dns notes

Notes on DNS, filed under linux/networking:

src/pages/articles/linux/networking/dns-notes.md

• A records map a name to an IPv4 address
• AAAA records map a name to an IPv6 address
• CNAME records alias one name to another
• MX records point to mail servers

This file demonstrates nesting: the article index groups posts by their folder, so this one shows up under ~/articles/linux/networking/.