Chapter 2: outline 2. 1 principles of 2.6 P2P applications network 2.7 socket applications programming with 2.2 Web and Http UDP and TCP 2.3 FTP 2 4 electronic mail SMTP POP 3 IMAP 25 DNS Application Layer 2-2Application Layer 2-2 Chapter 2: outline 2.1 principles of network applications 2.2 Web and HTTP 2.3 FTP 2.4 electronic mail ❖ SMTP, POP3, IMAP 2.5 DNS 2.6 P2P applications 2.7 socket programming with UDP and TCP