66_________________________________________ Internet

 ,    .    -
        
.

     TCP   
 "" . ,   ,   -
        -
  Internet.

  ,  
 

 TCP       -
,  IP        -
 .  TCP-  "  -
"   ,  
   ,   IP.

 , TCP    , -
      -
 TCP.

   TCP       
       -
,        
  ,    ,  -
 .

   IP-, TCP    
       URG.   -
  " "   ,   
        -
,      .  
, . .   URG- TCP- -
, ,    .

    

-   IP-.  TCP, -
  IP-,   TCP- (. 2.13).

Source Port (16 ).  .
Destination Port (16 ).  .

Sequence Number (32 ).  .     -
    (  ,    SYN).
     SYN,     
   (ISN)     -
   ISN+1.