ANS-C01 Network Design Practice Question
A company has a VPC with a CIDR of 10.0.0.0/16. They need to create a subnet for a new application that requires at least 2000 usable IP addresses. Which subnet size should they choose?
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
✓
/20 (4096 IPs)
A /20 subnet provides 4096 total IP addresses, with 4091 usable (AWS reserves 5). This meets the requirement of at least 2000 usable IP addresses. Option A (/24) provides 251 usable. Option B (/22) provides 1023 usable. Option C (/19) provides 8191 usable, which is more than needed, but /20 is the smallest sufficient subnet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
/24 (256 IPs)
Why it's wrong here
Only 251 usable, insufficient.
- ✗
/22 (1024 IPs)
Why it's wrong here
1023 usable, insufficient.
- ✗
/19 (8192 IPs)
Why it's wrong here
Larger than necessary but could work; however, /20 is the most efficient.
- ✓
/20 (4096 IPs)
Why this is correct
4091 usable, sufficient.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services 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 ANS-C01 exam.