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300-410 Practice Question: Consider the following partial configuration on…
Consider the following partial configuration on router R2:
interface GigabitEthernet0/0 ip address 10.0.0.2 255.255.255.0 ip ospf 1 area 0
!
interface GigabitEthernet0/1 ip address 192.168.1.2 255.255.255.0 ip ospf 1 area 0
!
router ospf 1
router-id 2.2.2.2
network 10.0.0.0 0.0.0.255 area 0 network 192.168.1.0 0.0.0.255 area 0
What is the effect of this configuration?
⚠ Common exam trap
Many candidates think interface-level and network-level OSPF commands conflict or cause redundancy errors, when in fact they are both valid and can coexist without issue.
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
✓
OSPF will form adjacencies on both interfaces as intended; the configuration is redundant but functional.
The configuration redundantly enables OSPF on both interfaces via both the `ip ospf 1 area 0` interface-level command and the `network` statements under the OSPF process. This is valid and does not cause conflicts; OSPF will form adjacencies on both interfaces as intended. The router-id 2.2.2.2 is explicitly configured and will not be overridden by any loopback IP unless the router-id is not set or is removed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
OSPF will not form adjacencies because the interface and network commands conflict, causing OSPF to ignore the network statements.
Why it's wrong here
There is no conflict; both methods can be used together. OSPF will use the interface configuration and the network statement will also apply, but no conflict arises.
- ✗
OSPF will form adjacencies on both interfaces, but the router-id 2.2.2.2 will be overridden by the highest loopback IP.
Why it's wrong here
The router-id is explicitly set to 2.2.2.2 and will not be overridden by any interface IP unless the router-id is removed or reset.
- ✓
OSPF will form adjacencies on both interfaces as intended; the configuration is redundant but functional.
Why this is correct
Both interfaces have OSPF enabled via the interface command and the network statement. This is acceptable and OSPF will operate normally.
- ✗
OSPF will only form adjacency on GigabitEthernet0/1 because the network statement for 10.0.0.0 is incorrect.
Why it's wrong here
The network 10.0.0.0 0.0.0.255 area 0 correctly matches the 10.0.0.0/24 subnet on GigabitEthernet0/0.
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.