CIDR
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What is CIDR?
CIDR, or Classless Inter-Domain Routing, is a method of allocating IP addresses and routing that replaced the older class-based system. Instead of fixed classes (A, B, C), CIDR uses a slash notation (e.g., 192.168.1.0/24) to indicate how many bits are used for the network portion of the address. This allows for more flexible and efficient use of IP address space and is the standard method used in modern networking.
Free resources to learn CIDR
More in stage 10: Subnetting
CIDR: common questions
Can I learn CIDR in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain CIDR in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this CIDR tutorial for beginners?
It is lesson 90 of 195 in the free Network Engineer roadmap, in stage 10, Subnetting. If you are new to Network Engineer, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.