Computer Networks: A Systems Approach

850 Pages·2021·27.73 MB·English

by  Larry L. Peterson, Bruce S. Davie

InPraiseofComputerNetworks:ASystems
Approach
PetersonandDaviehavewrittenanoutstandingbookforthecomputernetwork-
ing world. It is a well-organized book that features a very helpful “big picture”
systemsapproach.Thisbookisamusthave!
YonshikChoi
IllinoisInstituteofTechnology
WhatyouholdinyourhandsisthemostcomprehensivetextbookonComputer
Networks available. Whether you are introducing undergraduates to Networks
for the first time or expanding the knowledge of graduate students, the mate-
rialthosestudentsneedtoknowliesinthesepages.Thetextbuildsoneconcept
on another, starting with encoding of bits and proceeding logically to the global
Internetandtheapplicationsthatrunonit.Itrustedthe5th editionforyearsand
am excited to entrust my students and the networked future they create to this
new6thedition.
Christopher(Kit)Cischke
MichiganTechnologicalUniversity
IhaveusedComputerNetworks:ASystemsApproachforoverfiveyearsinan
introductory course on communications networks aimed at upper-level under-
graduates and first-year Masters students. I have gone through several editions
and over the years the book has kept what from the beginning had been its
main strength, namely, that it not only describes the ‘how,’ but also the ‘why’
andequallyimportant,the‘whynot’ofthings.Itisabookthatbuildsengineering
intuition,andinthisdayandageoffast-pacedtechnologychanges,thisiscritical
to develop a student’s ability to make informed decisions on how to design or
selectthenextgenerationsystems.
RochGuerin
UniversityofPennsylvania
Thisbookisanoutstandingintroductiontocomputernetworksthatisclear,com-
prehensive,andchock-fullofexamples.PetersonandDaviehaveagiftforboiling
networking down to simple and manageable concepts without compromising
technical rigor. ComputerNetworks:ASystemsApproach strikes an excellent
balance between the principles underlying network architecture design and the
applications built on top. It should prove invaluable to students and teachers of
advancedundergraduateandgraduatenetworkingcourses.
ArvindKrishnamurthy
UniversityofWashington
Computer Networks: A Systems Approach has always been one of the best
resourcesavailabletogainanin-depthunderstandingofcomputernetworks.The
latest edition covers recent developments in the field. Starting with an overview
in Chapter 1, the authors systematically explain the basic building blocks of
networks. Both hardware and software concepts are presented. The material
is capped with a final chapter on applications, which brings all the concepts
together. Optional advanced topics are placed in a separate chapter. The text-
bookalsocontainsasetofexercisesofvaryingdifficultyattheendofeachchapter
whichensurethatthestudentshavemasteredthematerialpresented.
KarkalPrabhu
DrexelUniversity
PetersonandDavieprovideadetailedyetcleardescriptionoftheInternetproto-
colsatalllayers.Studentswillfindmanystudyaidsthatwillhelpthemgainafull
understanding of the technology thatis transforming our society.The bookgets
betterwitheachedition.
JeanWalrand
UniversityofCaliforniaatBerkeley
ThroughmyyearsofteachingComputerNetworksandliterallyreadingeverytext-
book on the subject I could find to discover the best, none fit that description
better than this one, in my opinion. While the layered approach can be useful
for beginners learning the very basics of networks (and this book can be used
as such), the systems approach is how my classroom moves from learning to
doing. Students’ evaluations frequently reveal that they truly love this book, and
sodoI.Isimplywanttousethebest,whichiswhyI’veusedthisbookforalmost
adecade.
G.AaronWilkin
Rose-HulmanInstituteofTechnology
Sixth Edition
Computer Networks
a systems approach
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Sixth Edition
Computer Networks
a systems approach
Larry L. Peterson and Bruce S. Davie
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Foreword
Readers: before you start the book, first take a moment and set your
timemachineto1996.Thatiswhenthefirsteditionofthisbookwas
published. Do you remember 1996? Were you alive then? People forget
howlongagothefoundationsoftheInternetwerelaid.
In1996,theNSFNEThadjustbeendecommissioned,andthecommer-
cialphaseoftheInternetwasjustbeginning.Thefirstsearchengine(Alta
Vista—do you remember?) had just been demonstrated. Content deliv-
erynetworksdidnotexist—Akamaiwasfoundedtwoyearslaterin1998,
thesameyearGooglewasofficiallyborn.Cloudwasonlyadistanthaze
onthehorizon.Andtherewasnosuchthingasresidentialbroadbandor
consumerwireless.Weuseddial-upmodems—the56Kmodemhadjust
beeninvented.Therewerepacketradiosbeforethen,buttheywereslower
thandial-upandthesizeofabeerfridge.Youneededatruckoratleasta
Jeeptobemobile.
Andin1995orso,LarryandBrucedecidedtowritethisbook.Itmaybe
hard,fromtoday’sperspective,torememberhowimportantabooklike
thiswasin1996.Itcapturedalotoftacitknowledgeandmadeitavailable
toanyonewhowouldread.Andratherthanjustrecitingaseriesofpro-
tocoldescriptions,ittaughthowthepartsfittogether.Ittaughthowthe
Internetworked,notjustwhatthepartswere.
One way to think about how the Internet has evolved is through the
lensoftheapplicationdesigner.Afterall,thepurposeoftheInternetasa
packettransportsystemistosupportapps.Onlygeeksandperformance
freaks send packets for the fun of it. In 1996, if you wanted to build an
application,theecosystemincludedtheIPpackettransportservice,TCP
tosmoothoutthelossesattheInternetlayer,theDNS,andthatwasabout
it. Anything else the application designer needed had to be built from
scratch.
Now an application designer has lots of resources to build on: cloud
andcloudnetworks,otherglobalnetworksthatcanhookservicestogether,
CDNs, app development environments, and so on. Some of these may
seem quite different from what we had in 1996 and in detail they are.
Consider cloud. (I hate the choice of the term—to me “cloud” suggests
somethingsoftandfluffy,butifyouhaveeverseenadatacenterthesizeof
ix