What is the term for the address notation that uses an IP address followed by a slash and a prefix length to describe the subnet?

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Multiple Choice

What is the term for the address notation that uses an IP address followed by a slash and a prefix length to describe the subnet?

Explanation:
CIDR notation uses an IP address followed by a slash and a prefix length to describe the subnet. The number after the slash shows how many leading bits are fixed to identify the network, which determines the size of the subnet and how many host addresses it contains. For example, 192.168.0.0/24 fixes the first 24 bits as the network, leaving 8 bits for hosts, which yields 256 addresses (254 usable). This notation lets networks be sized flexibly and enables efficient routing by summarizing multiple subnets. The other concepts don’t fit this notation: a subnet mask is written separately as dotted-decimal values like 255.255.255.0 and is used in conjunction with an IP address to compute the network address, not as slash-based prefix length; IPX is a distinct protocol; and a VLAN ID is a layer 2 tag used to separate broadcast domains, not a way to describe IP subnets.

CIDR notation uses an IP address followed by a slash and a prefix length to describe the subnet. The number after the slash shows how many leading bits are fixed to identify the network, which determines the size of the subnet and how many host addresses it contains. For example, 192.168.0.0/24 fixes the first 24 bits as the network, leaving 8 bits for hosts, which yields 256 addresses (254 usable). This notation lets networks be sized flexibly and enables efficient routing by summarizing multiple subnets.

The other concepts don’t fit this notation: a subnet mask is written separately as dotted-decimal values like 255.255.255.0 and is used in conjunction with an IP address to compute the network address, not as slash-based prefix length; IPX is a distinct protocol; and a VLAN ID is a layer 2 tag used to separate broadcast domains, not a way to describe IP subnets.

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