Chapter 2 outline 口21 Principles of layer protoco/∞ 口26S0 cket programming with tCp o clients and servers 0 2.7 Socket programming o app requirements with UDP 02.2 Web and Http 02.8 Building a Web 口2.3FTP server 口24E| ectronic mail 02.9 Content distribution O SMTP POP3, IMAP o Network Web caching 0 25DNS o Content distribution networks o P2P file sharing 2: Application Layer 32: Application Layer 3 Chapter 2 outline  2.1 Principles of app layer protocols  clients and servers  app requirements  2.2 Web and HTTP  2.3 FTP  2.4 Electronic Mail  SMTP, POP3, IMAP  2.5 DNS  2.6 Socket programming with TCP  2.7 Socket programming with UDP  2.8 Building a Web server  2.9 Content distribution  Network Web caching  Content distribution networks  P2P file sharing