An introduction to network security , basic definitions and aa brief discussion of the architecture of TCP/IP as well as the Open System Intercornnection(OSI) Reference Model open the paper. The relationship between TCP/IP and of some OSI layers is described. An indepth look is provided to the major protocols in TCP/IP suite and the security features and problems in this suite of protocols. The secutiy problems are discussed in the context ofthe protocol services.
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