68__________________________________________ Internet

Urgent Pointer (16 ).    .   
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  URG.

Options.   :    .
        .

Padding. :  .  () TCP--
      32- .



 TCP-  IP-   
 (. 2.14).    IP-  (Source
Address), IP-  (Destination Address),   (PTCL)
  TCP- (TCP Length).    "" -
  TCP-. ,   
  TCP  IP-     -
  IP-.

	8 16		31
Source Address
	Destination Address
zero	PTCL	TCP	Length	

. 2.14.  
    TCP    RFC-793, RFC-1180.

 UDP

UDP (User Datagram Protocol,   ) -
      , -
      .    
 UDP-  IP.

 UDP     -
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  .     
 ,        
.        -
   , UDP      IP-
.  UDP-   . 2.15.