Hi all,   
      
   I'm trying to get a better picture of TCP,   
      
   I think I understand TCP fast retransmit / recovery, and the selective ACK   
   option.   
      
   What I'm wondering is, if you have  TCP fast retransmit / recovery, why would   
   you need selective ACK ?   
   It appears it does the same thing at the end ?   
      
   I know selective ACK is negotiated at the start of the TCP session.   
   Is TCP fast retransmit/recovery a standard and use in all TCP sessions ?   
   Can both coexist together ? if yes, how ?   
      
   thanks for that   
   francois   
      
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