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300-410 Practice Question: Which TWO statements about the default…
Which TWO statements about the default administrative distances for different route sources are correct? (Choose TWO.)
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 default administrative distance for a connected interface is 0.
Cisco IOS assigns default AD values to various route sources. Connected interfaces have an AD of 0, static routes have 1, EIGRP summary routes have 5, internal BGP has 200, and external EIGRP has 170. OSPF has 110, and RIP has 120. Knowing these defaults is critical for troubleshooting route selection.
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 default administrative distance for a connected interface is 0.
Why this is correct
Correct. Connected routes have the highest trustworthiness with an AD of 0.
- ✗
The default administrative distance for internal BGP (iBGP) is 20.
Why it's wrong here
Incorrect. The default AD for iBGP is 200. 20 is the default AD for external BGP (eBGP).
- ✓
The default administrative distance for external EIGRP routes is 170.
Why this is correct
Correct. External EIGRP routes (redistributed) have a default AD of 170, which is higher than internal EIGRP (90).
- ✗
The default administrative distance for RIP is 100.
Why it's wrong here
Incorrect. The default AD for RIP is 120, not 100.
- ✗
The default administrative distance for OSPF is 90.
Why it's wrong here
Incorrect. The default AD for OSPF is 110, not 90. 90 is for EIGRP internal routes.
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.
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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.