IETF: infrastructure protocols

• Some link layer

  PPP
  

• Network layer

  IPv4, IPv6
  
  Routing protocols

• Transport layer

  TCP, UDP, RTP
  

• Security services

  Transport layer security, IPSEC, ISAKMP
  

• Telephony signaling

  Signaling transport
  

• Quality support

  Differentiated services
  
  Integrated services

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