DNS Query: (name, type)

Resource record: (name, value, type, TTL)

Types:

• A (domain, ipv4 address)
• AAAA (domain, ipv6 address)
• NS (domain, nameserver)
• CNAME (hostname, canonical name)
• MX (domain, canonical name of mailserver and priority)

DNS §

• getaddrinfo
• getnameinfo

Socket API §

Client:

1. socket
2. connect
3. send, recv
4. close

Server:

1. socket (creates fd)
2. bind
3. listen
4. accept upon receiving connections (creates another fd)
5. send, recv
6. close