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by Yoshifumi Nishida #11 01/14/2003

What is TCP? (2)

• TCP provides reliable data transfer service.
  
  
  • Why is reliable data transfer necessary?
    
    
    • Some applications need to send data to receivers as it is.
      
      
      • E-mail, File transfer..
        
        
• UDP provides unreliable data transfer service.
  
  
  • Why is unreliable data transfer necessary?
    
    
    • Some applications need to send data as quick as possible.
      
      
      • Video transfer..