- A
The route 10.1.1.0/24 is an EIGRP internal route.
Why wrong: The administrative distance of 170 indicates an external route, not internal. Internal EIGRP routes have a default distance of 90.
- B
The route 10.1.1.0/24 is an EIGRP external route, likely redistributed.
The administrative distance of 170 is the default for EIGRP external routes, confirming redistribution.
- C
The route 10.1.1.0/24 is learned via OSPF and redistributed into EIGRP.
Why wrong: The output shows the route is known via EIGRP, not OSPF. The distance is EIGRP external, but the source protocol is not indicated.
- D
The administrative distance of 170 is non-default and must have been manually configured.
Why wrong: 170 is the default administrative distance for EIGRP external routes, not a manual configuration.
Quick Answer
The correct answer is that the route 10.1.1.0/24 is an EIGRP external route, likely redistributed. This is confirmed by the administrative distance of 170 in the show ip route output, which is the default AD for EIGRP external routes, as opposed to the default AD of 90 for internal EIGRP routes. The metric of 30720 further supports this, as it matches the default seed metric for a redistributed connected interface. On the Cisco CCNP ENARSI 300-410 exam, this distinction tests your understanding of route redistribution and administrative distance behavior, often appearing in troubleshooting scenarios where a redistributed route is preferred or ignored over another protocol. A common trap is confusing the AD of 170 with a less trustworthy route, when in fact it simply marks the route as external. For a quick memory tip, remember: “90 is internal, 170 is external—redistributed routes get the higher number.”
300-410 Administrative Distance Practice Question
This 300-410 practice question tests your understanding of administrative distance. 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 30720 Redistributing via eigrp 100 Last update from 192.168.1.2 on GigabitEthernet0/0, 00:00:05 ago Routing Descriptor Blocks:
* 192.168.1.2, from 192.168.1.2, 00:00:05 ago, via GigabitEthernet0/0
Route metric is 30720, traffic share count is 1
Based on this output, which statement is correct?
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 10.1.1.0/24 is an EIGRP external route, likely redistributed.
The output shows an EIGRP route with an administrative distance of 170, which is the default distance for EIGRP external routes. This indicates the route was redistributed into EIGRP from another protocol or process. The metric of 30720 is the default for a redistributed connected 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 10.1.1.0/24 is an EIGRP internal route.
Why it's wrong here
The administrative distance of 170 indicates an external route, not internal. Internal EIGRP routes have a default distance of 90.
- ✓
The route 10.1.1.0/24 is an EIGRP external route, likely redistributed.
Why this is correct
The administrative distance of 170 is the default for EIGRP external routes, confirming redistribution.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
The route 10.1.1.0/24 is learned via OSPF and redistributed into EIGRP.
- ✗
The administrative distance of 170 is non-default and must have been manually configured.
Why it's wrong here
170 is the default administrative distance for EIGRP external routes, not a manual configuration.
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
The output shows the route is known via EIGRP, not OSPF. The distance is EIGRP external, but the source protocol is not indicated.
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 route 10.1.1.0/24 is an EIGRP external route, likely redistributed. — The output shows an EIGRP route with an administrative distance of 170, which is the default distance for EIGRP external routes. This indicates the route was redistributed into EIGRP from another protocol or process. The metric of 30720 is the default for a redistributed connected 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.
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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