mediumMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot OSPF…
A network engineer runs the following command to troubleshoot OSPF route propagation:
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: 45 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: 80000005 Checksum: 0x1234 Length: 48 Number of Links: 2
Link connected to: a Transit Network (Link ID) Designated Router address: 10.1.1.2 (Link Data) Router Interface address: 10.1.1.2 Number of TOS metrics: 0 TOS 0 Metrics: 10
Link connected to: a Stub Network (Link ID) Network/subnet number: 192.168.1.0 (Link Data) Network Mask: 255.255.255.0 Number of TOS metrics: 0 TOS 0 Metrics: 10
What does this output indicate?
⚠ Common exam trap
300-410 often tests the ability to interpret OSPF database output. Candidates may confuse Router LSA with Network LSA or misread the link types. The trap is assuming that any link with a network address is a stub network, ignoring the transit network designation.
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 has a link to a transit network with DR address 10.1.1.2 and a stub network 192.168.1.0/24.
The output shows a Router LSA (Type 1) for Router ID 2.2.2.2. It lists two links: one connected to a Transit Network with Designated Router address 10.1.1.2, and one connected to a Stub Network with network 192.168.1.0/24. This matches option B. The LSA is not a Type 5 External LSA (which would be shown differently) nor a Network LSA (Type 2). The router is advertising its links, not two stub networks (only one stub network is listed).
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 stub networks.
Why it's wrong here
The output shows one transit link and one stub link, so claiming two stub networks misreads the Link Type field. It tempts because stub links do appear in Router LSAs, and a router with multiple stub segments would legitimately produce such entries — but here only a single stub network (192.168.1.0/24) is listed.
- ✓
Router 2.2.2.2 has a link to a transit network with DR address 10.1.1.2 and a stub network 192.168.1.0/24.
Why this is correct
The Router Link States entry for 2.2.2.2 lists two links: one to a transit network whose Designated Router address is 10.1.1.2, and one stub network with subnet 192.168.1.0 and mask 255.255.255.0, confirming both link types.
- ✗
The LSA indicates a Type 5 External LSA from ASBR.
Why it's wrong here
This is a Type 1 Router LSA, identified by LS Type: Router Links, not a Type 5 External LSA generated by an ASBR. It tempts because ASBRs also originate Router LSAs, but external routes require a separate Type 5 advertisement carrying the external prefix and forwarding address.
- ✗
The output shows the network LSA for the transit network.
Why it's wrong here
Type 2 network LSAs are generated by the DR and list attached routers; this entry is a Type 1 router LSA, identified by 'LS Type: Router Links' and the advertising router's own ID. Network LSAs appear under 'show ip ospf database network' with the DR's interface address as Link State ID.
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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.