Subnet (Subnetwork)
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A logical subdivision of an IP network created by dividing the IP address into network and host portions using a subnet mask. For example, 192.168.1.0/24 defines a subnet with 254 usable host addresses. Subnetting improves network performance, security, and management by isolating broadcast domains. CIDR (Classless Inter-Domain Routing) notation like /24 or /16 specifies the subnet mask length.