CCIE professional development routing TCP IP volume i 2nd edition 2005 kho tài liệu training

CCIE Professional Development Routing TCP/IP, Volume I, Second EditionBy Jeff Doyle - CCIE No.. Rout ing TCP/ I P, Volum e 1, Second Edit ion, includes pr ot ocol changes and Ciscofeat u

CCIE Professional Development Routing TCP/IP, Volume I, Second Edition

By Jeff Doyle - CCIE No 1919, Jennifer Carroll - CCIE No 1402

Publisher : Cisco Pr e ss Pub Dat e: Oct obe r 1 9 , 2 0 0 5

I SBN: 1 - 5 8 7 0 5 - 2 0 2 - 4 Pages: 9 3 6

Table of Cont ent s | I ndex

A det ailed exam inat ion of int er ior r out ing pr ot ocols - - com plet ely updat ed in a new edit ion

A com plet e r evision of t he best - selling fir st edit ion- - w idely consider ed a pr em ier t ext onTCP/ I P r out ing pr ot ocols

A cor e t ext book for CCI E pr epar at ion and a pr act ical r efer ence for net w or k designer s,adm inist r at or s, and engineer s

I ncludes configur at ion and t r oubleshoot ing lessons t hat w ould cost t housands t o lear n in aclassr oom and num er ous r eal- w or ld exam ples and case st udies

Pr aised in it s fir st edit ion for it s appr oachable st yle and w ealt h of infor m at ion, t his new edit ion

pr ovides r eader s a deep under st anding of I P r out ing pr ot ocols, t eaches how t o im plem ent

t hese pr ot ocols using Cisco r out er s, and br ings r eader s up t o dat e pr ot ocol and im plem ent at ionenhancem ent s Rout ing TCP/ I P, Volum e 1, Second Edit ion, includes pr ot ocol changes and Ciscofeat ur es t hat enhance r out ing int egr it y, secur e r out er s fr om at t acks init iat ed t hr ough r out ing

pr ot ocols, and pr ovide gr eat er cont r ol over t he pr opagat ion of r out ing infor m at ion for all t he I Pint er ior r out ing pr ot ocols Rout ing TCP/ I P, Volum e 1, Second Edit ion, pr ovides a det ailed

analysis of each of t he I P int er ior gat ew ay pr ot ocols ( I GPs) I t s st r uct ur e r em ains t he sam e as

t he best - selling fir st edit ion, t hough infor m at ion w it hin each sect ion is enhanced and m odified

t o include t he new developm ent s in r out ing pr ot ocols and Cisco im plem ent at ions What 's New

I n This Edit ion? The fir st edit ion cover s r out ing pr ot ocols as t hey exist ed in 1998 The newbook updat es all cover ed r out ing pr ot ocols and discusses new feat ur es int egr at ed in t he lat estver sion of Cisco I OS Soft w ar e I Pv6, it s use w it h int er ior r out ing pr ot ocols, and it s

int er oper abilit y and int egr at ion w it h I Pv4 ar e also int egr at ed int o t his book Appr oxim at ely 200pages of new infor m at ion ar e added t o t he m ain t ext , w it h som e old t ext r em oved Addit ionalexer cise and solut ions ar e also included

CCIE Professional Development Routing TCP/IP, Volume I, Second Edition

By Jeff Doyle - CCIE No 1919, Jennifer Carroll - CCIE No 1402

Publisher : Cisco Pr e ss Pub Dat e: Oct obe r 1 9 , 2 0 0 5

I SBN: 1 - 5 8 7 0 5 - 2 0 2 - 4 Pages: 9 3 6

Table of Cont ent s | I ndex

A det ailed exam inat ion of int er ior r out ing pr ot ocols - - com plet ely updat ed in a new edit ion

A com plet e r evision of t he best - selling fir st edit ion- - w idely consider ed a pr em ier t ext onTCP/ I P r out ing pr ot ocols

A cor e t ext book for CCI E pr epar at ion and a pr act ical r efer ence for net w or k designer s,adm inist r at or s, and engineer s

I ncludes configur at ion and t r oubleshoot ing lessons t hat w ould cost t housands t o lear n in aclassr oom and num er ous r eal- w or ld exam ples and case st udies

Pr aised in it s fir st edit ion for it s appr oachable st yle and w ealt h of infor m at ion, t his new edit ion

pr ovides r eader s a deep under st anding of I P r out ing pr ot ocols, t eaches how t o im plem ent

t hese pr ot ocols using Cisco r out er s, and br ings r eader s up t o dat e pr ot ocol and im plem ent at ionenhancem ent s Rout ing TCP/ I P, Volum e 1, Second Edit ion, includes pr ot ocol changes and Ciscofeat ur es t hat enhance r out ing int egr it y, secur e r out er s fr om at t acks init iat ed t hr ough r out ing

pr ot ocols, and pr ovide gr eat er cont r ol over t he pr opagat ion of r out ing infor m at ion for all t he I Pint er ior r out ing pr ot ocols Rout ing TCP/ I P, Volum e 1, Second Edit ion, pr ovides a det ailed

analysis of each of t he I P int er ior gat ew ay pr ot ocols ( I GPs) I t s st r uct ur e r em ains t he sam e as

t he best - selling fir st edit ion, t hough infor m at ion w it hin each sect ion is enhanced and m odified

t o include t he new developm ent s in r out ing pr ot ocols and Cisco im plem ent at ions What 's New

I n This Edit ion? The fir st edit ion cover s r out ing pr ot ocols as t hey exist ed in 1998 The newbook updat es all cover ed r out ing pr ot ocols and discusses new feat ur es int egr at ed in t he lat estver sion of Cisco I OS Soft w ar e I Pv6, it s use w it h int er ior r out ing pr ot ocols, and it s

int er oper abilit y and int egr at ion w it h I Pv4 ar e also int egr at ed int o t his book Appr oxim at ely 200pages of new infor m at ion ar e added t o t he m ain t ext , w it h som e old t ext r em oved Addit ionalexer cise and solut ions ar e also included

CCIE Professional Development Routing TCP/IP, Volume I, Second Edition

By Jeff Doyle - CCIE No 1919, Jennifer Carroll - CCIE No 1402

Publisher : Cisco Pr e ss Pub Dat e: Oct obe r 1 9 , 2 0 0 5

I SBN: 1 - 5 8 7 0 5 - 2 0 2 - 4 Pages: 9 3 6

Table of Cont ent s | I ndex

Copyright

About the Authors

About the Technical Reviewers

Acknowledgments

This Book Is Safari Enabled

Icons Used in This Book

Command Syntax Conventions

Part I: Routing Basics

Chapter 1 TCP/IP Review

TCP/IP Protocol Layers

IP Packet Header

IPv4 Addresses

Address Resolution Protocol (ARP)

Internet Control Message Protocol (ICMP)

Route Table

Configuring Static Routes

Troubleshooting Static Routes

Chapter 4 Dynamic Routing Protocols

Routing Protocol Basics

Distance Vector Routing Protocols

Link State Routing Protocols

Interior and Exterior Gateway Protocols

Static or Dynamic Routing?

Looking Ahead

Recommended Reading

Review Questions

Part II: Interior Routing Protocols

Chapter 5 Routing Information Protocol (RIP)

Chapter 10 Integrated IS-IS

Operation of Integrated IS-IS

Configuring Integrated IS-IS

Troubleshooting Integrated IS-IS

Part III: Route Control and Interoperability

Chapter 11 Route Redistribution

Fundamentals of On-Demand Routing

Configuring Default Routes and ODR

Looking Ahead

Summary Table: Chapter 12 Command Review Review Questions

Chapter 13 Route Filtering

Configuring Route Filters

Looking Ahead

Summary Table: Chapter 13 Command Review Configuration Exercises

Troubleshooting Exercises

Chapter 14 Route Maps

Basic Uses of Route Maps

Configuring Route Maps

Part IV: Appendixes

Appendix A Tutorial: Working with Binary and Hex Working with Binary Numbers

Working with Hexadecimal Numbers

Appendix B Tutorial: Access Lists

Access List Basics

Standard IP Access Lists

Extended IP Access Lists

Calling the Access List

Reflexive Access Lists

Keyword Alternatives

Named Access Lists

Prefix Lists

Filter Placement Considerations

Access List Monitoring and Accounting

Appendix C CCIE Preparation Tips

Laying the Foundations

Following the Certification Path

Hands-On Experience

Intensifying the Study

The Final Six Months

CCIE Professional Development Routing TCP/IP Volume

I Second Edition

Jeff Doyle, CCI E No 1919, Jennifer Car r oll, CCI E No 1402

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About the Authors

Je ff D oy le ( CCI E No 1919) specializes in I P r out ing pr ot ocols, MPLS, and I Pv6 He has designed

or assist ed in t he design of lar ge- scale I P ser vice pr ovider net w or ks t hr oughout Nor t h Am er ica,Eur ope, Japan, Kor ea, and t he People's Republic of China Jeff has pr esent ed num er ous

cor por at e sem inar s, and has also spoken at NANOG, JANOG, APRI COT, and at I Pv6 For um

confer ences Jeff holds a BA fr om Mem phis St at e Univer sit y, and st udied Elect r ical Engineer ing

at t he Univer sit y of New Mexico Jeff lives in Denver , Color ado

Je n n ife r Ca r r oll ( CCI E No 1402) is an independent net w or k consult ant in Redm ond,

Washingt on She has designed, im plem ent ed, and opt im ized m any TCP/ I P net w or ks, and hasdeveloped and t aught a var iet y of net w or king and int er net w or king cour ses on r out ing pr ot ocolsand Cisco r out er s over t he past 15 year s Jennifer can be cont act ed at j ennifer car r oll@ieee.or g

About the Technical Reviewers

Fr a n k Kn ox , Chief Technical Officer , has been w it h Skyline Com put er for a lit t le over six year s.

He is a dual CCI E ( CCI E No 3698: SNA/ I P and Rout ing/ Sw it ching) as w ell as a CCSI I n addit ion

t o his CTO r esponsibilit ies, Fr ank t eaches sever al advanced Cisco- r elat ed cour ses, including aone- w eek CCI E Lab Pr epar at ion Wor kshop He is consider ed t o be an exper t in m ainfr am e

at t ached r out er t echnologies and in t he t echnologies and issues associat ed w it h int egr at ednet w or king ( for exam ple, SNA/ I P and Voice/ Dat a) He has m or e t han 37 year s of net w or kingexper ience w it h I BM, GTE ( Ver izon) Dir ect or ies, and Skyline Com put er Cor p This exper ienceincludes field ser vice, field suppor t , pr oduct planning, m anagem ent , and all facet s of net w or kingeducat ion I n addit ion, he developed and t aught sever al cour ses for t he Univer sit y of DallasTelecom m unicat ions MBA pr ogr am Fr ank also has an MS degr ee in Telecom m unicat ions fr omPace Univer sit y ( 4.0 GPA)

Aft er w or king in var ious r oles as an engineer w it hin Cisco for t he past 6.5 year s, St e v e n

Edw a r d M oor e t r ansit ioned t o t he I P Rout ing Pr ot ocol Scalabilit y Team Ther e, his focus

encom passes all aspect s of ext ending net w or k and pr ot ocol scalabilit y: consider ing new feat ur esand opt im izat ions t o t he pr ot ocol ar chit ect ur e, designing t est s t o m easur e cur r ent pr ot ocolscalabilit y, w or king w it h cust om er s t o im plem ent scaling funct ionalit y in t heir net w or k, andpar t icipat ing in event s such as Net w or ker s t o educat e ot her s on how t o enhance t heir net w or k'sper for m ance and scalabilit y fr om t he r out ing per spect ive

Re n a Ya n g is a soft w ar e engineer at Cisco Syst em s She has m or e t han six year s of exper ience

im plem ent ing code in Cisco I OS She cur r ent ly w or ks on I S- I S Befor e t his, she focused on I Pv4,UDP, access list s, policy r out ing, and r out ing infr ast r uct ur e Rena holds a bachelor 's of scienceand m ast er s of engineer ing in com put er science fr om MI T

Many t hanks t o Br et t Bar t ow , Chr is Cleveland, Andr ew Cupp, San Dee Phillips, and all of t he st aff

of Cisco Pr ess w ho m ade t his book possible

The t echnical edit or s, St even Moor e, Rena Yang and Fr ank Knox, did a fant ast ic j ob We w ant t o

t hank t hem for t heir out st anding advice and r ecom m endat ions

We w ant t o t hank Fr ank Knox, Car l Pike, Chr is Tonini, and t he r est of t he em ployees of Skylabsnet w or ks Skylabs' lab set up and access t o t he lab is easy t o use and had ever yt hing w e needed

t o com plet e all t he configur at ions and case st udies in t his book

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Icons Used in This Book

Command Syntax Conventions

The convent ions used t o pr esent com m and synt ax in t his book ar e t he sam e convent ions used in

t he I OS Com m and Refer ence The Com m and Refer ence descr ibes t hese convent ions as follow s:

Boldfa ce indicat es com m ands and keyw or ds t hat ar e ent er ed lit er ally as show n I n act ual

configur at ion exam ples and out put ( not gener al com m and synt ax) , boldface indicat es

com m ands t hat ar e m anually input by t he user ( such as a sh ow com m and)

I t alics indicat e ar gum ent s for w hich you supply act ual values

Ver t ical bar s ( | ) separ at e alt er nat ive, m ut ually exclusive elem ent s

Squar e br acket s [ ] indicat e opt ional elem ent s

Br aces { } indicat e a r equir ed choice

Br aces w it hin br acket s [ { } ] indicat e a r equir ed choice w it hin an opt ional elem ent

I n 1976, w hen I saw m y fir st Ar panet I MP at Digit al Equipm ent Cor por at ion, net w or ks as w eknow t hem t oday w er e in t heir infancy SNA, XNS, and DECnet w er e under ear ly developm ent ,and packet sw it ching ver sus cir cuit sw it ching w as t he hot t opic of t he day Those of us involved

in t he design of t he sw it ching and r out ing algor it hm s w er e dealing w it h r out er s ( alt hough w edidn't call t hem t hat ) t hat had 64 kilobyt es of m em or y, dat a link of 56 kilobit s w er e consider edblindingly fast , and net w or ks w it h 256 nodes w er e big enough t hat if you w er e t he salesm an w hosold t hose 256 com put er s, you w ould r et ir e fabulously w ealt hy

Thir t y year s is a long t im e, and t oday t he individual net w or ks t hat m ake up t he I nt er net cont ain

t housands or t ens of t housands of nodes, w hile t he I nt er net as a w hole cont ains hundr eds of

m illions of com put er s Most st r iking in t he evolut ion over t his hum an gener at ion is t hat t hefoundat ions of t he I nt er net laid dow n in t he TCP/ I P pr ot ocol suit e have sur vived m ost ly int act

t hr ough four or m or e gener at ions of com put ing ar chit ect ur es, t hr ee com plet e gener at ions ofoper at ing syst em t echnology, and an incr ease of five or der s of m agnit ude in t r ansm ission

speeds

Yet , w e st ill t r eat r out ing in packet - sw it ched net w or ks as a black ar t Why is t hat ?

Fir st , designing r obust , scalable dist r ibut ed algor it hm s is har d Despit e our best int ent ions t o

m ake t hem sim ple, com plexit y cr eeps in t o deal w it h t he inevit able special cases, opt im izat ions,peculiar t opologies, and link t echnologies one encount er s Because a " for k lift upgr ade" of anent ir e net w or k is r ar ely feasible, w e have m ult iple gener at ions of t echnology pr esent

sim ult aneously, and w e m ust m aint ain backw ar d- com pat ibilit y w it h essent ially no disr upt ion t odeployed ser vices As policies gover ning t he r out ing of packet s becom e m or e sophist icat ed, ourabilit y t o devise aut om at ed discover y and configur at ion pr ocedur es get s over w helm ed, and w efall back on m anual configur at ion and per for m ance t uning t echniques Finally, as t he

envir onm ent in w hich t hese net w or ks ar e oper at ed has evolved fr om a cooper at ive one w her e

t r ust w as im plicit t o one in w hich t he net w or k is subj ect t o bot h inside and out side at t ack,

designing and deploying r out ing syst em s t hat can be m ade secur e has becom e an ur gent

r out ing The m ost popular I GPsRI P, EGRP, OSPF, and I SI Sar e cover ed in dept h Advanced t opics

in r out e r edist r ibut ion, r out e filt er ing, and policy r out ing r ound out Volum e 1

This second edit ion also adds essent ial m at er ial on I Pv6 as w ell as br inging all t he m at er ial up t odat e w it h exam ples and configur at ions for t he lat est r eleases of Cisco I OS

For anyone w ant ing a com pr ehensive under st anding of how r out ing in TCP/ I P net w or ks r eally

w or ks, fr om t he design pr inciples of r out ing algor it hm s, t o t he evolut ion of addr essing schem es,

t o t he pr act ical aspect s of designing and configur ing t he r out ing of lar ge aut onom ous syst em s,

t his is t he book for you

David Or an

Cisco Fellow

Rout ing is an essent ial elem ent of all but t he sm allest dat a com m unicat ions net w or ks At onelevel, r out ing and t he configur at ion of r out er s ar e quit e sim ple But as net w or ks gr ow in size andcom plexit y, r out ing issues can becom e at once bot h lar ge and subt le Per ver sely, per haps, w e

ar e gr at eful for t he difficult pr oblem s lar ge- scale r out ing can pr esent as net w or k syst em s

consult ant s, t hese pr oblem s ar e our br ead and but t er Wit hout t hem , t he phr ase " You w ant fr ies

w it h t hat ?" could be an unfor t unat e par t of our daily vocabular y

Cisco Cer t ified I nt er net w or k Exper t s ar e w idely r ecognized for t heir abilit y t o design,

t r oubleshoot , and m anage lar ge net w or ks This r ecognit ion com es fr om t he fact t hat you cannotbecom e a CCI E by at t ending a few classes and t hen r egur git at ing som e m em or ized fact s ont o a

w r it t en t est A CCI E has pr oven exper t ise in an int ense, fam ously difficult hands- on lab exam

This book is t he fir st of t w o volum es t hat focuses on TCP/ I P r out ing issues Ear ly in t he w r it ing of

t he fir st edit ion, Kim Lew , for m er Cisco Syst em s pr ogr am m anager , said, " Our obj ect ive is t o

m ake CCI Es, not t o m ake people w ho can pass t he CCI E lab." We ent ir ely agr ee w it h t hat

st at em ent and have used it as a guiding pr inciple t hr oughout t he w r it ing of t his book Alt hough

t he book includes m any case st udies and exer cises t o help you pr epar e for t he CCI E lab, m y

pr im ar y obj ect ive is t o incr ease your under st anding of I P r out ingbot h on a gener ic level and as it

is im plem ent ed on Cisco r out er s

The audience for t his book is any net w or k designer , adm inist r at or , or engineer w ho needs a fullunder st anding of t he int er ior r out ing pr ot ocols of TCP/ I P Alt hough t he pr act ical aspect s of t hebook focus on t he Cisco I OS, t he infor m at ion is applicable t o any r out ing plat for m

The book is not only for r eader s w ho plan t o becom e CCI Es, but for people w ho w ish t o advance

t heir know ledge of TCP/ I P r out ing These r eader s w ill fall int o one of t hr ee cat egor ies:

The " beginner s" w ho have som e basic net w or king know ledge and w ish t o begin a deep

st udy of net w or king

The int er m ediat e- level net w or king pr ofessionals w ho have exper ience w it h r out er s, Cisco or

ot her w ise, and plan t o advance t hat exper ience t o t he exper t level

The highly exper ienced net w or king exper t s These individuals have ext ensive hands- onexper t ise w it h Cisco r out er s and ar e r eady t o t ake t he CCI E lab; how ever , t hey w ant a

st r uct ur ed r eview and ser ies of exer cises for ver ificat ion and validat ion

CCI E Pr ofessional Developm ent : Rout ing TCP/ I P, Volum e I focuses pr im ar ily on int er m ediat level net w or king pr ofessionals w hile offer ing t o beginner s a st r uct ur ed out line of fundam ent alinfor m at ion and t o exper t s t he r equir ed challenges t o hone t heir skills

e-Changes from First Edition

Ther e ar e sever al fact or s influencing t he changes cont ained in t his second edit ion The fir stfact or is t he CCI E it self When I ( Jeff) w r ot e t he fir st edit ion of t his book, t he CCI Especifically

w hat is now called t he Rout ing and Sw it ching specialt y of t he CCI Ew as t he only cer t ificat ionCisco Syst em s offer ed Now , t her e is a ser ies of cer t ificat ions cr eat ing a pat h t o t he CCI E at t hepinnacle Mor eover , t he t ypical net w or king pr ofessional is m or e know ledgeable t han in 1997.Given t his, w e have elim inat ed t he fir st chapt er of t he or iginal book, w hich cover ed such ver ybasic concept s as t he definit ion of br idges and r out er s and net w or k addr esses ( When w as t helast t im e you even saw a br idge in a net w or k?)

The second fact or influencing t he changes in t his edit ion is t he changes in t he Cisco Syst em s

I OS I GRP, w hich w as fr equent ly used w hen t he fir st edit ion w as w r it t en, is now a legacy

pr ot ocol w hose m ain significance is as t he ancest or of EI GRP Ther efor e t he I GRP chapt er of t hefir st edit ion has been elim inat ed and I GRP is cover ed for hist or ical per spect ive ear ly in t he EI GRPchapt er The I OS com m and suit e it self has expanded t o accom m odat e new funct ions and

opt ions; w e have m ade ever y effor t t o include t he com m ands and pr ot ocol ext ensions t hat didnot exist in t he lat e 1990s

Last ly, a pr ot ocol t hat exist ed m ost ly only in pr oposal for m in 1997I Pv6is now in t he ear ly st ages

of w or ldw ide deploym ent You can expect t o need a det ailed know ledge of t his pr ot ocol and t heext ensions t o I P r out ing pr ot ocols t hat suppor t it in t he near fut ur e, if not alr eady, so t his secondedit ion delves deeply int o r out ing I Pv6

Ot her changes in t his edit ion ar e sem ant ic For exam ple, in t he fir st edit ion, I ( Jeff) m ade a point

of differ ent iat ing bet w een a " net w or k" as a dat a link and an " int er net w or k" as a set of net w or ksconnect ed by r out er s Alt hough t hat t er m inology is cer t ainly accur at e, it is clum sy, and

" int er net w or k" is seldom used t hese days I nst ead, " net w or k" usually r efer s t o ever yt hing fr om alocal link t o w or ldw ide aut onom ous syst em s oper at ed by t he likes of Level 3, NTT, and Spr int

We have at t em pt ed t o br ing t he t er m inology in t his edit ion up t o m oder n, com m on usage

The 14 chapt er s of t he book ar e divided int o t hr ee par t s

Par t I, " Rout ing Basics," exam ines t he basics of I Pv4 and I Pv6, and t he basics of r out ing

Alt hough m or e advanced r eader s m ay w ish t o skip t he fir st chapt er , w e r ecom m end t hat t hey atleast skim Chapt er 3, " St at ic Rout ing," and Chapt er 4, " Dynam ic Rout ing Pr ot ocols." And, ofcour se, if you ar e not yet fam iliar w it h I Pv6, Chapt er 2, " I Pv6 Over view ," is a m ust - r ead

Par t I I, " I nt er ior Rout ing Pr ot ocols," cover s t he I P I nt er ior Gat ew ay Pr ot ocols Each pr ot specific chapt er begins w it h a discussion of t he t heor y, m echanics, and par am et er s of t he

ocol-pr ot ocol This gener al over view is follow ed by case st udies on configur ing and t r oubleshoot ing

t he pr ot ocol using Cisco Syst em s' I OS in var ious net w or k t opologies

The Ext er ior Gat ew ay Pr ot ocol, BGP, and t opics such as m ult icast r out ing, Qualit y of Ser vice,

r out er secur it y and m anagem ent , and Net w or k Addr ess Tr anslat ion, ar e cover ed in " Rout ingTCP/ I P, Volum e I I "

Par t I I I, " Rout e Cont r ol and I nt er oper abilit y," exam ines t he t ools available for cr eat ing and

m anaging int er oper abilit y w it h m ult iple I P r out ing pr ot ocols, and also such t ools as default

r out es and r out e filt er ing As such, t he chapt er s of t his last par t pr ovide an int r oduct ion t o t he

t ools necessar y for building t he com plex r out ing policies int r oduced in Volum e I I These

chapt er s, like t he ones in Par t I I, begin w it h concept s and conclude w it h case st udies

Book Features

Most chapt er s conclude w it h a set of r eview quest ions, configur at ion exer cises, and

t r oubleshoot ing exer cises The r eview quest ions focus on t he t heor et ical aspect s of t he chapt er

t opic, w her eas t he configur at ion and t r oubleshoot ing exer cises addr ess Cisco- specific aspect s of

t he chapt er t opic

Also at t he end of each chapt er is a t able w it h a br ief descr ipt ion of all im por t ant Cisco I OScom m ands used in t hat chapt er The convent ions used t o pr esent t hese com m ands ar e t he sam econvent ions used in t he I OS Com m and Refer ence and pr esent ed ear lier in t his int r oduct ion

Part I: Routing Basics

Chapt er 1 TCP/ I P Review

Chapt er 2 I Pv6 Over view

Chapt er 3 St at ic Rout ing

Chapt er 4 Dynam ic Rout ing Pr ot ocols

Chapter 1 TCP/IP Review

This chapt er cover s t he follow ing subj ect s:

TCP/ I P Pr ot ocol Layer s

I P Packet Header

I Pv4 Addr esses

Addr ess Resolut ion Pr ot ocol ( ARP)

I nt er net Cont r ol Message Pr ot ocol ( I CMP)

Host - t o- Host Layer

Given t hat t he t it le of t his book is Rout ing TCP/ I P, it is fit t ing t o begin w it h a r eview of TCP/ I Pbefor e get t ing int o how t o r out e it Pr esum ably, if you ar e pr epar ing for a Cisco Cer t ified

I nt er net w or k Exper t ( CCI E) exam inat ion, or have j ust bought t his book as a r out ing r efer ence,you alr eady know m ost or all of t he infor m at ion in t his chapt er But r eview s never hur t andsom et im es help, so her e you have it

The pur pose of t his chapt er is t o r eview t he pr ot ocols t hat enable, cont r ol, or cont r ibut e t o t he

r out ing of TCP/ I P, not t o do an in- dept h st udy of t he TCP/ I P pr ot ocol suit e Sever al books on t he

r ecom m ended r eading list at t he end of t he chapt er cover t he subj ect in dept h Read at leastone

Conceived in t he ear ly 1970s by Vint Cer f and Bob Kahn, TCP/ I P and it s layer ed pr ot ocol

ar chit ect ur e pr edat es t he I SO's Open Syst em I nt er connect ion ( OSI ) r efer ence m odel A br ief

r eview of TCP/ I P's layer s w ill be useful in under st anding how t he var ious funct ions and ser vicesexam ined in t his chapt er int er r elat e