- A
EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range.
Correct. The first network statement uses a wildcard mask to specify the exact subnet, while the second is classful.
- B
Both network statements are classful and will enable EIGRP on all interfaces with IP addresses in the 192.168.0.0/16 and 10.0.0.0/8 ranges.
Why wrong: Incorrect. The first network statement includes a wildcard mask, making it not classful.
- C
EIGRP will only be enabled on interfaces with an IP address in the 192.168.1.0/24 range.
Why wrong: Incorrect. The second network statement will also enable EIGRP on interfaces in the 10.0.0.0/8 range.
- D
This configuration will cause an error because wildcard masks are not allowed in EIGRP network statements.
Why wrong: Incorrect. Wildcard masks are allowed in EIGRP network statements in classic mode.
Quick Answer
The correct choice is that EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range. This is because the EIGRP network statement with wildcard mask 0.0.0.255 explicitly limits the 192.168.1.0 network to the /24 subnet, while the second statement omits a wildcard mask, causing the router to apply the classful boundary for the Class A 10.0.0.0 network, thus enabling EIGRP on all interfaces within the entire 10.0.0.0/8 range. On the ENCOR 350-401 exam, this concept tests your understanding of how EIGRP interprets network statements—specifically, the difference between classful and classless advertisement. A common trap is assuming that omitting a wildcard mask defaults to a /24, but in reality, it defaults to the classful prefix. Remember the tip: “No mask means classful; a mask means precise.”
350-401 EIGRP Practice Question
This 350-401 practice question tests your understanding of eigrp. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Given the following EIGRP configuration on a router:
router eigrp 200 network 192.168.1.0 0.0.0.255 network 10.0.0.0
Which statement about this configuration is true?
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
EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range.
Option A is correct because the first network statement uses a wildcard mask (0.0.0.255) to enable EIGRP only on interfaces in the 192.168.1.0/24 subnet, while the second network statement (10.0.0.0) is classful and enables EIGRP on all interfaces in the 10.0.0.0/8 range. EIGRP network statements can include a wildcard mask to specify a subnet; without one, the router assumes the classful boundary.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range.
Why this is correct
Correct. The first network statement uses a wildcard mask to specify the exact subnet, while the second is classful.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Both network statements are classful and will enable EIGRP on all interfaces with IP addresses in the 192.168.0.0/16 and 10.0.0.0/8 ranges.
Why it's wrong here
Incorrect. The first network statement includes a wildcard mask, making it not classful.
- ✗
EIGRP will only be enabled on interfaces with an IP address in the 192.168.1.0/24 range.
Why it's wrong here
Incorrect. The second network statement will also enable EIGRP on interfaces in the 10.0.0.0/8 range.
- ✗
This configuration will cause an error because wildcard masks are not allowed in EIGRP network statements.
Why it's wrong here
Incorrect. Wildcard masks are allowed in EIGRP network statements in classic mode.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between classful and classless network statements in EIGRP, where candidates mistakenly assume that a network statement without a wildcard mask applies only to the exact subnet rather than the entire classful range.
Detailed technical explanation
How to think about this question
EIGRP network statements use a wildcard mask (inverse of subnet mask) to match interfaces; if omitted, the router defaults to the classful mask (e.g., /8 for Class A, /16 for Class B). This allows precise control over which interfaces participate in EIGRP, which is critical in networks with discontiguous subnets or when you want to avoid advertising on certain links. Under the hood, the router checks the interface IP against the network statement using a bitwise AND with the wildcard mask.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 350-401 question test?
EIGRP — This question tests EIGRP — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: EIGRP will be enabled on any interface with an IP address in the 10.0.0.0/8 range, and only on interfaces with an IP address in the 192.168.1.0/24 range. — Option A is correct because the first network statement uses a wildcard mask (0.0.0.255) to enable EIGRP only on interfaces in the 192.168.1.0/24 subnet, while the second network statement (10.0.0.0) is classful and enables EIGRP on all interfaces in the 10.0.0.0/8 range. EIGRP network statements can include a wildcard mask to specify a subnet; without one, the router assumes the classful boundary.
What should I do if I get this 350-401 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
This 350-401 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 350-401 exam.
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