What does the CIDR notation 10.0.0.0/16 specify in AWS VPC networking?

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AWS - VPC Fundamentals

What does the CIDR notation 10.0.0.0/16 specify in AWS VPC networking?

AA network with 256 IP addresses

BA network with 65,536 IP addresses

CA network with 512 IP addresses

DA network with 1024 IP addresses

Step-by-Step Solution

Solution:

Step 1: Understand CIDR notation
The number after the slash indicates how many bits are fixed for the network. Here, /16 means 16 bits fixed.
Step 2: Calculate number of IP addresses
IPv4 addresses have 32 bits total. So, 32 - 16 = 16 bits for hosts. Number of IPs = 2^16 = 65,536.
Final Answer:
A network with 65,536 IP addresses -> Option B
Quick Check:
CIDR /16 = 65,536 IPs [OK]

Quick Trick: Subtract mask from 32, then 2 to that power [OK]

Common Mistakes:

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