← Computer Networks learning pathComputer Networks · Module 6 of 10
Application layer protocols
Know the protocols applications use.
📖 Key ideas
- HTTP/HTTPS for the web.
- DNS translates domain names to IPs.
- SMTP sends email; IMAP/POP3 receive it.
- FTP/SFTP transfer files; SSH for remote login.
- DHCP assigns IP settings automatically.
💡 Real-life example: DNS is the phonebook of the internet: look up a name to get the number.
DNSDomain Name System
SMTPSimple Mail Transfer Protocol
DHCPDynamic Host Configuration Protocol
SSHSecure Shell