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

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    CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Second Edition Companion Website and Pearson Test Prep Access Code Access 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 the print book ISBN : 9780138247263. 3. Answer the security question to validate your purchase. 4. Go to your account page. 5. Click on the Registered Products tab. 6. Under the book listing, click on the Access Bonus Content link. 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 this code to access the practice test that comes with this book. You can redeem the code at PearsonTestPrep.com . Simply choose Pearson IT Certification as your product group and log into the site with the same credentials you used to register your book. Click the Activate New Product button and enter the access code. More detailed instructions on how to redeem your access 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 Prep practice test access code, you can contact our support team by going to pearsonitp.echelp.org .

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    Cisco Press CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Second Edition ANTHONY BRUNO, CCIE NO. 2738 STEVE JORDAN, CCIE NO. 11293

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    iv CCNP Enterprise Design ENSLD 300-420 Official Cert Guide CCNP Enterprise Design ENSLD 300-420 Official Cert Guide, Second Edition Anthony Bruno Steve Jordan Copyright© 2024 Pearson Education, Inc. Published by: Cisco Press Hoboken, New Jersey All 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 retrieval system, without written permission from the publisher, except for the inclusion of brief quotations in a review. $PrintCode Library of Congress Control Number: 2023949622 ISBN-13: 978-0-13-824726-3 ISBN-10: 0-13-824726-9 Warning and Disclaimer This 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 or fitness is implied. The information is provided on an “as is” basis. The authors, Cisco Press, and Cisco Systems, Inc. shall have neither liability nor responsibility to any person or entity with respect to any loss or damages arising from the 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 Cisco Systems, Inc. Trademark Acknowledgments All terms mentioned in this book that are known to be trademarks or service marks have been appropriately capitalized. Cisco Press or Cisco Systems, Inc., cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark. Special Sales For information about buying this title in bulk quantities, or for special sales opportunities (which may include electronic versions; custom cover designs; and content particular to your business, training goals, marketing focus, or branding interests), please contact our corporate sales department at corpsales@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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    v Feedback Information At Cisco Press, our goal is to create in-depth technical books of the highest quality and value. Each book is crafted with care and precision, undergoing rigorous development that involves the unique expertise of members from the professional technical community. Readers' feedback is a natural continuation of this process. If you have any comments regarding how we could improve the quality of this book, or otherwise alter it to better suit your needs, you can contact us through email at feedback@ciscopress.com. Please make sure to include the book title and ISBN in your message. We greatly appreciate your assistance. Vice President, IT Professional : Mark Taub Alliance Manager: Caroline Antonio Director, ITP Product Management : Brett Bartow Executive Editor : Nancy Davis Managing Editor : Sandra Schroeder Development Editor : Ellie Bru Senior Project Editor : Tonya Simpson Copy Editor : Chuck Hutchinson Technical Editor : Kevin Yudong Wu Editorial Assistant : Cindy Teeters Cover Designer : Chuti Prasertsith Composition : codeMantra Indexer : Charlotte Kughen Proofreader : Timothy Wright

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    vi CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Pearson’s Commitment to Diversity, Equity, and Inclusion Pearson is dedicated to creating bias-free content that reflects the diversity of all learners. We embrace 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 to deliver opportunities that improve lives and enable economic mobility. As we work with authors to create content for every product and service, we acknowledge our responsibil- ity to demonstrate inclusivity and incorporate diverse scholarship so that everyone can achieve their potential through learning. As the world’s leading learning company, we have a duty to help drive change and live up to our purpose to help more people create a better 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 diversity of learners. ■ ■ Our educational content accurately reflects the histories and experiences of the learners we serve. ■ ■ Our educational content prompts deeper discussions with learners and motivates them to expand their own learning (and worldview). While we work hard to present unbiased content, we want to hear from you about any concerns 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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    vii About the Authors Anthony Bruno, CCIE No. 2738, is an enterprise architect with British Telecom (BT) with more than 30 years of experience in the internetworking field. Previously, he worked for International Network Services (INS) and Lucent Technologies, and he was a captain in the U.S. Air Force. He has consulted for many enterprise and service provider customers in the design, implementation, and optimization of large-scale networks. Anthony leads architecture and design teams in building next-generation networks for customers. Anthony completed a master of science degree in electrical engineering at the University of 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 coauthored CCNP Enterprise Design ENSLD 300-420 Official Cert Guide: Designing Cisco Enterprise Networks and five editions of the CCDA Official Cert Guide for Cisco Press. Outside work, Anthony enjoys running marathons and Spartan obstacle races, and he has finished eight Ironman distance triathlons. He is also an avid genealogist and ancestry tree researcher. As an FAA certified remote pilot, Anthony also enjoys piloting his drone at home and when traveling. Steve Jordan, CCIE No. 11293, is a principal architect with J. Network Architects and has 26 years of experience in the field of internetworking. For the last 16 years, Steve has specialized 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 and architecture roles, along with working at several Cisco Gold Partners. He has extensive experience in data center and security architecture design and has implemented solutions in many energy, financial, gaming, healthcare, hospitality, and telecommunications indus- tries. Steve is a 20-Year triple CCIE in the tracks of Enterprise Infrastructure, Storage Networking, 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 be found traveling to new places, enjoying sporting events, attending concerts, and trading stocks. For the past 17 years, Steve has also coauthored CCNP Enterprise Design ENSLD 300-420 Official Cert Guide: Designing Cisco Enterprise Networks and three editions of the CCDA Official Cert Guide .

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    viii CCNP Enterprise Design ENSLD 300-420 Official Cert Guide About the Technical Reviewer Kevin Yudong Wu, CCIE No. 10697 (Routing & Switching and Security), is a principal architect 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. Before joining AT&T, Kevin worked as a senior consultant at British Telecom (BT) and customer support engineer at Cisco High Touch Technical Support (HTTS), where he supported both Cisco LAN switching and security products. He holds master’s degrees in both computer science (University of Texas at Arlington, 2003) and materials engineering (Beijing University of Aeronautics and Astronautics, 1995).

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    ix Dedications Anthony Bruno: This book is dedicated to my wife of 32 years, Yvonne Bruno, Ph.D. Thank you for all your support during the development of this book. Steve Jordan: This book is dedicated to my love, Jelilian Jinang, for always supporting me during the development of this book. I also want to dedicate this book to my mother, Frances Brennan, and my dad, Steve Miller, for supporting me and providing encouragement during the writing of this book.

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    x CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Acknowledgments This 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 her expert 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 this book. And a special thanks to the technical reviewer, Kevin Wu; your technical review, comments, and attention to detail made this book accurate. —Anthony Bruno This book would not have been possible without all the great people who have assisted me. I would first like to thank Anthony Bruno for inviting me to assist him in this endeavor once more. Thanks to Brett Bartow, Nancy Davis, and Tonya Simpson, for their 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 wisdom and helped with keeping the book accurate. Finally, thanks to all the managers and marketing people at Cisco Press who make all these books possible. —Steve Jordan

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    xi Contents at a Glance Introduction xxxi Chapter 1 Internet Protocol Version 4 (IPv4) Design 2 Chapter 2 Internet Protocol Version 6 (IPv6) Design 44 Chapter 3 Routing Protocol Characteristics, EIGRP, and IS-IS 90 Chapter 4 OSPF, BGP, and Route Manipulation 132 Chapter 5 IP Multicast and Network Management 180 Chapter 6 Enterprise LAN Design and Technologies 214 Chapter 7 Advanced Enterprise Campus Design 250 Chapter 8 WAN for the Enterprise 280 Chapter 9 WAN Availability and QoS 310 Chapter 10 SD-Access Design 334 Chapter 11 SD-WAN Design 360 Chapter 12 Automation 390 Chapter 13 Final Preparation 416 Chapter 14 CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Exam Updates 422 Appendix A Answers to the “Do I Know This Already?” Quiz Questions and Q&A Questions 426 Appendix B OSI Model, TCP/IP Architecture, and Numeric Conversion 452 Glossary 466 Index 476 Online Elements: Appendix C Memory Tables Appendix D Memory Tables Answer Key Appendix E Study Planner Glossary

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    xii CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Reader Services Register your copy at www.ciscopress.com/title/9780138247263 for convenient access to downloads, updates, and corrections as they become available. To start the registration process, go to www.ciscopress.com/register and log in or create an account.* Enter the product ISBN 9780138247263 and click Submit . When the process is complete, you will find any available bonus content under Registered Products. *Be sure to check the box saying that you would like to hear from us to receive exclusive discounts on future editions of this product.

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    xiii Contents Introduction xxxi Chapter 1 Internet Protocol Version 4 (IPv4) Design 2 “Do I Know This Already?” Quiz 2 Foundation Topics 4 IPv4 Header 5 ToS 7 IPv4 Fragmentation 10 IPv4 Addressing 11 IPv4 Address Classes 12 Class A Addresses 12 Class B Addresses 13 Class C Addresses 13 Class D Addresses 13 Class E Addresses 13 IPv4 Address Types 13 IPv4 Private Addresses 14 NAT 14 IPv4 Address Subnets 17 Mask Nomenclature 17 IP Address Subnet Design Example 18 Determining the Network Portion of an IP Address 19 Variable-Length Subnet Masking 19 VLSM Address Assignment: Example 1 20 Loopback Addresses 21 IP Telephony Networks 22 VLSM Address Assignment: Example 2 22 IPv4 Addressing Design 24 Goals of IPv4 Address Design 24 Planning for Future Use of IPv4 Addresses 24 Performing Route Summarization 24 Planning for a Hierarchical IP Address Network 25 Private and Public IP Address and NAT Guidelines 26 Steps for Creating an IPv4 Address Plan 27 Case Study: IP Address Subnet Allocation 28 Address Assignment and Name Resolution 29 Recommended Practices of IP Address Assignment 30

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    xiv CCNP Enterprise Design ENSLD 300-420 Official Cert Guide BOOTP 30 DHCP 30 DNS 32 ARP 34 References and Recommended Readings 35 Exam Preparation Tasks 37 Review All Key Topics 37 Complete Tables and Lists from Memory 37 Define Key Terms 37 Q&A 38 Chapter 2 Internet Protocol Version 6 (IPv6) Design 44 “Do I Know This Already?” Quiz 44 Foundation Topics 47 Introduction to IPv6 47 IPv6 Header 48 IPv6 Address Representation 50 IPv4-Mapped IPv6 Addresses 51 IPv6 Prefix Representation 51 IPv6 Address Scope Types and Address Allocations 52 IPv6 Address Allocations 52 IPv6 Unicast Addresses 53 Global Unicast Addresses 53 Link-Local Addresses 54 Unique Local IPv6 Address 54 Global Aggregatable IPv6 Address 55 IPv4-Compatible IPv6 Addresses 55 IPv4-Mapped IPv6 Addresses 55 IPv6 Anycast Addresses 55 IPv6 Multicast Addresses 56 IPv6 Mechanisms 58 ICMPv6 58 IPv6 Neighbor Discovery Protocol 59 IPv6 Name Resolution 60 Path MTU Discovery 61 IPv6 Address-Assignment Strategies 61 Manual Configuration 61 SLAAC of Link-Local Address 61

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    Contents xv SLAAC of Globally Unique IPv6 Address 62 DHCPv6 63 DHCPv6 Lite 63 IPv6 Security 63 IPv6 Routing Protocols 64 RIPng 64 EIGRP for IPv6 64 OSPFv3 64 IS-IS for IPv6 64 BGP4 Multiprotocol Extensions (MP-BGP) for IPv6 65 IPv6 Addressing Design 65 Planning for Addressing with IPv6 65 Route Summarization with IPv6 65 IPv6 Private Addressing 66 IPv6 for the Enterprise 66 IPv6 Address Allocation 66 Partly Linked IPv4 Address into IPv6 67 Whole IPv4 Address Linked to IPv6 67 IPv6 Addresses Allocated per Location and/or Type 67 IPv4-to-IPv6 Migration Strategies and Deployment Models 68 Dual-Stack Migration Strategy 68 IPv6 over IPv4 Tunneling Strategy 69 Manual Configured Tunnels and GRE Tunnels 69 Automatic Tunnel Mechanisms 69 6to4 Tunnels 69 6RD Tunnels 70 IPv6 ISATAP Tunnels 70 IPv6/IPv4 Translation Strategy 71 DNS64 71 NAT64 71 Stateless NAT64 71 Stateful NAT64 71 IPv6 Deployment Models 73 Dual-Stack Model 73 Hybrid Model 74 Service Block Model 75 IPv6 Deployment Model Comparison 76 IPv6 Comparison with IPv4 76

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    xvi CCNP Enterprise Design ENSLD 300-420 Official Cert Guide References and Recommended Readings 77 Exam Preparation Tasks 80 Review All Key Topics 80 Complete Tables and Lists from Memory 80 Define Key Terms 81 Q&A 81 Chapter 3 Routing Protocol Characteristics, EIGRP, and IS-IS 90 “Do I Know This Already?” Quiz 90 Foundation Topics 92 Routing Protocol Characteristics 92 Static Versus Dynamic Route Assignment 93 Interior Versus Exterior Routing Protocols 94 Distance-Vector Routing Protocols 95 EIGRP 96 Link-State Routing Protocols 96 Distance-Vector Routing Protocols Versus Link-State Protocols 96 Hierarchical Versus Flat Routing Protocols 97 Classless Versus Classful Routing Protocols 97 IPv4 Versus IPv6 Routing Protocols 98 Administrative Distance 99 Routing Protocol Metrics and Loop Prevention 100 Hop Count 100 Bandwidth 101 Cost 101 Load 102 Delay 103 Reliability 103 Maximum Transmission Unit 103 Routing Loop-Prevention Schemes 104 Split Horizon 104 Poison Reverse 104 Counting to Infinity 105 Triggered Updates 105 Summarization 105 EIGRP 105 EIGRP Components 106 Protocol-Dependent Modules 106

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    Neighbor Discovery and Recovery 106 RTP 107 DUAL 107 EIGRP Timers 109 EIGRP Metrics 109 EIGRP Packet Types 110 EIGRP Design 111 EIGRP Scaling Techniques 111 EIGRP Stub Routers 112 EIGRP Variance Command 113 EIGRP for IPv4 Summary 113 EIGRP for IPv6 (EIGRPv6) Networks 114 EIGRP for IPv6 Design 114 EIGRP in the Data Center 115 EIGRP for IPv6 Summary 115 IS-IS 116 IS-IS Metrics 116 IS-IS Operation and Design 117 IS-IS NET Addressing 117 IS-IS DRs 117 IS-IS Interface Types 117 IS-IS Area Design 118 IS-IS Authentication 119 IS-IS for IPv6 120 IS-IS Summary 121 References and Recommended Readings 121 Exam Preparation Tasks 122 Review All Key Topics 122 Complete Tables and Lists from Memory 123 Define Key Terms 123 Q&A 123 Chapter 4 OSPF, BGP, and Route Manipulation 132 “Do I Know This Already?” Quiz 132 Foundation Topics 134 OSPFv2 134 OSPFv2 Metric 135 OSPFv2 Adjacencies and Hello Timers 135 Contents xvii

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    xviii CCNP Enterprise Design ENSLD 300-420 Official Cert Guide OSPF Message Types 136 OSPFv2 Areas 137 OSPF Area Design Considerations 137 OSPF Router Types 138 OSPF DRs 140 LSA Types 140 Autonomous System External Path Types 141 OSPF Stub Area Types 142 Stub Areas 142 Totally Stubby Areas 142 NSSAs 143 Virtual Links 143 OSPFv2 Router Authentication 143 OSPFv2 Summary 144 OSPFv3 144 OSPFv3 Changes from OSPFv2 145 OSPFv3 Areas and Router Types 145 OSPFv3 LSAs 146 OSPFv3 Summary 148 BGP 148 BGP Neighbors 149 eBGP 149 iBGP 150 Route Reflectors 151 Confederations 152 BGP Administrative Distance 154 BGP Attributes, Weight, and the BGP Decision Process 154 BGP Path Attributes 154 Next-Hop Attribute 154 Local Preference Attribute 154 Origin Attribute 155 Autonomous System Path (AS_Path) Attribute 155 MED Attribute 156 Community Attribute 157 Atomic Aggregate and Aggregator Attributes 157 Weight Attribute 157 BGP Decision Process 158

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    BGP Route Manipulation and Load Balancing 160 eBGP Multihop 161 BGP Multipath 161 BGP Summary 161 Route Manipulation 161 PBR 162 Route Summarization 162 Route Redistribution 164 Default Metric 167 OSPF Redistribution 167 Route Filtering 167 Transit Traffic 168 Bidirectional Forwarding Detection (BFD) 168 Graceful Restart and Non-Stop Routing 169 Virtual Routing and Forwarding (VRF) 169 References and Recommended Readings 169 Exam Preparation Tasks 170 Review All Key Topics 170 Complete Tables and Lists from Memory 171 Define Key Terms 171 Q&A 171 Chapter 5 IP Multicast and Network Management 180 “Do I Know This Already?” Quiz 180 Foundation Topics 182 IP Multicast Review 182 Multicast Addresses 182 Layer 3 to Layer 2 Mapping 183 IGMP 184 IGMPv1 184 IGMPv2 184 IGMPv3 185 CGMP 185 IGMP Snooping 186 Sparse Versus Dense Multicast 186 Multicast Source and Shared Trees 187 PIM 187 PIM-SM 187 Contents xix

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    xx CCNP Enterprise Design ENSLD 300-420 Official Cert Guide PIM DR 188 Auto-RP 188 BIDIR-PIM 188 PIM-SSM 189 MSDP 189 Summary of Multicast Protocols 189 IPv6 Multicast Addresses 190 Network Management Design 190 SNMP 191 SNMP Components 191 Network Management Design Considerations 192 In-Band Versus Out-of-Band Network Management 192 Network Management Traffic Prioritization 192 MIB 192 SNMP Versions 194 SNMPv1 194 SNMPv2 194 SNMPv3 195 Other Network Management Technologies 196 RMON 196 RMON2 197 NetFlow 197 NetFlow Compared to RMON and SNMP 200 CDP 201 LLDP 202 Syslog 202 References and Recommended Readings 203 Exam Preparation Tasks 205 Review All Key Topics 205 Complete Tables and Lists from Memory 205 Define Key Terms 206 Q&A 206 Chapter 6 Enterprise LAN Design and Technologies 214 “Do I Know This Already?” Quiz 214 Foundation Topics 216 Hierarchical Network Models 216 Benefits of the Hierarchical Model 216

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    Hierarchical Network Design 217 Core Layer 218 Distribution Layer 218 Access Layer 219 Hierarchical Model Examples 221 VSS 222 Hub-and-Spoke Design 222 Collapsed Core Design 223 Building Triangles and Redundant Links 224 Local Versus End-to-End VLAN Design Models 225 LAN Media 225 Ethernet Design Rules 226 100 Mbps Fast Ethernet Design Rules 226 Gigabit Ethernet Design Rules 227 1000BASE-LX Long-Wavelength Gigabit Ethernet 228 1000BASE-SX Short-Wavelength Gigabit Ethernet 228 1000BASE-CX Gigabit Ethernet over Coaxial Cable 228 1000BASE-T Gigabit Ethernet over UTP 228 10 Gigabit Ethernet Design Rules 229 10 Gigabit Ethernet Media Types 229 EtherChannel 230 Port Aggregation Considerations 231 Comparison of Campus Media 231 Power over Ethernet (PoE) 232 Spanning Tree Protocol and Layer 2 Security Design Considerations 232 Spanning Tree Protocol Metrics 233 PVST+ 234 Rapid PVST+ 234 Alignment of Spanning Tree Protocol with FHRP 234 MST 234 Cisco Spanning Tree Protocol Toolkit 235 PortFast 235 UplinkFast 235 BackboneFast 235 Loop Guard 236 Root Guard 236 BPDU Guard 236 Contents xxi

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    xxii CCNP Enterprise Design ENSLD 300-420 Official Cert Guide BPDU Filter 236 Unidirectional Link Detection (UDLD) Protocol 237 Layer 2 Security 238 References and Recommended Readings 239 Exam Preparation Tasks 240 Review All Key Topics 240 Complete Tables and Lists from Memory 240 Define Key Terms 240 Q&A 240 Chapter 7 Advanced Enterprise Campus Design 250 “Do I Know This Already?” Quiz 250 Foundation Topics 251 Campus LAN Design and Best Practices 252 Network Requirements for Applications 252 Best Practices for Hierarchical Layers 253 Access Layer Best Practices 253 Distribution Layer Best Practices 257 Core Layer Best Practices 258 Campus Layer Best Practices 258 VTP Considerations 260 High Availability Network Services 260 Redundancy Models 260 First-Hop Redundancy for LAN High Availability 261 Server Redundancy 264 Route Redundancy 264 Link Media Redundancy 266 Redundancy Models Summary 267 Large-Building LANs 267 Enterprise Campus LANs 268 Small and Medium Campus Design Options 270 Campus LAN QoS Considerations 270 References and Recommended Readings 272 Exam Preparation Tasks 272 Review All Key Topics 272 Complete Tables and Lists from Memory 272 Define Key Terms 272 Q&A 273

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    Chapter 8 WAN for the Enterprise 280 “Do I Know This Already?” Quiz 280 Foundation Topics 282 WAN Overview 282 WAN Defined 282 WAN Edge Module 284 Enterprise Edge Modules 284 WAN Transport Technologies 285 Layer 2 VPN 286 MPLS Layer 3 VPN 286 Metro Ethernet 287 SONET/SDH 287 Dense Wavelength-Division Multiplexing 289 Dark Fiber 289 Wireless: 4G/5G 289 SD-WAN Customer Edge 291 WAN Link Categories 292 Ordering WAN Technology 293 WAN Connectivity Options Summary 293 Site-to-Site VPN Design 294 VPN Benefits 294 IPsec 296 IPsec Direct Encapsulation 296 DMVPN 297 Service Provider VPNs: Layer 2 Versus Layer 3 298 Virtual Private Wire Services 299 VPWS Layer 2 VPN Considerations 299 Virtual Private LAN Service 299 VPLS Layer 2 VPN Considerations 300 MPLS Layer 3 VPNs 300 MPLS Layer 3 Design Overview 300 MPLS Layer 3 VPN Considerations 301 Generic Routing Encapsulation 301 GETVPN 301 Cloud-Based Services 301 References and Recommended Readings 302 Exam Preparation Tasks 303 Contents xxiii

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    xxiv CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Review All Key Topics 303 Complete Tables and Lists from Memory 303 Define Key Terms 304 Q&A 304 Chapter 9 WAN Availability and QoS 310 “Do I Know This Already?” Quiz 310 Foundation Topics 312 WAN Design Methodologies 312 Response Time 314 Throughput 314 Reliability 314 Bandwidth Considerations 314 Design for High Availability 315 Defining Availability 315 Deployment Models 316 Redundancy Options 316 Single-Homed Versus Multi-Homed WANs 317 Single-Homed MPLS WANs 317 Multi-Homed MPLS WANs 318 Hybrid WANs: Layer 3 VPN with Internet Tunnels 318 Internet Connectivity 319 Internet for Remote Sites 320 High Availability for the Internet Edge 321 Backup Connectivity 321 Failover 322 QoS Strategies 322 Best-Effort QoS 323 DiffServ 323 IntServ 324 Designing End-to-End QoS Policies 324 Classification and Marking 324 Shaping 324 Policing 325 Queuing 325 Congestion Management 325 Priority Queuing 326 Custom Queuing 326

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    Weighted Fair Queuing 326 Class-Based Weighted Fair Queuing 326 Low-Latency Queuing 326 Link Efficiency 327 Window Size 327 References and Recommended Readings 327 Exam Preparation Tasks 328 Review All Key Topics 328 Complete Tables and Lists from Memory 328 Define Key Terms 329 Q&A 329 Chapter 10 SD-Access Design 334 “Do I Know This Already?” Quiz 334 Foundation Topics 336 SD-Access Architecture 336 SD-Access Fabric 337 Underlay 337 Overlay 338 Control Plane 339 Data Plane 340 Automation 340 Wireless 341 Security and ISE 343 SD-Access Fabric Design Considerations for Wired and Wireless Access 344 Overlay Design 344 Fabric Design 345 Control Plane Design 345 Border Design 346 Segmentation 346 Virtual Networks 347 Scalability 348 Very Small Site Design Considerations 349 Small Site Design Considerations 349 Medium Site Design Considerations 350 Large Site Design Considerations 350 Over-the-Top 351 Fabric Wireless 351 Multicast 352 Contents xxv

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    xxvi CCNP Enterprise Design ENSLD 300-420 Official Cert Guide References and Recommended Readings 352 Exam Preparation Tasks 353 Review All Key Topics 353 Complete Tables and Lists from Memory 354 Define Key Terms 354 Q&A 354 Chapter 11 SD-WAN Design 360 “Do I Know This Already?” Quiz 360 Foundation Topics 361 SD-WAN Architecture 362 Orchestration Plane 363 Management Plane 363 Control Plane 364 Data Plane 364 vEdge Color Attributes 364 Overlay Management Protocol 364 Onboarding and Provisioning 366 Zero Touch Provisioning (ZTP) 366 Onboarding a vEdge Router via Manual Configuration 367 Onboarding Cisco IOS XE SD-WAN Routers 367 SD-WAN Security 367 SD-WAN Design Considerations 368 Control Plane Design 368 Scalability 369 High Availability and Redundancy 369 Site Redundancy 370 Transport Redundancy 370 Network/Headend Redundancy 370 Controller Redundancy 371 LAN Design 371 vEdge DHCP Server 373 Direct Internet Access (DIA) 373 Security Design 373 VPN Segmentation 373 VPN Topology Design 374 Access Control Lists (ACLs) 375

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    SD-WAN Migration Strategy 375 QoS in SD-WAN 376 Bidirectional Forwarding Detection (BFD) 376 Policies 376 Application-Aware Routing 377 vEdge Interface Queues 377 Multicast over SD-WAN 378 Cisco SD-WAN Cloud OnRamp 379 Benefits of Cisco SD-WAN Cloud OnRamp 379 Cisco SD-WAN Cloud OnRamp Solutions 379 References and Recommended Readings 380 Exam Preparation Tasks 381 Review All Key Topics 381 Complete Tables and Lists from Memory 382 Define Key Terms 382 Q&A 382 Chapter 12 Automation 390 “Do I Know This Already?” Quiz 390 Foundation Topics 392 Introduction to Network APIs and Protocols 392 Network APIs and Protocol Concepts 393 Evolution of Programmability 393 Data Encoding Formats 394 JSON 394 XML 395 Data Models 395 Model-Driven Programmability Stack 395 REST 396 YANG, NETCONF, and RESTCONF Explored 397 YANG Concepts 397 NETCONF Concepts 399 RESTCONF Concepts 401 NETCONF and RESTCONF Compared 402 IETF, OpenConfig, and Cisco YANG Models 403 IETF 403 OpenConfig 404 Cisco YANG Models 404 Contents xxvii

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    xxviii CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Model-Driven Telemetry 404 Streaming Telemetry Data 404 Model-Driven Telemetry Concepts 405 Subscription Explained 406 Periodic Publication 406 On-Change Publication 407 Defining GRPC and GNMI 407 Dial-In Approaches 408 Dial-Out Approaches 408 References and Recommended Readings 409 Exam Preparation Tasks 409 Review All Key Topics 410 Complete Tables and Lists from Memory 410 Define Key Terms 411 Q&A 411 Chapter 13 Final Preparation 416 Getting Ready 416 Tools for Final Preparation 417 Pearson Cert Practice Test Engine and Questions on the Website 417 Accessing the Pearson Test Prep Software Online 417 Accessing the Pearson Test Prep Software Offline 418 Customizing Your Exams 418 Updating Your Exams 419 Premium Edition 420 Chapter-Ending Review Tools 420 Suggested Plan for Final Review/Study 420 Summary 420 Chapter 14 CCNP Enterprise Design ENSLD 300-420 Official Cert Guide Exam Updates 422 The Purpose of This Chapter 422 About Possible Exam Updates 422 Impact on You and Your Study Plan 423 News About the Next Exam Release 424 Updated Technical Content 424

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    Appendix A Answers to the “Do I Know This Already?” Quiz Questions Q&A Questions 426 Appendix B OSI Model, TCP/IP Architecture, and Numeric Conversion 452 Glossary 466 Index 476 Online Elements Appendix C Memory Tables Appendix D Memory Tables Answer Key Appendix E Study Planner Glossary Contents xxix

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