Which statement correctly lists the three IPv4 address classes traditionally and their default masks?

Study for the Internet Protocol Version 4 Test. Use flashcards and multiple-choice questions, each with hints and explanations. Master the exam with confidence!

Multiple Choice

Which statement correctly lists the three IPv4 address classes traditionally and their default masks?

Explanation:
In classful IPv4 addressing, the first octet determines the class and sets the default subnet mask, which defines how much of the address is used for the network versus hosts. Class A uses first octet 0–127 and a default mask of 255.0.0.0, meaning the first octet identifies the network and the remaining 24 bits identify hosts. Class B uses first octet 128–191 with a default mask of 255.255.0.0, giving 16 bits for the host portion. Class C uses first octet 192–223 with a default mask of 255.255.255.0, giving 24 bits for hosts. The statement listed aligns with these definitions: Class A range 0.0.0.0–127.255.255.255 with 255.0.0.0; Class B range 128.0.0.0–191.255.255.255 with 255.255.0.0; Class C range 192.0.0.0–223.255.255.255 with 255.255.255.0. It reflects the traditional boundaries and default masks used before CIDR. (Note: some addresses like 0.0.0.0 and 127.x.x.x have special meanings in practice, but they still fall within these classful ranges.) Other options mix the ranges and masks incorrectly, such as applying the wrong default mask to Class C or using a mask inappropriate for the class.

In classful IPv4 addressing, the first octet determines the class and sets the default subnet mask, which defines how much of the address is used for the network versus hosts. Class A uses first octet 0–127 and a default mask of 255.0.0.0, meaning the first octet identifies the network and the remaining 24 bits identify hosts. Class B uses first octet 128–191 with a default mask of 255.255.0.0, giving 16 bits for the host portion. Class C uses first octet 192–223 with a default mask of 255.255.255.0, giving 24 bits for hosts.

The statement listed aligns with these definitions: Class A range 0.0.0.0–127.255.255.255 with 255.0.0.0; Class B range 128.0.0.0–191.255.255.255 with 255.255.0.0; Class C range 192.0.0.0–223.255.255.255 with 255.255.255.0. It reflects the traditional boundaries and default masks used before CIDR. (Note: some addresses like 0.0.0.0 and 127.x.x.x have special meanings in practice, but they still fall within these classful ranges.)

Other options mix the ranges and masks incorrectly, such as applying the wrong default mask to Class C or using a mask inappropriate for the class.

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