What is the size of an IPv4 address and how is it represented?

An IPv4 address is 32 bits long, represented as four decimal octets separated by dots (dotted-decimal notation), e.g., 192.168.1.1.

What is the default subnet mask for a Class A network?

The default subnet mask for a Class A network is 255.0.0.0 (/8), leaving 24 bits for host addressing.

What is the valid range of first octets for Class B IPv4 addresses?

Class B addresses have a first octet range of 128–191, with a default subnet mask of 255.255.0.0 (/16).

What is the valid range of first octets for Class C IPv4 addresses?

Class C addresses have a first octet range of 192–223, with a default subnet mask of 255.255.255.0 (/24).

What are the three private IPv4 address ranges defined in RFC 1918?

The three private ranges are 10.0.0.0/8, 172.16.0.0/12 (172.16.0.0–172.31.255.255), and 192.168.0.0/16.

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