CCNP Enterprise Design ENSLD 300-420 Official Cert Guide (2024)

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CCNP Enterprise Design ENSLD 300-420Official Cert GuideSecond EditionCompanion Website and Pearson Test Prep Access CodeAccess interactive study tools on this book’s companion website, including practice test software,review exercises, Key Term flash card application, a study planner, and more!To access the companion website, simply follow these steps:1.Go to www.ciscopress.com/register.2.Enter theprint book ISBN: 9780138247263.3.Answer the security question to validate your purchase.4.Go to your account page.5.Click on theRegistered Productstab.6.Under the book listing, click on theAccess Bonus Contentlink.When you register your book, your Pearson Test Prep practice test access code will automati-cally be populated with the book listing under the Registered Products tab. You will need thiscode to access the practice test that comes with this book. You can redeem the code atPearsonTestPrep.com. Simply choose Pearson IT Certification as your product group and loginto the site with the same credentials you used to register your book. Click theActivate NewProductbutton and enter the access code. More detailed instructions on how to redeem youraccess code for both the online and desktop versions can be found on the companion website.If you have any issues accessing the companion website or obtaining your Pearson Test Preppractice test access code, you can contact our support team by going topearsonitp.echelp.org.

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Cisco PressCCNPEnterpriseDesignENSLD 300-420OfficialCert GuideSecond EditionANTHONY BRUNO, CCIE NO. 2738STEVE JORDAN, CCIE NO. 11293

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ivCCNPEnterpriseDesignENSLD300-420OfficialCertGuideCCNP Enterprise Design ENSLD 300-420Official Cert Guide, Second EditionAnthony BrunoSteve JordanCopyright© 2024 Pearson Education, Inc.Published by:Cisco PressHoboken, New JerseyAll rights reserved. No part of this book may be reproduced or transmitted in any form or by any means,electronic or mechanical, including photocopying, recording, or by any information storage and retrievalsystem, without written permission from the publisher, except for the inclusion of brief quotations in areview.$PrintCodeLibrary of Congress Control Number:2023949622ISBN-13: 978-0-13-824726-3ISBN-10: 0-13-824726-9Warning and DisclaimerThis book is designed to provide information about the CCNP Enterprise Design ENSLD 300-420 exam.Every effort has been made to make this book as complete and as accurate as possible, but no warranty orfitness is implied.The information is provided on an “as is” basis. The authors, Cisco Press, and Cisco Systems, Inc. shall haveneither liability nor responsibility to any person or entity with respect to any loss or damages arising fromthe information contained in this book or from the use of the discs or programs that may accompany it.The opinions expressed in this book belong to the author and are not necessarily those of CiscoSystems, Inc.Trademark AcknowledgmentsAll terms mentioned in this book that are known to be trademarks or service marks have been appropriatelycapitalized. Cisco Press or Cisco Systems, Inc., cannot attest to the accuracy of this information. Use of aterm in this book should not be regarded as affecting the validity of any trademark or service mark.Special SalesFor information about buying this title in bulk quantities, or for special sales opportunities (whichmay include electronic versions; custom cover designs; and content particular to your business, traininggoals, marketing focus, or branding interests), please contact our corporate sales department atcorpsales@pearsoned.com or (800) 382-3419.For government sales inquiries, please contact governmentsales@pearsoned.com.For questions about sales outside the U.S., please contact intlcs@pearson.com.

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vFeedback InformationAt Cisco Press, our goal is to create in-depth technical books of the highest quality and value. Each bookis crafted with care and precision, undergoing rigorous development that involves the unique expertise ofmembers from the professional technical community.Readers' feedback is a natural continuation of this process. If you have any comments regarding how wecould improve the quality of this book, or otherwise alter it to better suit your needs, you can contact usthrough email at feedback@ciscopress.com. Please make sure to include the book title and ISBN in yourmessage.We greatly appreciate your assistance.Vice President, IT Professional: Mark TaubAlliance Manager:Caroline AntonioDirector, ITP Product Management: Brett BartowExecutive Editor: Nancy DavisManaging Editor: Sandra SchroederDevelopment Editor: Ellie BruSenior Project Editor: Tonya SimpsonCopy Editor: Chuck HutchinsonTechnical Editor: Kevin Yudong WuEditorial Assistant: Cindy TeetersCover Designer: Chuti PrasertsithComposition: codeMantraIndexer: Charlotte KughenProofreader: Timothy Wright

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viCCNPEnterpriseDesignENSLD300-420OfficialCertGuidePearson’s Commitment to Diversity, Equity,and InclusionPearson is dedicated to creating bias-free content that reflects the diversity of all learners. Weembrace the many dimensions of diversity, including but not limited to race, ethnicity, gender,socioeconomic status, ability, age, sexual orientation, and religious or political beliefs.Education is a powerful force for equity and change in our world. It has the potential todeliver opportunities that improve lives and enable economic mobility. As we work withauthors to create content for every product and service, we acknowledge our responsibil-ity to demonstrate inclusivity and incorporate diverse scholarship so that everyone canachieve their potential through learning. As the world’s leading learning company, we havea duty to help drive change and live up to our purpose to help more people create abetter life for themselves and to create a better world.Our ambition is to purposefully contribute to a world where■■Everyone has an equitable and lifelong opportunity to succeed through learning.■■Our educational products and services are inclusive and represent the rich diversityof learners.■■Our educational content accurately reflects the histories and experiences ofthelearners we serve.■■Our educational content prompts deeper discussions with learners and motivatesthem to expand their own learning (and worldview).While we work hard to present unbiased content, we want to hear from you about anyconcerns or needs with this Pearson product so that we can investigate and address them.■Please contact us with concerns about any potential bias at https://www.pearson.com/report-bias.html.

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viiAbout the AuthorsAnthony Bruno,CCIE No. 2738, is an enterprise architect with British Telecom (BT) withmore than 30 years of experience in the internetworking field. Previously, he worked forInternational Network Services (INS) and Lucent Technologies, and he was a captain inthe U.S. Air Force. He has consulted for many enterprise and service provider customersin the design, implementation, and optimization of large-scale networks. Anthony leadsarchitecture and design teams in building next-generation networks for customers.Anthony completed a master of science degree in electrical engineering at the Universityof Missouri–Rolla in 1994 and a bachelor of science in electrical engineering at the Uni-versity of Puerto Rico–Mayaguez in 1990. For the past 23 years, he has coauthoredCCNPEnterprise Design ENSLD 300-420 Official Cert Guide: Designing Cisco EnterpriseNetworksand five editions of theCCDA Official Cert Guidefor Cisco Press.Outside work, Anthony enjoys running marathons and Spartan obstacle races, and he hasfinished eight Ironman distance triathlons. He is also an avid genealogist and ancestrytree researcher. As an FAA certified remote pilot, Anthony also enjoys piloting his droneat home and when traveling.Steve Jordan,CCIE No. 11293, is a principal architect with J. Network Architects andhas 26 years of experience in the field of internetworking. For the last 16 years, Steve hasspecialized in data center and network security architectures involving compute, network,security, storage, and virtualization. Over the years, Steve has consulted with many enter-prise and service provider customers in both pre-sales and post-sales engineering andarchitecture roles, along with working at several Cisco Gold Partners. He has extensiveexperience in data center and security architecture design and has implemented solutionsin many energy, financial, gaming, healthcare, hospitality, and telecommunications indus-tries. Steve is a 20-Year triple CCIE in the tracks of Enterprise Infrastructure, StorageNetworking, and Data Center. His other certifications include CCNA, CCNP Enterprise,VMware VCIX6-NV, and VCP6-NV.Steve lives in Houston, Texas, and when he is not working on technology, Steve can befound traveling to new places, enjoying sporting events, attending concerts, and tradingstocks.For the past 17 years, Steve has also coauthoredCCNP Enterprise Design ENSLD300-420 Official Cert Guide: Designing Cisco Enterprise Networksand three editionsof theCCDA Official Cert Guide.

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viiiCCNPEnterpriseDesignENSLD300-420OfficialCertGuideAbout the Technical ReviewerKevin Yudong Wu,CCIE No. 10697 (Routing & Switching and Security), is a principalarchitect at AT&T Consulting. He has been engaged as a leading engineer in various net-work design projects, including LAN, WLAN, data center, and network security. Beforejoining AT&T, Kevin worked as a senior consultant at British Telecom (BT) and customersupport engineer at Cisco High Touch Technical Support (HTTS), where he supportedboth Cisco LAN switching and security products. He holds master’s degrees in bothcomputer science (University of Texas at Arlington, 2003) and materials engineering(Beijing University of Aeronautics and Astronautics, 1995).

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ixDedicationsAnthony Bruno:This book is dedicated to my wife of 32 years, Yvonne Bruno, Ph.D. Thank you for allyour support during the development of this book.Steve Jordan:This book is dedicated to my love, Jelilian Jinang, for always supporting me during thedevelopment of this book. I also want to dedicate this book to my mother, FrancesBrennan, and my dad, Steve Miller, for supporting me and providing encouragementduring the writing of this book.

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xCCNPEnterpriseDesignENSLD300-420OfficialCertGuideAcknowledgmentsThis book would not have been possible without the efforts of many dedicated people.I’d like to give special recognition to Ellie Bru, development editor, for providing herexpert technical knowledge in editing the book. Thanks to Tonya Simpson, Nancy Davis,Brett Bartow, and Cindy Teeters for your support.And thanks to my coauthor, Steve Jordan, for working with me again on developing thisbook. And a special thanks to the technical reviewer, Kevin Wu; your technical review,comments, and attention to detail made this book accurate.—Anthony BrunoThis book would not have been possible without all the great people who have assistedme. I would first like to thank Anthony Bruno for inviting me to assist him in thisendeavor once more. Thanks to Brett Bartow, Nancy Davis, and Tonya Simpson, fortheir guidance and support during the book’s development. Thanks again to Ellie Bru,development editor, for supporting my schedule delays and keeping me on track.Special thanks to the technical reviewer of this book, Kevin Wu, who provided wisdomand helped with keeping the book accurate.Finally, thanks to all the managers and marketing people at Cisco Press who make allthese books possible.—Steve Jordan

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xiContents at a GlanceIntroductionxxxiChapter 1Internet Protocol Version 4 (IPv4) Design2Chapter 2Internet Protocol Version 6 (IPv6) Design44Chapter 3Routing Protocol Characteristics, EIGRP, and IS-IS90Chapter 4OSPF, BGP, and Route Manipulation132Chapter 5IP Multicast and Network Management180Chapter 6Enterprise LAN Design and Technologies214Chapter 7Advanced Enterprise Campus Design250Chapter 8WAN for the Enterprise280Chapter 9WAN Availability and QoS310Chapter 10SD-Access Design334Chapter 11SD-WAN Design360Chapter 12Automation390Chapter 13Final Preparation416Chapter 14CCNP Enterprise Design ENSLD 300-420 Official Cert Guide ExamUpdates422Appendix AAnswers to the “Do I Know This Already?” Quiz Questions andQ&A Questions426Appendix BOSI Model, TCP/IP Architecture, and Numeric Conversion452Glossary466Index476Online Elements:Appendix CMemory TablesAppendix DMemory Tables Answer KeyAppendix EStudy PlannerGlossary

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xiiCCNPEnterpriseDesignENSLD300-420OfficialCertGuideReader ServicesRegister your copy at www.ciscopress.com/title/9780138247263 for convenient accessto downloads, updates, and corrections as they become available. To start the registrationprocess, go to www.ciscopress.com/register and log in or create an account.* Enter theproduct ISBN 9780138247263 and clickSubmit. When the process is complete, you willfind any available bonus content under Registered Products.*Be sure to check the box saying that you would like to hear from us to receive exclusivediscounts on future editions of this product.

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xiiiContentsIntroductionxxxiChapter 1Internet Protocol Version 4 (IPv4) Design2“Do I Know This Already?” Quiz2Foundation Topics4IPv4 Header5ToS7IPv4 Fragmentation10IPv4 Addressing11IPv4 Address Classes12Class A Addresses12Class B Addresses13Class C Addresses13Class D Addresses13Class E Addresses13IPv4 Address Types13IPv4 Private Addresses14NAT14IPv4 Address Subnets17Mask Nomenclature17IP Address Subnet Design Example18Determining the Network Portion of an IP Address19Variable-Length Subnet Masking19VLSM Address Assignment: Example 120Loopback Addresses21IP Telephony Networks22VLSM Address Assignment: Example 222IPv4 Addressing Design24Goals of IPv4 Address Design24Planning for Future Use of IPv4 Addresses24Performing Route Summarization24Planning for a Hierarchical IP Address Network25Private and Public IP Address and NAT Guidelines26Steps for Creating an IPv4 Address Plan27Case Study: IP Address Subnet Allocation28Address Assignment and Name Resolution29Recommended Practices of IP Address Assignment30

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xivCCNPEnterpriseDesignENSLD300-420OfficialCertGuideBOOTP30DHCP30DNS32ARP34References and Recommended Readings35Exam Preparation Tasks37Review All Key Topics37Complete Tables and Lists from Memory37Define Key Terms37Q&A38Chapter 2Internet Protocol Version 6 (IPv6) Design44“Do I Know This Already?” Quiz44Foundation Topics47Introduction to IPv647IPv6 Header48IPv6 Address Representation50IPv4-Mapped IPv6 Addresses51IPv6 Prefix Representation51IPv6 Address Scope Types and Address Allocations52IPv6 Address Allocations52IPv6 Unicast Addresses53Global Unicast Addresses53Link-Local Addresses54Unique Local IPv6 Address54Global Aggregatable IPv6 Address55IPv4-Compatible IPv6 Addresses55IPv4-Mapped IPv6 Addresses55IPv6 Anycast Addresses55IPv6 Multicast Addresses56IPv6 Mechanisms58ICMPv658IPv6 Neighbor Discovery Protocol59IPv6 Name Resolution60Path MTU Discovery61IPv6 Address-Assignment Strategies61Manual Configuration61SLAAC of Link-Local Address61

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Contents xvSLAAC of Globally Unique IPv6 Address62DHCPv663DHCPv6 Lite63IPv6 Security63IPv6 Routing Protocols64RIPng64EIGRP for IPv664OSPFv364IS-IS for IPv664BGP4 Multiprotocol Extensions (MP-BGP) for IPv665IPv6 Addressing Design65Planning for Addressing with IPv665Route Summarization with IPv665IPv6 Private Addressing66IPv6 for the Enterprise66IPv6 Address Allocation66Partly Linked IPv4 Address into IPv667Whole IPv4 Address Linked to IPv667IPv6 Addresses Allocated per Location and/or Type67IPv4-to-IPv6 Migration Strategies and Deployment Models68Dual-Stack Migration Strategy68IPv6 over IPv4 Tunneling Strategy69Manual Configured Tunnels and GRE Tunnels69Automatic Tunnel Mechanisms696to4 Tunnels696RD Tunnels70IPv6 ISATAP Tunnels70IPv6/IPv4 Translation Strategy71DNS6471NAT6471Stateless NAT6471Stateful NAT6471IPv6 Deployment Models73Dual-Stack Model73Hybrid Model74Service Block Model75IPv6 Deployment Model Comparison76IPv6 Comparison with IPv476

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xviCCNPEnterpriseDesignENSLD300-420OfficialCertGuideReferences and Recommended Readings77Exam Preparation Tasks80Review All Key Topics80Complete Tables and Lists from Memory80Define Key Terms81Q&A81Chapter 3Routing Protocol Characteristics, EIGRP, and IS-IS90“Do I Know This Already?” Quiz90Foundation Topics92Routing Protocol Characteristics92Static Versus Dynamic Route Assignment93Interior Versus Exterior Routing Protocols94Distance-Vector Routing Protocols95EIGRP96Link-State Routing Protocols96Distance-Vector Routing Protocols Versus Link-State Protocols96Hierarchical Versus Flat Routing Protocols97Classless Versus Classful Routing Protocols97IPv4 Versus IPv6 Routing Protocols98Administrative Distance99Routing Protocol Metrics and Loop Prevention100Hop Count100Bandwidth101Cost101Load102Delay103Reliability103Maximum Transmission Unit103Routing Loop-Prevention Schemes104Split Horizon104Poison Reverse104Counting to Infinity105Triggered Updates105Summarization105EIGRP105EIGRP Components106Protocol-Dependent Modules106

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Neighbor Discovery and Recovery106RTP107DUAL107EIGRP Timers109EIGRP Metrics109EIGRP Packet Types110EIGRP Design111EIGRP Scaling Techniques111EIGRP Stub Routers112EIGRP Variance Command113EIGRP for IPv4 Summary113EIGRP for IPv6 (EIGRPv6) Networks114EIGRP for IPv6 Design114EIGRP in the Data Center115EIGRP for IPv6 Summary115IS-IS116IS-IS Metrics116IS-IS Operation and Design117IS-IS NET Addressing117IS-IS DRs117IS-IS Interface Types117IS-IS Area Design118IS-IS Authentication119IS-IS for IPv6120IS-IS Summary121References and Recommended Readings121Exam Preparation Tasks122Review All Key Topics122Complete Tables and Lists from Memory123Define Key Terms123Q&A123Chapter 4OSPF, BGP, and Route Manipulation132“Do I Know This Already?” Quiz132Foundation Topics134OSPFv2134OSPFv2 Metric135OSPFv2 Adjacencies and Hello Timers135Contentsxvii

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xviiiCCNPEnterpriseDesignENSLD300-420OfficialCertGuideOSPF Message Types136OSPFv2 Areas137OSPF Area Design Considerations137OSPF Router Types138OSPF DRs140LSA Types140Autonomous System External Path Types141OSPF Stub Area Types142Stub Areas142Totally Stubby Areas142NSSAs143Virtual Links143OSPFv2 Router Authentication143OSPFv2 Summary144OSPFv3144OSPFv3 Changes from OSPFv2145OSPFv3 Areas and Router Types145OSPFv3 LSAs146OSPFv3 Summary148BGP148BGP Neighbors149eBGP149iBGP150Route Reflectors151Confederations152BGP Administrative Distance154BGP Attributes, Weight, and the BGP Decision Process154BGP Path Attributes154Next-Hop Attribute154Local Preference Attribute154Origin Attribute155Autonomous System Path (AS_Path) Attribute155MED Attribute156Community Attribute157Atomic Aggregate and Aggregator Attributes157Weight Attribute157BGP Decision Process158

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BGP Route Manipulation and Load Balancing160eBGP Multihop161BGP Multipath161BGP Summary161Route Manipulation161PBR162Route Summarization162Route Redistribution164Default Metric167OSPF Redistribution167Route Filtering167Transit Traffic168Bidirectional Forwarding Detection (BFD)168Graceful Restart and Non-Stop Routing169Virtual Routing and Forwarding (VRF)169References and Recommended Readings169Exam Preparation Tasks170Review All Key Topics170Complete Tables and Lists from Memory171Define Key Terms171Q&A171Chapter 5IP Multicast and Network Management180“Do I Know This Already?” Quiz180Foundation Topics182IP Multicast Review182Multicast Addresses182Layer 3 to Layer 2 Mapping183IGMP184IGMPv1184IGMPv2184IGMPv3185CGMP185IGMP Snooping186Sparse Versus Dense Multicast186Multicast Source and Shared Trees187PIM187PIM-SM187Contentsxix

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xxCCNPEnterpriseDesignENSLD300-420OfficialCertGuidePIM DR188Auto-RP188BIDIR-PIM188PIM-SSM189MSDP189Summary of Multicast Protocols189IPv6 Multicast Addresses190Network Management Design190SNMP191SNMP Components191Network Management Design Considerations192In-Band Versus Out-of-Band Network Management192Network Management Traffic Prioritization192MIB192SNMP Versions194SNMPv1194SNMPv2194SNMPv3195Other Network Management Technologies196RMON196RMON2197NetFlow197NetFlow Compared to RMON and SNMP200CDP201LLDP202Syslog202References and Recommended Readings203Exam Preparation Tasks205Review All Key Topics205Complete Tables and Lists from Memory205Define Key Terms206Q&A206Chapter 6Enterprise LAN Design and Technologies214“Do I Know This Already?” Quiz214Foundation Topics216Hierarchical Network Models216Benefits of the Hierarchical Model216

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Hierarchical Network Design217Core Layer218Distribution Layer218Access Layer219Hierarchical Model Examples221VSS222Hub-and-Spoke Design222Collapsed Core Design223Building Triangles and Redundant Links224Local Versus End-to-End VLAN Design Models225LAN Media225Ethernet Design Rules226100 Mbps Fast Ethernet Design Rules226Gigabit Ethernet Design Rules2271000BASE-LX Long-Wavelength Gigabit Ethernet2281000BASE-SX Short-Wavelength Gigabit Ethernet2281000BASE-CX Gigabit Ethernet over Coaxial Cable2281000BASE-T Gigabit Ethernet over UTP22810 Gigabit Ethernet Design Rules22910 Gigabit Ethernet Media Types229EtherChannel230Port Aggregation Considerations231Comparison of Campus Media231Power over Ethernet (PoE)232Spanning Tree Protocol and Layer 2 Security Design Considerations232Spanning Tree Protocol Metrics233PVST+234Rapid PVST+234Alignment of Spanning Tree Protocol with FHRP234MST234Cisco Spanning Tree Protocol Toolkit235PortFast235UplinkFast235BackboneFast235Loop Guard236Root Guard236BPDU Guard236Contentsxxi

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xxiiCCNPEnterpriseDesignENSLD300-420OfficialCertGuideBPDU Filter236Unidirectional Link Detection (UDLD) Protocol237Layer 2 Security238References and Recommended Readings239Exam Preparation Tasks240Review All Key Topics240Complete Tables and Lists from Memory240Define Key Terms240Q&A240Chapter 7Advanced Enterprise Campus Design250“Do I Know This Already?” Quiz250Foundation Topics251Campus LAN Design and Best Practices252Network Requirements for Applications252Best Practices for Hierarchical Layers253Access Layer Best Practices253Distribution Layer Best Practices257Core Layer Best Practices258Campus Layer Best Practices258VTP Considerations260High Availability Network Services260Redundancy Models260First-Hop Redundancy for LAN High Availability261Server Redundancy264Route Redundancy264Link Media Redundancy266Redundancy Models Summary267Large-Building LANs267Enterprise Campus LANs268Small and Medium Campus Design Options270Campus LAN QoS Considerations270References and Recommended Readings272Exam Preparation Tasks272Review All Key Topics272Complete Tables and Lists from Memory272Define Key Terms272Q&A273

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Chapter 8WAN for the Enterprise280“Do I Know This Already?” Quiz280Foundation Topics282WAN Overview282WAN Defined282WAN Edge Module284Enterprise Edge Modules284WAN Transport Technologies285Layer 2 VPN286MPLS Layer 3 VPN286Metro Ethernet287SONET/SDH287Dense Wavelength-Division Multiplexing289Dark Fiber289Wireless: 4G/5G289SD-WAN Customer Edge291WAN Link Categories292Ordering WAN Technology293WAN Connectivity Options Summary293Site-to-Site VPN Design294VPN Benefits294IPsec296IPsec Direct Encapsulation296DMVPN297Service Provider VPNs: Layer 2 Versus Layer 3298Virtual Private Wire Services299VPWS Layer 2 VPN Considerations299Virtual Private LAN Service299VPLS Layer 2 VPN Considerations300MPLS Layer 3 VPNs300MPLS Layer 3 Design Overview300MPLS Layer 3 VPN Considerations301Generic Routing Encapsulation301GETVPN301Cloud-Based Services301References and Recommended Readings302Exam Preparation Tasks303Contentsxxiii

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xxivCCNPEnterpriseDesignENSLD300-420OfficialCertGuideReview All Key Topics303Complete Tables and Lists from Memory303Define Key Terms304Q&A304Chapter 9WAN Availability and QoS310“Do I Know This Already?” Quiz310Foundation Topics312WAN Design Methodologies312Response Time314Throughput314Reliability314Bandwidth Considerations314Design for High Availability315Defining Availability315Deployment Models316Redundancy Options316Single-Homed Versus Multi-Homed WANs317Single-Homed MPLS WANs317Multi-Homed MPLS WANs318Hybrid WANs: Layer 3 VPN with Internet Tunnels318Internet Connectivity319Internet for Remote Sites320High Availability for the Internet Edge321Backup Connectivity321Failover322QoS Strategies322Best-Effort QoS323DiffServ323IntServ324Designing End-to-End QoS Policies324Classification and Marking324Shaping324Policing325Queuing325Congestion Management325Priority Queuing326Custom Queuing326

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Weighted Fair Queuing326Class-Based Weighted Fair Queuing326Low-Latency Queuing326Link Efficiency327Window Size327References and Recommended Readings327Exam Preparation Tasks328Review All Key Topics328Complete Tables and Lists from Memory328Define Key Terms329Q&A329Chapter 10SD-Access Design334“Do I Know This Already?” Quiz334Foundation Topics336SD-Access Architecture336SD-Access Fabric337Underlay337Overlay338Control Plane339Data Plane340Automation340Wireless341Security and ISE343SD-Access Fabric Design Considerations for Wired and Wireless Access344Overlay Design344Fabric Design345Control Plane Design345Border Design346Segmentation346Virtual Networks347Scalability348Very Small Site Design Considerations349Small Site Design Considerations349Medium Site Design Considerations350Large Site Design Considerations350Over-the-Top351Fabric Wireless351Multicast352Contents xxv

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xxviCCNPEnterpriseDesignENSLD300-420OfficialCertGuideReferences and Recommended Readings352Exam Preparation Tasks353Review All Key Topics353Complete Tables and Lists from Memory354Define Key Terms354Q&A354Chapter 11SD-WAN Design360“Do I Know This Already?” Quiz360Foundation Topics361SD-WAN Architecture362Orchestration Plane363Management Plane363Control Plane364Data Plane364vEdge Color Attributes364Overlay Management Protocol364Onboarding and Provisioning366Zero Touch Provisioning (ZTP)366Onboarding a vEdge Router via Manual Configuration367Onboarding Cisco IOS XE SD-WAN Routers367SD-WAN Security367SD-WAN Design Considerations368Control Plane Design368Scalability369High Availability and Redundancy369Site Redundancy370Transport Redundancy370Network/Headend Redundancy370Controller Redundancy371LAN Design371vEdge DHCP Server373Direct Internet Access (DIA)373Security Design373VPN Segmentation373VPN Topology Design374Access Control Lists (ACLs)375

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SD-WAN Migration Strategy375QoS in SD-WAN376Bidirectional Forwarding Detection (BFD)376Policies376Application-Aware Routing377vEdge Interface Queues377Multicast over SD-WAN378Cisco SD-WAN Cloud OnRamp379Benefits of Cisco SD-WAN Cloud OnRamp379Cisco SD-WAN Cloud OnRamp Solutions379References and Recommended Readings380Exam Preparation Tasks381Review All Key Topics381Complete Tables and Lists from Memory382Define Key Terms382Q&A382Chapter 12Automation390“Do I Know This Already?” Quiz390Foundation Topics392Introduction to Network APIs and Protocols392Network APIs and Protocol Concepts393Evolution of Programmability393Data Encoding Formats394JSON394XML395Data Models395Model-Driven Programmability Stack395REST396YANG, NETCONF, and RESTCONF Explored397YANG Concepts397NETCONF Concepts399RESTCONF Concepts401NETCONF and RESTCONF Compared402IETF, OpenConfig, and Cisco YANG Models403IETF403OpenConfig404Cisco YANG Models404Contentsxxvii

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xxviiiCCNPEnterpriseDesignENSLD300-420OfficialCertGuideModel-Driven Telemetry404Streaming Telemetry Data404Model-Driven Telemetry Concepts405Subscription Explained406Periodic Publication406On-Change Publication407Defining GRPC and GNMI407Dial-In Approaches408Dial-Out Approaches408References and Recommended Readings409Exam Preparation Tasks409Review All Key Topics410Complete Tables and Lists from Memory410Define Key Terms411Q&A411Chapter 13Final Preparation416Getting Ready416Tools for Final Preparation417Pearson Cert Practice Test Engine and Questions on the Website417Accessing the Pearson Test Prep Software Online417Accessing the Pearson Test Prep Software Offline418Customizing Your Exams418Updating Your Exams419Premium Edition420Chapter-Ending Review Tools420Suggested Plan for Final Review/Study420Summary420Chapter 14CCNP Enterprise Design ENSLD 300-420 Official Cert GuideExam Updates422The Purpose of This Chapter422About Possible Exam Updates422Impact on You and Your Study Plan423News About the Next Exam Release424Updated Technical Content424

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Appendix AAnswers to the “Do I Know This Already?” Quiz QuestionsQ&A Questions426Appendix BOSI Model, TCP/IP Architecture, and Numeric Conversion452Glossary466Index476Online ElementsAppendix CMemory TablesAppendix DMemory Tables Answer KeyAppendix EStudy PlannerGlossaryContentsxxix

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