CIDR notation, which stands for Classless Inter-Domain Routing notation, is a shorthand method used to represent IP address ranges and network prefixes. CIDR notation is used to express the number of bits in a network mask, which determines the size of a network and the number of available IP addresses.

CIDR notation consists of an IP address followed by a slash (/) and a number between 0 and 32, which represents the number of bits in the network mask. For example, the CIDR notation for a network with the IP address 192.168.1.0 and a subnet mask of 255.255.255.0 is 192.168.1.0/24, where the number 24 represents the number of bits in the subnet mask.

CIDR notation allows for more flexible and efficient allocation of IP addresses compared to the traditional class-based IP address scheme, which had predefined address blocks for different classes of networks. CIDR notation allows for smaller network prefixes, which can conserve IP addresses and provide more efficient use of network resources.

Understanding CIDR notation is important for network administrators and engineers as it is commonly used in network planning and design, IP address allocation, and routing table configuration. It enables them to effectively manage and allocate IP addresses and configure network routing protocols to ensure efficient and effective network communication.

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