6.5.1 - Host Names and Domain Names

Flashcards reviewing key concepts related to host names and domain names, including FQDN structure and restrictions.

What is a key requirement for a host name?

Must be unique within the domain.

What is the maximum length of an FQDN?

253 characters.

What is the maximum length of each label in an FQDN?

63 characters.

What characters should a DNS label use?

Letters, digits, and hyphens.

What is a restriction of a DNS label?

It should not start with a hyphen.

What punctuation characters should not be used in a DNS label?

The period (.) or forward slash (/).

Are DNS labels case-sensitive?

They are not case-sensitive.

What is a host name?

A "friendly" name assigned to each host, easier for people to remember than the IP address.

What is the purpose of an FQDN?

To provide a unique identity for the host belonging to a particular network.

What is an FQDN made up of?

Host name and a domain suffix.

What does the trailing dot in an FQDN represent?

Represents the root of the hierarchy.

Why must a domain name be registered with a registrar?

To ensure that it is unique within a top-level domain.