Background - Protocol Values

• many values are used in network protocols

  both numbers & strings
  

• to identify nodes

  e.g., IP Addresses & domain names
  

• to differentiate applications

  e.g., IP ports (telnet vs. web)
  

• to define options within an application

  e.g., TELNET line vs. character mode
  

• data types

  e.g., MIME email media types
  

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