ITGSS Certified Technology Specialist

Which of the following does not represent a valid DNS record class?

1. IN

2. CH

3. CS

4. HS

The correct answer is: CS

The correct choice indicates a lack of recognition as a standard DNS record class. The Internet (IN) class is the most commonly used class in DNS records, and it signifies that the data is related to the Internet. The CH class stands for Chaos, which is a lesser-known and rarely used class typically associated with DNS experiments. The HS class refers to Hesiod, which is also an experimental DNS class designed for use in specific environments or for particular applications, such as when integrating identity information. In contrast, CS is not recognized as a valid DNS record class within the standard list of DNS classes. The three main classes that are commonly encountered are IN, CH, and HS, making CS an invalid entry in this context. Understanding the validity of these classes is crucial for anyone involved in DNS management and configuration, as each class serves a specific purpose or application in the domain name resolution process.