Technical Support Fundamental Practice Test

The address 100.0.0.256 is identified as not a valid IP address due to its structure. In the context of IP addressing, specifically IPv4, each segment of an IPv4 address must be a number between 0 and 255. This is because the format consists of four octets, with each octet being an 8-bit number. Therefore, the last octet in this case, which is 256, exceeds the maximum allowed value of 255, making the entire address invalid.

IPv4 addresses are written in the format of four decimal numbers separated by dots, and they must adhere to the range restrictions for each of the segments. As a result, any address that contains a segment greater than 255, like 256 in this case, does not conform to the Internet Protocol addressing rules, and therefore cannot be considered a valid IP address.