What does CIDR notation /yy indicate in IPv4 subnetting?

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Multiple Choice

What does CIDR notation /yy indicate in IPv4 subnetting?

Explanation:
CIDR notation /yy shows how many bits in the IPv4 address are used for the network portion. IPv4 addresses are 32 bits, so the first yy bits are the network prefix and the remaining 32 minus yy bits are the host portion. This means /yy directly tells you the length of the network prefix in bits. For example, /24 uses the first 24 bits for the network, leaving 8 bits for hosts, which corresponds to a subnet mask of 255.255.255.0 and up to 254 usable hosts in that subnet. The slash value isn’t the total number of hosts itself (that’s derived from 2^(32−yy) minus 2), and it isn’t the default classful mask—CIDR lets you specify any prefix length.

CIDR notation /yy shows how many bits in the IPv4 address are used for the network portion. IPv4 addresses are 32 bits, so the first yy bits are the network prefix and the remaining 32 minus yy bits are the host portion. This means /yy directly tells you the length of the network prefix in bits. For example, /24 uses the first 24 bits for the network, leaving 8 bits for hosts, which corresponds to a subnet mask of 255.255.255.0 and up to 254 usable hosts in that subnet. The slash value isn’t the total number of hosts itself (that’s derived from 2^(32−yy) minus 2), and it isn’t the default classful mask—CIDR lets you specify any prefix length.

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