Internet of Things (IoT) Practice Exam

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Which of the following IPv4 addresses is in correct format?

172.16.400.3
172.a4.400.3
172.16.286.3
None of the above

The correct answer is: None of the above

The question requires identifying an IPv4 address that adheres to the proper format, which consists of four octets. Each octet must contain a decimal number within the range of 0 to 255. The first option, 172.16.400.3, includes an octet (400) that exceeds the maximum limit of 255, rendering it invalid. The second option, 172.a4.400.3, contains a non-numeric character ('a'), which again is not acceptable in an IP address. The third option, 172.16.286.3, has an octet (286) that also exceeds the 255 cap. Given that all provided IPv4 addresses are invalid due to various formatting errors, the conclusion is that none of these options represent a correctly formatted IPv4 address. Therefore, selecting "None of the above" is indeed the accurate assessment of the situation. This process emphasizes the importance of adhering to the defined range for each octet in an IPv4 address.