mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Given the following configuration snippet on…
Given the following configuration snippet on Router R5:
router eigrp 400 network 10.1.1.0 0.0.0.255
What is wrong with this configuration?
⚠ Common exam trap
Cisco often tests the distinction between wildcard masks and subnet masks, leading candidates to incorrectly assume that a subnet mask (like 255.255.255.0) should be used in the EIGRP network command instead of the correct wildcard mask.
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 configuration is correct as shown.
The configuration uses a valid EIGRP AS number (400) and a correct wildcard mask (0.0.0.255) to match the 10.1.1.0/24 subnet. In EIGRP, the network command uses a wildcard mask to specify the exact interfaces to advertise, and 0.0.0.255 is the proper inverse of the subnet mask 255.255.255.0.
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 wildcard mask should be 255.255.255.0.
Why it's wrong here
EIGRP uses wildcard masks, not subnet masks.
- ✗
The network address should be the classful network 10.0.0.0.
Why it's wrong here
EIGRP allows subnet-specific network statements.
- ✓
The configuration is correct as shown.
Why this is correct
The network command with a wildcard mask is valid for EIGRP.
- ✗
The AS number 400 is invalid; EIGRP AS numbers must be between 1 and 65535.
Why it's wrong here
EIGRP AS numbers can be from 1 to 65535; 400 is valid.
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 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.