CCNP Enterprise Design ENSLD 300-420 Official Cert Guide: Designing Cisco Enterprise Networks (2020)

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CCNP Enterprise DesignENSLD 300-420 OfficialCert GuideDesigning Cisco EnterpriseNetworksAnthony Bruno, CCIE No. 2738Steve Jordan, CCIE No. 11293

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CCNP Enterprise Design ENSLD 300-420 OfficialCert Guide: Designing Cisco EnterpriseNetworksAnthony BrunoSteve JordanCopyright© 2021Published by:Cisco Pressand permission must be obtained from the publisherprior to any prohibited reproduction, storage in aretrieval system, or transmission in any form or by anymeans, electronic, mechanical, photocopying, recording,or likewise. For information regarding permissions,request forms, and the appropriate contacts within thePearson Education Global Rights & PermissionsDepartment, please visitwww.pearson.com/permissions.No patent liability is assumed with respect to the use ofthe information contained herein. Although everyprecaution has been taken in the preparation of thisbook, the publisher and author assume no responsibilityfor errors or omissions. Nor is any liability assumed fordamages resulting from the use of the informationcontained herein.ScoutAutomatedPrintCode

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Library of Congress Control Number: 2020906746ISBN-13: 978-0-13-657519-1ISBN-10: 0-13-657519-6Warning and DisclaimerThis book is designed to provide information about theCCNP Enterprise Design ENSLD 300-420 exam. Everyeffort has been made to make this book as complete andas accurate as possible, but no warranty or fitness isimplied.The information is provided on an "as is" basis. Theauthors, Cisco Press, and Cisco Systems, Inc. shall haveneither liability nor responsibility to any person or entitywith respect to any loss or damages arising from theinformation contained in this book or from the use of thediscs or programs that may accompany it.The opinions expressed in this book belong to the authorand are not necessarily those of Cisco Systems, Inc.Trademark AcknowledgmentsAll terms mentioned in this book that are known to betrademarks or service marks have been appropriatelycapitalized. Cisco Press or Cisco Systems, Inc., cannotattest to the accuracy of this information. Use of a termin this book should not be regarded as affecting thevalidity of any trademark or service mark.Special Sales

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For information about buying this title in bulkquantities, or for special sales opportunities (which mayinclude electronic versions; custom cover designs; andcontent particular to your business, training goals,marketing focus, or branding interests), please contactour corporate sales department atcorpsales@pearsoned.com or (800) 382-3419.For government sales inquiries, please contactgovernmentsales@pearsoned.com.For questions about sales outside the U.S., please contactintlcs@pearson.com.Feedback InformationAt Cisco Press, our goal is to create in-depth technicalbooks of the highest quality and value. Each book iscrafted with care and precision, undergoing rigorousdevelopment that involves the unique expertise ofmembers from the professional technical community.Readers' feedback is a natural continuation of thisprocess. If you have any comments regarding how wecould improve the quality of this book, or otherwise alterit to better suit your needs, you can contact us throughemail atfeedback@ciscopress.com. Please make sure toinclude the book title and ISBN in your message.We greatly appreciate your assistance.Editor-in-Chief:Mark Taub

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Alliances Manager, Cisco Press:Arezou GolDirector, Product Management:Brett BartowExecutive EditorNancy DavisManaging EditorSandra SchroederDevelopment EditorEllie BruProject EditorMandie FrankCopy EditorKitty WilsonTechnical EditorsKevin Yudong Wu, James HillEditorial AssistantCindy TeetersDesignerChuti PrasertsithCompositioncodeMantra

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IndexerProofreader

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About the AuthorsAnthony Bruno, CCIE No. 2738, is an architect andtechnical resource manager with British Telecom (BT)with more than 27 years of experience in theinternetworking field. Previously, he worked forInternational Network Services (INS) and LucentTechnologies, and he was a captain in the U.S. Air Force.He has consulted for many enterprise and serviceprovider customers in the design, implementation, andoptimization of large-scale networks. Anthony leadsarchitecture and design teams in building next-generation networks for customers.Anthony completed a master of science degree inelectrical engineering at the University of Missouri–Rollain 1994 and a bachelor of science in electricalengineering at the University of Puerto Rico–Mayaguezin 1990. For the past 20 years, he has coauthored fiveeditions of theCCDA Official Cert Guidefor Cisco Press.Outside work, Anthony enjoys running marathons andSpartan obstacle races, and he has finished sevenIronman distance triathlons. He is also an avidgenealogist and ancestry tree researcher. Anthony alsoenjoys piloting his Mavic Pro drone during trips.

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Steve Jordan, CCIE No. 11293, is a principalarchitect with J. Network Architects and has 23 years ofexperience in the field of internetworking. For the past10 years, Steve has specialized in data center andnetwork security architectures involving compute,network, security, storage, and virtualization. Over theyears, Steve has worked with many enterprise andservice provider customers in both presales andpostsales engineering and architecture roles, and he hasworked at several Cisco Gold Partners. He has extensiveexperience in data center and security architecturedesign and has implemented solutions in many financial,energy, retail, healthcare, education, andtelecommunications industries. Steve is a 15-year tripleCCIE in the tracks of Routing & Switching, StorageNetworking, and Data Center. His other certificationsinclude CCNA, CCNP Enterprise, VMware VCIX6-NV,and VCP6-NV.Steve lives in Houston, Texas, and when he is notworking on technology, he can be found traveling to newplaces, homebrewing, and trading stocks.Over the past 14 years, Steve has coauthored threeeditions of theCCDA Official Cert Guide.About the Technical ReviewersKevin Yudong Wu, CCIE No. 10697 (Routing &Switching and Security), is a senior network consultant

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at British Telecom (BT). He has been engaged as aleading engineer in various network design projects,including LAN, WLAN, data center, and network securitywith BT’s customers. Before joining BT, Kevin worked ascustomer support engineer at Cisco High TouchTechnical Support (HTTS), supporting both Cisco LANswitching and security products. He holds master’sdegrees in both computer science (University of Texas atArlington, 2003) and materials engineering (BeijingUniversity of Aeronautics and Astronautics, 1995).James Hill, CCIE No. 29455, CISSP, is a highlyrespected security professional with a career spanning 25years in the field of IT. Currently, he is the co-owner ofH5 Strategic Alliances, LLC, an IT consulting firm, andserves as the chief technology officer. H5 is committed toproviding an “intelligent IT” mindset while providingexpert-level professional services. H5’s focuses includescybersecurity, network access control, architecturaldesign, implementation, and support. James hasdesigned and implemented infrastructure and securitysolutions at several Fortune 500 companies within theUnited States. James has held the CISSP certificationsince 2004 and CCIE Security certification since 2011.

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DedicationsAnthony Bruno:This book is dedicated to my wife of 29 years, YvonneBruno, Ph.D., and to our daughters, Joanne and Dianne.Thanks for all of your support during the development ofthis book. And to my mom, Iris Bruno: Thank you forbeing a wonderful mother.Steve Jordan:This book is dedicated to my daughter, Blake, and mytwo sons, Lance and Miles, for always supporting meduring the development of this book. I also want todedicate this book to my mother, Frances Brennan, andmy good friend David Carswell Jr. for supporting me andproviding encouragement during the writing of thisbook.

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AcknowledgmentsThis book would not have been possible without theefforts of many dedicated people.I’d like to give special recognition to Ellie Bru,development editor, for providing her expert technicalknowledge in editing the book. Thanks to Kitty Wilson,Brett Bartow and Cindy Teeters for your support.And thanks to my coauthor, Steve Jordan, for workingwith me again on developing this book. And a specialthanks to the technical reviewers, Kevin Wu and JamesHill; your technical reviews, comments, and attention todetail made this book accurate.—Anthony BrunoThis book would not have been possible without all thegreat people who have assisted me. I would first like tothank Anthony Bruno for inviting me to assist him in thisendeavor once more. Thanks to Brett Bartow, executiveeditor, for his guidance and support during the book’sdevelopment. Thanks again to Ellie Bru, developmenteditor, for supporting my schedule delays and keepingme on track.Special thanks to the technical reviewers of this book,

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James Hill and Kevin Wu, who provided wisdom andhelped with keeping the book accurate.Finally, thanks to all the managers and marketing peopleat Cisco Press who make all these books possible.—Steve Jordan

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Contents at a GlanceIntroductionChapter 1. Internet Protocol Version 4 (IPv4)DesignChapter 2. Internet Protocol Version 6 (IPv6)DesignChapter 3. Routing Protocol Characteristics,EIGRP, and IS-ISChapter 4. OSPF, BGP, and RouteManipulationChapter 5. IP Multicast and NetworkManagementChapter 6. Enterprise LAN Design andTechnologiesChapter 7. Advanced Enterprise CampusDesignChapter 8. WAN for the EnterpriseChapter 9. WAN Availability and QoSChapter 10. SD-Access DesignChapter 11. SD-WAN DesignChapter 12. Automation

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Chapter 13. Final PreparationAppendix A. OSI Model, TCP/IP Architecture,and Numeric ConversionAppendix B. Answers to the “Do I Know ThisAlready?” Quiz Questions Q&A QuestionsAppendix C. CCNP Enterprise Design ENSLD300-420 Official Cert Guide Exam UpdatesAppendix D. Memory TablesAppendix E. Memory Tables Answer KeyAppendix F. Study PlannerGlossary

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Reader ServicesOther FeaturesRegister your copy atwww.ciscopress.com/title/9780136575191 for convenientaccess to downloads, updates, and corrections as theybecome available. To start the registration process, go towww.ciscopress.com/register and log in or create anaccount.* Enter the product ISBN 9780136575191 andclick Submit. When the process is complete, you will findany available bonus content under Registered Products.*Be sure to check the box saying that you would like to hear from us toreceive exclusive discounts on future editions of this product.

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ContentsIntroductionGoals and MethodsWho Should Read This Book?Strategies for Exam PreparationThe Companion Website for OnlineContent ReviewHow This Book Is OrganizedCertification Exam Topics and This BookChapter 1. Internet Protocol Version 4 (IPv4)Design“Do I Know This Already?” QuizFoundation TopicsIPv4 HeaderIPv4 AddressingIPv4 Address SubnetsIPv4 Addressing DesignAddress Assignment and Name ResolutionReferences and Recommended ReadingsExam Preparation Tasks

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Review All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 2. Internet Protocol Version 6 (IPv6)Design“Do I Know This Already?” QuizFoundation TopicsIntroduction to IPv6IPv6 HeaderIPv6 Address RepresentationIPv6 Address Scope Types and AddressAllocationsIPv6 MechanismsIPv6 Routing ProtocolsIPv4-to-IPv6 Migration Strategies andDeployment ModelsReferences and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&A

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Chapter 3. Routing Protocol Characteristics,EIGRP, and IS-IS“Do I Know This Already?” QuizFoundation TopicsRouting Protocol CharacteristicsRouting Protocol Metrics and LoopPreventionEIGRPIS-ISReferences and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 4. OSPF, BGP, and RouteManipulation“Do I Know This Already?” QuizFoundation TopicsOSPFv2OSPFv3BGPRoute Manipulation

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References and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 5. IP Multicast and NetworkManagement“Do I Know This Already?” QuizFoundation TopicsIP Multicast ReviewNetwork Management DesignReferences and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 6. Enterprise LAN Design andTechnologies“Do I Know This Already?” QuizFoundation Topics

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Hierarchical Network ModelsLAN MediaSpanning Tree Protocol DesignConsiderationsReferences and Recommended ReadingExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 7. Advanced Enterprise CampusDesign“Do I Know This Already?” QuizFoundation TopicsCampus LAN Design and Best PracticesHigh Availability Network ServicesReferences and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&A

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Chapter 8. WAN for the Enterprise“Do I Know This Already?” QuizFoundation TopicsWAN OverviewWAN Transport TechnologiesSite-to-Site VPN DesignReferences and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 9. WAN Availability and QoS“Do I Know This Already?” QuizFoundation TopicsWAN Design MethodologiesDesign for High AvailabilityInternet ConnectivityBackup ConnectivityQoS StrategiesDesigning End-to-End QoS PoliciesReferences and Recommended Readings

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Exam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 10. SD-Access Design“Do I Know This Already?” QuizFoundation TopicsSD-Access ArchitectureSD-Access Fabric Design Considerationsfor Wired and Wireless AccessReferences and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 11. SD-WAN Design“Do I Know This Already?” QuizFoundation TopicsSD-WAN ArchitectureSD-WAN Design Considerations

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References and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 12. Automation“Do I Know This Already?” QuizFoundation TopicsIntroduction to Network APIs andProtocolsYANG, NETCONF, and RESTCONFExploredIETF, OpenConfig, and Cisco YANGModelsModel-Driven TelemetryReferences and Recommended ReadingsExam Preparation TasksReview All Key TopicsComplete Tables and Lists from MemoryDefine Key TermsQ&AChapter 13. Final Preparation

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Getting ReadyTools for Final PreparationSuggested Plan for Final Review/StudySummaryAppendix A. OSI Model, TCP/IP Architecture,and Numeric ConversionAppendix B. Answers to the “Do I Know ThisAlready?” Quiz Questions Q&A Questions“Do I Know This Already?” AnswersQuiz AnswersAppendix C. CCNP Enterprise Design ENSLD300-420 Official Cert Guide Exam UpdatesAlways Get the Latest at the Book’s ProductPageTechnical ContentAppendix D. Memory TablesAppendix E. Memory Tables Answer KeyAppendix F. Study PlannerGlossary

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Icons Used in This Book

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Command Syntax ConventionsThe conventions used to present command syntax in thisbook are the same conventions used in the IOSCommand Reference. The Command Referencedescribes these conventions as follows:•Boldfaceindicates commands and keywords thatare entered literally as shown. In actualconfiguration examples and output (not generalcommand syntax), boldface indicates commandsthat are manually input by the user (such as ashowcommand).•Italicindicates arguments for which you supplyactual values.• Vertical bars (|) separate alternative, mutuallyexclusive elements.• Square brackets ([ ]) indicate an optional element.• Braces ({ }) indicate a required choice.• Braces within brackets ([{ }]) indicate a requiredchoice within an optional element.

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IntroductionCongratulations! If you are reading this Introduction,then you have probably decided to obtain a Ciscocertification. Obtaining a Cisco certification will ensurethat you have a solid understanding of common industryprotocols along with Cisco’s device architecture andconfiguration. Cisco has a high network infrastructuremarket share of routers, switches, and firewalls, and aglobal footprint.Professional certifications have been an important partof the computing industry for many years and willcontinue to become more important. Many reasons existfor these certifications, but the most popularly citedreason is that they show the holder’s credibility. All otherfactors being equal, a certified employee/consultant/jobcandidate is considered more valuable than one who isnot certified.Cisco provides three levels of certifications: CiscoCertified Network Associate (CCNA), Cisco CertifiedNetwork Professional (CCNP), and Cisco CertifiedInternetwork Expert (CCIE). Cisco made changes to allthree certifications, effective February 2020. Thefollowing are the most notable of the many changes:

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• The exams now include additional topics, such asprogramming.• The CCNA certification is no longer a prerequisitefor obtaining the CCNP certification.• CCNA specializations are not being offeredanymore.• The exams test a candidate’s ability to configureand troubleshoot network devices in addition to thecandidate’s ability to answer multiple-choicequestions.• The CCNP is obtained by taking and passing a Coreexam and a Concentration exam.• The CCIE certification requires candidates to passthe Core written exam before the CCIE lab can bescheduled.CCNP Enterprise candidates need to take and pass theImplementing and Operating Cisco Enterprise NetworkCore Technologies ENCOR 350-401 examination. Thenthey need to take and pass one of the followingConcentration exams to obtain their CCNP Enterprisecertification:•300-410 ENARSI:Implementing CiscoEnterprise Advanced Routing and Services(ENARSI)•300-415 ENSDWI:Implementing Cisco SD-

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WAN Solutions (SDWAN300)•300-420 ENSLD:Designing Cisco EnterpriseNetworks (ENSLD)•300-425 ENWLSD:Designing Cisco EnterpriseWireless Networks (ENWLSD)•300-430 ENWLSI:Implementing CiscoEnterprise Wireless Networks (ENWLSI)•300-435 ENAUTO:Implementing Automationfor Cisco Enterprise Solutions (ENAUI)This book helps you study for the Designing CiscoEnterprise Networks (ENSLD 300-420) exam. When youtake the exam, you are allowed 90 minutes to completeabout 60 questions. Testing is done at Pearson VUEtesting centers.Be sure to visitwww.cisco.com to find the latestinformation on CCNP Concentration requirements andto keep up to date on any new Concentration exams thatare announced.GOALS AND METHODSThe most important and somewhat obvious goal of thisbook is to help you pass the ENSLD 300-420 exam. Infact, if the primary objective of this book were different,then the book’s title would be misleading; however, themethods used in this book to help you pass the ENSLD

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