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Abstract Today computer networks have a tremendous effect on our socIety and economy than any other networks whIch have been developed 1 n the pastLocal area networks ( LAN) are specIal case of computer networks lImIted In geographIc scope. It provIdes hIgh bandwIdth overInexpensivetransmIssIon medIa.The need for multiaccess protocols arIses whenever a resource Is shared among a number Of I ndependent users.In thIs thesIs we suggest a mOdIfIcation of the CarrlerSense MUltlple ACcess Protocol (CSMA/CD )[23). The goal of the mOdified protocol Is to decrease number Of collIsIons suffered by a packet during Its trIal for transmIssIon Achlevlng this objective means better packet delay and better throughput characterlstlcs. AnalytIcal and slmulatlon models were used to stUdy the performance Of the proposed protOCOl In comparison with other protocols. The theSIS IS diVided Into four chapters. Chapter I contaans a brief survey of computer networks and how protocola are Il1plemented In layers. The speCial case of local area networks IS also presented. In chapter 11 multlaccess protocols are surveyed In detal1 wIth concentratIon on the ,-•andom acc.;ess protocols along Wl th a diSCUSSIon of theIr performance. In chapter III the proposed protocol 18 Introduced, analysls Of the protOCOl and the sta1;e dlagra. are shoWn. In Chapter IV the resul ts for the proposed protocol are analysed and compared wl th Wl th o.ther ra~ access protOCOl s. |