Describe the rules for domain names and host names, including length of an FQDN, and how upper - and lowercase are handled.

What will be an ideal response?


First, the total length of a FQDN cannot exceed 255 characters, including the "." separator characters. Beyond that, the names are limited to uppercase and lowercase letters (A-Z, a-z), numbers (0-9), and the hyphen. Further, do not count on uppercase and lowercase alone for making names unique, because, while DNS allows you to use both upper - and lowercase, it does not differentiate between them.

Computer Science & Information Technology

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