Transcription of Chapter 2 Circuit and Packet Switching - Stanford …
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Chapter 2 Circuit and Packet Switching - Stanford …
Chapter2 Circuitand Packet IntroductionIt is widelyassumedthat, for reasonsof e ciency, the various communicationnet-works (Internet,telephone,TV,radio, ..) will mergeinto one ubiquitous, Packet -switched network that carriesall forms of communications. Thisview of the futureis particularlyprevalent among the Internetcommunity, whereit is assumedthatpacket-switched IP is the layer over which everythingelse will be thischapter, I present evidenceso as to arguethat this will not happen. Thisstance iscontroversial,and is di cultto make concrete,as any attemptto compare the variouscandidates for the transport infrastructure1is fraught withlack of data and the dif- culty of making apples-with-applescomparisons. Therefore,the evidencepresentedhereis di erent fromother chaptersin thisthesis. Observations,casestudies, andanecdotal data(ratherthan controlled experiments, simulationsand proofs) are usedto take a stanceand to predicthow the network architecture will the initial goals of the Internet,two maincharacteristicsseemto accountfor its success:reachabilityandheterogeneity.
22 CHAPTER 2. CIRCUIT AND PACKET SWITCHING In spite of all the strengths of IP, this chapter will argue how it will be very hard for IP to displace existing networks.
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