100-150: Cisco Certified Support Technician (CCST) NetworkingDemo

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QuestionQ49

Networking Fundamentals

A host has been assigned the IP address 172.16.100.25 with the subnet mask 255.255.252.0.

What is the CIDR notation for this address?

  • A 172.16.100.25 /21
  • B 172.16.100.25 /22
  • C 172.16.100.25 /23
  • D 172.16.100.25 /20
Explanation

The mask 255.255.252.0 contains 22 contiguous network bits: 16 bits from the first two octets and 6 bits from 252 in the third octet. Its CIDR prefix length is therefore /22.

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