JMU
Classless Interdomain Routing (CIDR)
An Introduction


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu


History
History (cont.)
CIDR Basics
Number of CIDR Addresses
Combining Networks
Combining Networks (cont.)
Partitioning Networks

Example: Creating Two /24 Networks from a /23

192.168.64.0/23      11000000. 10101000.01000000.00000000

192.168.64.0/24      11000000. 10101000.01000000.00000000
192.168.65.0/24      11000000. 10101000.01000001.00000000
  
The Hierarchical Relationship

Part of the Hierarchy

images/cidr_partial-tree.gif