Which of the following is a valid Class A address?

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 of the following is a valid Class A address?

Explanation:
In IPv4, classful addressing uses the value of the first octet to determine the class. Class A covers addresses from 1.0.0.0 to 126.255.255.255, with a default mask of 255.0.0.0. The address 10.0.0.1 has a first octet of 10, which falls within that range, so it is a Class A address. The other options belong to different classes or ranges: 192.168.1.1 is Class C (and private), 224.0.0.1 is Class D (multicast), and 128.0.0.1 is Class B. Therefore, 10.0.0.1 is the valid Class A address.

In IPv4, classful addressing uses the value of the first octet to determine the class. Class A covers addresses from 1.0.0.0 to 126.255.255.255, with a default mask of 255.0.0.0. The address 10.0.0.1 has a first octet of 10, which falls within that range, so it is a Class A address. The other options belong to different classes or ranges: 192.168.1.1 is Class C (and private), 224.0.0.1 is Class D (multicast), and 128.0.0.1 is Class B. Therefore, 10.0.0.1 is the valid Class A address.

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