- A
The route 192.168.10.0/24 is learned from an EIGRP neighbor.
Why wrong: The next hop is 0.0.0.0, which means the route is locally originated, not learned from a neighbor.
- B
The route is a summary route configured on this router.
Why wrong: While summary routes also show as originating, the output does not show any summary flag. The route is likely redistributed.
- C
The route is redistributed into EIGRP from another protocol, such as OSPF or BGP.
The route is in Passive state, originating, with next hop 0.0.0.0, indicating it is locally injected into EIGRP, typically via redistribution.
- D
The route is a connected interface that is advertised in EIGRP.
Why wrong: Connected interfaces also show as originating, but they would have a different metric and vector metric values. The metric 128256 is typical for redistributed routes.
Quick Answer
The answer is that the route is redistributed into EIGRP from another protocol, such as OSPF or BGP. This is indicated by the "Originating" state and the next-hop address of 0.0.0.0 (Null0) in the topology table, which signifies that the local router is the originator of this route—either as a summary or a redistributed entry. The metric of 128256 with a hop count of 0 further confirms it is not learned from an EIGRP neighbor but injected locally. On the Cisco CCNP ENARSI 300-410 exam, this output tests your ability to distinguish between internal, external, and redistributed routes in the EIGRP topology table, a common trap being to assume all Passive routes are internal. A key memory tip: if you see "Originating" and Null0, think "Originator equals Redistribution or Summary"—the router is advertising it as its own.
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.
A network engineer runs the following command to troubleshoot a Route Redistribution issue:
R1# show ip eigrp topology 192.168.10.0/24
And sees the following output:
IP-EIGRP (AS 100): Topology entry for 192.168.10.0/24 State: Passive, Originating, 1 successors, FD is 128256 Routing Descriptor Blocks:
0.0.0.0 (Null0), from 0.0.0.0, Send flag 0x0
Composite metric is (128256/0), Route is Internal Vector metric: Minimum bandwidth is 100000 Kbit Total delay is 5000 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 0
What does this output indicate?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 route is redistributed into EIGRP from another protocol, such as OSPF or BGP.
The show ip eigrp topology command shows a route that is in Passive state and marked as Originating, with the next hop as 0.0.0.0 (Null0). This indicates that the route is a summary route or a redistributed route that is being originated by this router. The metric 128256 and hop count 0 suggest it is a directly connected or redistributed route.
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 route 192.168.10.0/24 is learned from an EIGRP neighbor.
Why it's wrong here
The next hop is 0.0.0.0, which means the route is locally originated, not learned from a neighbor.
- ✗
The route is a summary route configured on this router.
Why it's wrong here
While summary routes also show as originating, the output does not show any summary flag. The route is likely redistributed.
- ✓
The route is redistributed into EIGRP from another protocol, such as OSPF or BGP.
Why this is correct
The route is in Passive state, originating, with next hop 0.0.0.0, indicating it is locally injected into EIGRP, typically via redistribution.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The route is a connected interface that is advertised in EIGRP.
Why it's wrong here
Connected interfaces also show as originating, but they would have a different metric and vector metric values. The metric 128256 is typical for redistributed routes.
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
While summary routes also show as originating, the output does not show any summary flag. The route is likely redistributed.
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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Route Redistribution — study guide chapter
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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: The route is redistributed into EIGRP from another protocol, such as OSPF or BGP. — The show ip eigrp topology command shows a route that is in Passive state and marked as Originating, with the next hop as 0.0.0.0 (Null0). This indicates that the route is a summary route or a redistributed route that is being originated by this router. The metric 128256 and hop count 0 suggest it is a directly connected or redistributed route.
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: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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