Question 2,057 of 2,152

Route Redistribution →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the redistributed EIGRP route is causing a potential routing loop because the router shows the route as both learned and self-originated via redistribution. This is correct because the administrative distance of 170 indicates an external EIGRP route, meaning it was injected from another routing protocol, while the “self originated” message confirms that Router R1 itself is redistributing this same route back into EIGRP. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to spot redistribution loops by interpreting the `show ip route` output, specifically the distance and redistribution flags. A common trap is assuming all EIGRP routes have a distance of 90, but external routes use 170, and the “self originated” tag is the critical red flag. To remember, think: “170 means external, self-originated means circular”—if a router both learns and redistributes the same prefix, you have a loop waiting to happen.

300-410 Route Redistribution Practice Question

This 300-410 practice question tests your understanding of route redistribution. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 on Router R1:

R1# show ip route 10.1.1.0

Routing entry for 10.1.1.0/24 Known via "eigrp 100", distance 170, metric 2560000 Redistributing via eigrp 100 Advertised by eigrp 100 (self originated) Last update from 10.2.2.2 on GigabitEthernet0/1, 00:00:10 ago Routing Descriptor Blocks:

* 10.2.2.2, from 10.2.2.2, 00:00:10 ago, via GigabitEthernet0/1

Route metric is 2560000, traffic share count is 1 Total delay is 100 microseconds, minimum bandwidth is 100000 Kbit Reliability 255/255, minimum MTU 1500 Loading 1/255, Hops 1

Based on this output, what is the problem?

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.

Question 1mediummultiple choice

Study the full EIGRP explanation →

A
The route 10.1.1.0/24 is an internal EIGRP route because the administrative distance is 90.
Why wrong: The distance is 170, which is for external EIGRP routes.
B
The route is redistributed into EIGRP from another protocol, as indicated by the distance of 170 and the 'self originated' message.
The distance of 170 and the 'self originated' flag indicate redistribution into EIGRP.
C
The route is learned from a neighbor with a metric of 2560000, which is the default for redistributed routes.
Why wrong: The metric is 2560000, but it is not necessarily the default; it is the metric set during redistribution.
D
The route is not being advertised to any EIGRP neighbors because it is marked as 'self originated'.
Why wrong: The 'self originated' flag means the router originated the route, but it can still be advertised to neighbors.

Full breakdown with real-world context →

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, as indicated by the distance of 170 and the 'self originated' message.

The output shows a route learned via EIGRP with an administrative distance of 170, which is the default for external EIGRP routes. The route is marked as 'Redistributing via eigrp 100' and 'Advertised by eigrp 100 (self originated)', indicating that this route was redistributed into EIGRP from another protocol. The problem is that the route is both learned and redistributed by the same router, which could cause a routing loop if not filtered.

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 10.1.1.0/24 is an internal EIGRP route because the administrative distance is 90.
Why it's wrong here
The distance is 170, which is for external EIGRP routes.
✓
The route is redistributed into EIGRP from another protocol, as indicated by the distance of 170 and the 'self originated' message.
Why this is correct
The distance of 170 and the 'self originated' flag indicate redistribution into EIGRP.
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 learned from a neighbor with a metric of 2560000, which is the default for redistributed routes.
Why it's wrong here
The metric is 2560000, but it is not necessarily the default; it is the metric set during redistribution.
✗
The route is not being advertised to any EIGRP neighbors because it is marked as 'self originated'.
Why it's wrong here
The 'self originated' flag means the router originated the route, but it can still be advertised to neighbors.

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 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?

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, as indicated by the distance of 170 and the 'self originated' message. — The output shows a route learned via EIGRP with an administrative distance of 170, which is the default for external EIGRP routes. The route is marked as 'Redistributing via eigrp 100' and 'Advertised by eigrp 100 (self originated)', indicating that this route was redistributed into EIGRP from another protocol. The problem is that the route is both learned and redistributed by the same router, which could cause a routing loop if not filtered.

What should I do if I get this 300-410 question wrong?

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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