DNS
Why do we need DNS?
| Human-Friendly Name | Machine-Friendly Name |
|---|---|
| dns.google.com | 8.8.8.8 |
| dns.cloudfare.com | 1.1.1.1 |
Terminology
Labels
| Node | Subdomain | Domain | TLD | Root | |||
|---|---|---|---|---|---|---|---|
| www | . | abc | . | xyz | . | com | . |
where TLD is an abbreviation for "Top Level Domain".
Zones
Query Types
- Recursive
- Iterative