mediumMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot OSPF…
A network engineer runs the following command to troubleshoot OSPF route filtering:
R1# show ip ospf database router 2.2.2.2
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
LS age: 300 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 2.2.2.2 Advertising Router: 2.2.2.2 LS Seq Number: 80000004 Checksum: 0x1234 Length: 48 Number of Links: 2
Link connected to: a Stub Network (Link ID) Network/subnet number: 10.1.1.0 (Link Data) Network Mask: 255.255.255.0 Number of TOS metrics: 0 TOS 0 Metrics: 10
Link connected to: a Transit Network (Link ID) Designated Router address: 10.1.1.2 (Link Data) Router Interface address: 10.1.1.1 Number of TOS metrics: 0 TOS 0 Metrics: 10
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
✓
Router 2.2.2.2 is advertising two links, one of which is a stub network 10.1.1.0/24.
The output shows the OSPF router LSA from router 2.2.2.2. It lists two links: one stub network (10.1.1.0/24) and one transit network (via DR 10.1.1.2). This is normal OSPF operation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Router 2.2.2.2 is advertising two links, one of which is a stub network 10.1.1.0/24.
Why this is correct
The Router Link States entry for 2.2.2.2 lists Number of Links: 2, with the first link described as a Stub Network whose Link ID is 10.1.1.0 and mask 255.255.255.0, giving 10.1.1.0/24. This matches the option exactly.
- ✗
Router 2.2.2.2 is filtering routes from area 0.
Why it's wrong here
The command displays router 2.2.2.2's Router Link State Advertisements, listing its stub and transit links; it reveals nothing about route filtering, which is applied via distribute-lists or prefix-lists on the routing process. It is tempting because the router LSA is examined during OSPF troubleshooting, but filtering would be verified with show ip ospf database and route tables.
- ✗
Router 2.2.2.2 is a DR for the transit network.
Why it's wrong here
The transit link's Link ID is the DR address 10.1.1.2, and the Link Data is 10.1.1.1, the advertising router's own interface address, so 2.2.2.2 is a neighbour on that segment, not the DR. It is tempting because the DR address appears prominently in the Link ID field, but that field names the segment's DR, not the router being examined.
- ✗
Router 2.2.2.2 has a mismatched area ID.
Why it's wrong here
The header shows Advertising Router 2.2.2.2 within Router Link States (Area 0), confirming 2.2.2.2 sits in area 0 with no mismatch. It is tempting because area mismatches do stop OSPF adjacencies and appear in database output, but the correct scenario for that symptom is a neighbour stuck in EXSTART or DOWN, not this LSA.
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
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.