Connections

• A socket is an {IP address, port} pair

• A connection is defined by a pair of sockets, I.e, the 4-tuple:{{IP source address, source port},{IP destination address, destination port}}

• Note that many different connections can share the same socket on one end

  • I.e., the analogy to a hardware outlet isn’t exact
  • This permits “well known ports” for servers

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