mediumMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Route Redistribution issue:
R1# show ip ospf database external
And sees the following output:
OSPF Router with ID (1.1.1.1) (Process ID 1)
Type-5 AS External Link States
LS age: 360 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 192.168.10.0 (External Network Number ) Advertising Router: 2.2.2.2 LS Seq Number: 80000001 Checksum: 0x1234 Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 0.0.0.0 External Route Tag: 100
What does this output indicate?
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 OSPF with a metric of 20 and a route tag of 100.
The output shows a Type-5 AS External LSA for 192.168.10.0/24, which means the route was redistributed into OSPF. The LSA has Metric: 20 and External Route Tag: 100, so the route is redistributed into OSPF with a metric of 20 and a route tag of 100. The forward address 0.0.0.0 indicates that the advertising ASBR is the next hop, not that the route is unreachable, and the Link State ID and network mask identify a specific /24 route, not the default route.
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 an OSPF internal route.
Why it's wrong here
The route is an external route, not internal, as indicated by the Type 5 LSA. Internal OSPF routes are Type 1 or Type 2 LSAs.
- ✓
The route is redistributed into OSPF with a metric of 20 and a route tag of 100.
Why this is correct
The route is redistributed but it is a default route, not a specific network route. The metric and tag are correct, but the route type is default.
- ✗
The forward address is 0.0.0.0, meaning the route is not reachable.
Why it's wrong here
A forward address of 0.0.0.0 does not mean the route is unreachable; it means the advertising router is the next hop. The route is reachable via the advertising router.
- ✗
The route is a default route redistributed into OSPF.
Why it's wrong here
Correct. The Type 5 LSA with forward address 0.0.0.0 and metric type 2 is characteristic of a default route redistributed into OSPF, as default routes often have a forward address of 0.0.0.0 and a route tag for identification.
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
BGP Route Selection and Policy
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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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.