[Solved] Given this security group rule for an RDS instance:Inbound: TCP, Port 5432, Source: 10.0.0.0/24Which IP address can connect to the database? | AWS

AWS - RDS and Relational Databases

Given this security group rule for an RDS instance:
Inbound: TCP, Port 5432, Source: 10.0.0.0/24
Which IP address can connect to the database?

A192.168.1.10

B10.0.0.15

C10.0.1.15

D172.16.0.5

Step-by-Step Solution

Solution:

Step 1: Understand the CIDR range 10.0.0.0/24
This range includes IPs from 10.0.0.0 to 10.0.0.255.
Step 2: Check which IP falls inside this range
10.0.0.15 is inside the range; others are outside.
Final Answer:
10.0.0.15 -> Option B
Quick Check:
CIDR 10.0.0.0/24 includes 10.0.0.15 [OK]

Quick Trick: CIDR /24 means last octet varies 0-255 [OK]

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