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

easy📝 Conceptual Q1 of 15
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:
  1. 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.
  2. 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.
  3. Final Answer:

    A network with 65,536 IP addresses -> Option B
  4. Quick Check:

    CIDR /16 = 65,536 IPs [OK]
Quick Trick: Subtract mask from 32, then 2 to that power [OK]
Common Mistakes:
MISTAKES
  • Confusing mask bits with number of IPs
  • Forgetting total bits are 32
  • Mixing up network and host bits

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