hardMultiple SelectObjective-mapped
300-410 Practice Question: Which THREE statements about route redistribution…
Which THREE statements about route redistribution and administrative distance are true? (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
✓
EIGRP external routes (redistributed) have a default administrative distance of 170.
Administrative distance (AD) is crucial in redistribution because it determines which routes are preferred when multiple protocols learn the same prefix. Option A is correct: EIGRP has a default AD of 90 for internal routes and 170 for external (redistributed) routes. Option B is correct: OSPF external routes have a default AD of 110, same as internal OSPF routes, but can be changed. Option C is correct: Changing AD can influence route selection and help prevent routing loops. Option D is incorrect: The distance command can be applied to both internal and external routes. Option E is incorrect: RIP has a default AD of 120, which is higher than OSPF's 110, so OSPF is preferred.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
EIGRP external routes (redistributed) have a default administrative distance of 170.
Why this is correct
Correct: EIGRP uses AD 170 for external routes, while internal routes use 90.
- ✓
OSPF external routes (type 1 and type 2) have a default administrative distance of 110.
Why this is correct
Correct: OSPF uses AD 110 for both internal and external routes by default.
- ✓
Adjusting administrative distance can be used to influence route selection and prevent routing loops during redistribution.
Why this is correct
Correct: Changing AD can make one protocol's routes preferred over another, helping to avoid loops.
- ✗
The 'distance' command in OSPF can only be applied to external routes, not internal routes.
Why it's wrong here
Incorrect: The distance command in OSPF can be applied to both internal and external routes.
- ✗
When redistributing RIP into OSPF, the redistributed routes will have a lower administrative distance than OSPF internal routes.
Why it's wrong here
Incorrect: OSPF internal routes have AD 110, and redistributed routes also have AD 110 (or can be changed). RIP has AD 120, so redistributed routes from RIP into OSPF will have OSPF's AD.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
Key term
Route Redistribution Between Protocols
Route redistribution between protocols is the process of taking routes learned from one routing protocol and injecting them into another routing protocol so that networks using different protocols can communicate.
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Same concept, more angles
2 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. What is the default administrative distance for routes redistributed into EIGRP from another protocol?
medium- A.90
- B.110
- ✓ C.170
- D.200
Why C: By default, EIGRP assigns an administrative distance of 170 to routes learned via redistribution, distinguishing them from internal EIGRP routes (AD 90) and external EIGRP routes (AD 170).
Variation 2. What is the default administrative distance for routes redistributed into BGP from an IGP?
medium- A.20
- B.110
- C.170
- ✓ D.200
Why D: When routes are redistributed into BGP from an IGP, they become local BGP routes, not eBGP. The default administrative distance for local BGP routes is 200, as configured by the `distance bgp` command: `distance bgp 20 200 200` (external, internal, local). Therefore, redistributed routes, which are considered local, have an AD of 200.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.