mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show ip ospf database external 10.1.1.0
OSPF Router with ID (1.1.1.1) (Process ID 1)
Type-5 AS External Link States (Area 0)
LS age: 120 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 10.1.1.0 (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
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 redistributed into OSPF from another protocol with a route-map setting the tag to 100.
The output shows an OSPF Type-5 external LSA for 10.1.1.0/24 with Metric Type 2 and Metric 20. The default metric for redistributed routes in OSPF is 20 for Type 2. The External Route Tag of 100 indicates a redistribution tag, often used for filtering or route-maps.
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 redistributed into OSPF from another protocol with a route-map setting the tag to 100.
Why this is correct
The External Route Tag of 100 is a common indicator that a route-map was used during redistribution to set the tag.
- ✗
The route 10.1.1.0/24 is an OSPF inter-area route from area 0.
Why it's wrong here
This is a Type-5 LSA, which is external, not inter-area (Type-3).
- ✗
The metric of 20 indicates the route is redistributed with a default metric of 20, which is correct for Type 1 external routes.
Why it's wrong here
Metric Type 2 is default; Type 1 would have metric-type 1. The metric 20 is default for Type 2.
- ✗
The forward address of 0.0.0.0 indicates that the next hop is the advertising router 2.2.2.2.
Why it's wrong here
Forward address 0.0.0.0 means the next hop is the advertising router itself, but this is a standard behavior, not a problem.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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