Network edge: connectionless service

Goal: data transfer between end systems

• same as before!

• UDP - User Datagram Protocol [RFC 768]: Internet’s connectionless service

  • unreliable data transfer
  • no flow control
  • no congestion control

App’s using TCP:

• HTTP (WWW), FTP (file transfer), Telnet (remote login), SMTP (email)

App’s using UDP:

• streaming media, teleconferencing, Internet telephony

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