hardMultiple 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
OSPF Router with ID (10.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.1.1.1 10.1.1.1 120 0x80000002 0x00A1B2 3 10.1.1.2 10.1.1.2 200 0x80000001 0x00B2C3 2 10.1.1.3 10.1.1.3 150 0x80000003 0x00C3D4 4
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
192.168.12.2 10.1.1.2 180 0x80000001 0x00D4E5
Based on this output, what can be concluded?
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 10.1.1.2 is the DR on the segment 192.168.12.0/24.
The database shows router link states for three routers and one net link state. The net link state is advertised by 10.1.1.2, indicating it is the DR on the segment 192.168.12.0/24. The absence of other net link states suggests only one broadcast segment exists.
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 R1 is the DR on the segment 192.168.12.0/24.
Why it's wrong here
The net link state is advertised by 10.1.1.2, not by R1 (10.1.1.1).
- ✓
Router 10.1.1.2 is the DR on the segment 192.168.12.0/24.
Why this is correct
The net link state with Link ID 192.168.12.2 is advertised by 10.1.1.2, meaning it is the DR on that segment.
- ✗
Router 10.1.1.3 has the highest router ID.
Why it's wrong here
Router IDs are 10.1.1.1, 10.1.1.2, and 10.1.1.3; 10.1.1.3 is the highest numerically, but this is not directly relevant to the database output.
- ✗
There is a network LSA for every broadcast segment in area 0.
Why it's wrong here
Only one net link state is present, so either there is only one broadcast segment or other segments have no DR elected.
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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Same concept, more angles
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Variation 1. A network engineer runs the following command on Router R1: R1# show ip ospf database router 10.1.1.2 OSPF Router with ID (10.1.1.1) (Process ID 1) Router Link States (Area 0) LS age: 150 Options: (No TOS-capability, DC) LS Type: Router Links Link State ID: 10.1.1.2 Advertising Router: 10.1.1.2 LS Seq Number: 80000002 Checksum: 0x1234 Length: 48 Number of Links: 2 Link connected to: a Transit Network (Link ID) Designated Router address: 192.168.12.2 (Link Data) Router Interface address: 192.168.12.2 Number of TOS metrics: 0 TOS 0 Metrics: 10 Link connected to: a Stub Network (Link ID) Network/subnet number: 10.2.2.0 (Link Data) Network Mask: 255.255.255.0 Number of TOS metrics: 0 TOS 0 Metrics: 10 Based on this output, which statement is correct?
hard- ✓ A.Router 10.1.1.2 is connected to a transit network and a stub network.
- ✓ B.Router 10.1.1.2 is the DR on the transit network.
- C.Router 10.1.1.2 has a cost of 20 to reach the stub network.
- D.Router 10.1.1.2 is not advertising any external routes.
Why A: The router LSA from 10.1.1.2 shows two links: one to a transit network (with Link ID as the DR address and Link Data as the router's interface address) and one to a stub network (10.2.2.0/24). Therefore, statement A is correct. Additionally, because the Link ID (DR address) equals the Link Data (router's interface address) for the transit link, it indicates that router 10.1.1.2 is the DR on that network. Thus, statement B is also correct.
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.