AWS - VPC Fundamentals
Which of the following is the correct CIDR notation for a subnet with 512 IP addresses?
Which of the following is the correct CIDR notation for a subnet with 512 IP addresses?
easy📝 Configuration Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate bits needed for 512 addresses
512 addresses require 9 bits (2^9 = 512) for host part.Step 2: Determine CIDR prefix
IPv4 has 32 bits total, so prefix = 32 - 9 = 23. So CIDR is /23.Final Answer:
/23 -> Option AQuick Check:
512 IPs = 2^(32-23) = 512 [OK]
Quick Trick: Use 32 minus log2(IP count) for CIDR [OK]
Common Mistakes:
MISTAKES- Choosing /24 which gives only 256 addresses
- Confusing /22 with 1024 addresses
- Miscounting bits for hosts
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