Модульні уроки (2/4)
Lo spazio dei nomi
The namespace
DNS names are made of labels separated by dots. The root is the empty label at the far right, usually shown as a final dot. A fully qualified domain name (FQDN) states its complete position in this tree.
Worked example
Read api.shop.example.test. from right to left: root, test, example, shop, then api. Each step moves to a more specific name. shop.example.test. is a domain; api.shop.example.test. can name a host or another DNS node.
The dots are structural separators. A label has a length limit, and the full wire-format name has a separate limit. Do not confuse a domain name with the URL scheme, path, or port used by an application.
Use training names under .test; they are reserved for examples and should not be treated as public production domains.
Check your understanding
Choose the best answer. This quiz runs locally and sends no DNS queries to real domains.
In `api.shop.example.test.`, which label is closest to the root?