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Given this security group ingress rule: Protocol: TCP, Port Range: 22, Source: 203.0.113.0/24, which of the following IP addresses is allowed to connect via SSH?

medium📝 Predict Output Q13 of 15
AWS - Security Groups and Network ACLs
Given this security group ingress rule: Protocol: TCP, Port Range: 22, Source: 203.0.113.0/24, which of the following IP addresses is allowed to connect via SSH?
A203.0.114.10
B203.0.113.45
C192.168.1.1
D0.0.0.0
Step-by-Step Solution
Solution:

  1. Step 1: Understand the CIDR range 203.0.113.0/24

    This range includes all IPs from 203.0.113.0 to 203.0.113.255.

  2. Step 2: Check which IP falls inside this range

    203.0.113.45 is inside the range; others are outside.

  3. Final Answer:

    203.0.113.45 -> Option B

  4. Quick Check:

    IP in 203.0.113.0/24 allowed [OK]
Quick Trick: Check if IP fits CIDR range to allow access [OK]
Common Mistakes:
MISTAKES
  • Assuming 203.0.114.x is inside 203.0.113.0/24
  • Confusing 0.0.0.0 with a valid IP
  • Not understanding CIDR notation

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