routing table matters.
- B
The OSPF routes are not in the routing table because they are overridden by a static route with AD 1.
If a static route with AD 1 exists for the same prefix, the OSPF route will not be installed, and redistribution will not include it.
- C
The redistribute ospf 1 metric 10000 command is missing.
Why wrong: A missing metric can cause redistribution to fail, but the question states some routes are redistributed, so the command is present.
- D
The OSPF routes are external type 2, which are not redistributed by default.
Why wrong: OSPF external routes are redistributed by default; there is no restriction based on type.
Quick Answer
The answer is that the OSPF routes are not being redistributed into EIGRP because they have been overridden by a static route with a lower administrative distance of 1. This occurs because redistribution into EIGRP only pulls routes that are present in the global routing table; if an OSPF-learned route is not installed due to a static route override, it simply does not exist for redistribution, regardless of the OSPF database. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of how redistribution interacts with route selection—specifically that the routing table, not the protocol database, is the source for redistribution. A common trap is assuming all OSPF routes are automatically eligible, but the key is that a static route with AD 1 preempts the OSPF route (AD 110), and the redistributed OSPF routes showing AD 170 are a red herring. Memory tip: "If it's not in the table, it's not on the cable"—redistribution only sees what the router uses.
300-410 Administrative Distance Practice Question
This 300-410 practice question tests your understanding of administrative distance. 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.
An engineer is troubleshooting a route redistribution issue between OSPF and EIGRP. R1 runs both protocols and redistributes OSPF into EIGRP. The engineer notices that OSPF routes redistributed into EIGRP have an AD of 170, but some routes from OSPF are not being redistributed. 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 routes are not in the routing table because they are overridden by a static route with AD 1.
Redistribution into EIGRP requires matching routes; by default, only routes in the routing table are redistributed. If OSPF routes are not in the routing table because they are overridden by another protocol with lower AD, they will not be redistributed.
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 routes have a higher metric than the EIGRP routes.
Why it's wrong here
Metric does not affect redistribution; only the presence of the route in the routing table matters.
- ✓
The OSPF routes are not in the routing table because they are overridden by a static route with AD 1.
Why this is correct
If a static route with AD 1 exists for the same prefix, the OSPF route will not be installed, and redistribution will not include it.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The redistribute ospf 1 metric 10000 command is missing.
Why it's wrong here
A missing metric can cause redistribution to fail, but the question states some routes are redistributed, so the command is present.
- ✗
The OSPF routes are external type 2, which are not redistributed by default.
Why it's wrong here
OSPF external routes are redistributed by default; there is no restriction based on type.
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
A missing metric can cause redistribution to fail, but the question states some routes are redistributed, so the command is present.
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 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?
Administrative Distance — This question tests Administrative Distance — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The OSPF routes are not in the routing table because they are overridden by a static route with AD 1. — Redistribution into EIGRP requires matching routes; by default, only routes in the routing table are redistributed. If OSPF routes are not in the routing table because they are overridden by another protocol with lower AD, they will not be redistributed.
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.
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 18, 2026
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