What is the subnet mask for a Class C network with default subnetting ?

In IPv4 addressing, networks are divided into classes (A, B, C, D, E) based on the first octet. A Class C network uses the first three bits of the address to identify it, leaving 24 bits for host addressing. With default subnetting, no additional bits are borrowed from the host portion to create subnets.\nTherefore, the first three octets (24 bits) are reserved for the network ID, and the last octet is used for host IDs. This results in a subnet mask of 255.255.255.0, where each '255' represents 8 bits of network address (11111111 in binary) and '0' represents the host portion.\nOption A (255.0.0.0) is the default mask for Class A networks, and Option B (255.255.0.0) is for Class B networks. Option D (255.255.255.255) represents a single host address (/32), not a standard network mask.