[Solved] You need to design a VPC with exactly 3 subnets: one public with 100 IPs, one private with 50 IPs, and one isolated with... Which CIDR block allocation fits best inside 10.0.0.0/24 without overlap? | AWS

AWS - VPC Fundamentals

You need to design a VPC with exactly 3 subnets: one public with 100 IPs, one private with 50 IPs, and one isolated with 25 IPs. Which CIDR block allocation fits best inside 10.0.0.0/24 without overlap?

A10.0.0.0/24, 10.0.1.0/25, 10.0.2.0/26

B10.0.0.0/26, 10.0.0.64/26, 10.0.0.128/26

C10.0.0.0/25, 10.0.0.128/26, 10.0.0.192/27

D10.0.0.0/26, 10.0.0.64/27, 10.0.0.96/28

Step-by-Step Solution

Solution:

Step 1: Calculate needed CIDR for each subnet
100 IPs need at least /25 (128 IPs), 50 IPs need /26 (64 IPs), 25 IPs need /27 (32 IPs).
Step 2: Assign CIDRs inside 10.0.0.0/24 without overlap
10.0.0.0/25 covers 0-127, 10.0.0.128/26 covers 128-191, 10.0.0.192/27 covers 192-223. These fit perfectly without overlap.
Final Answer:
10.0.0.0/25, 10.0.0.128/26, 10.0.0.192/27 -> Option C
Quick Check:
Subnet sizes fit and sum within /24 [OK]

Quick Trick: Match subnet size to nearest CIDR block, assign sequentially [OK]

Common Mistakes:

Using CIDRs too small for IP needs
Overlapping subnet ranges
Assigning subnets outside VPC CIDR

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More AWS Quizzes

Which CIDR block allocation fits best inside 10.0.0.0/24 without overlap?

Step 1: Calculate needed CIDR for each subnet

Step 2: Assign CIDRs inside 10.0.0.0/24 without overlap

Final Answer:

Quick Check:

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