Introduction xxxvi Your Study Plan 2 Part I Networking Fundamentals 13 Chapter 1 Introduction to TCP/IP Networking 14 Foundation Topics 15 Perspectives on Networking 15 TCP/IP Networking Model 16     History Leading to TCP/IP 17     Overview of the TCP/IP Networking Model 18     TCP/IP Application Layer 19     TCP/IP Transport Layer 20     TCP/IP Network Layer 22     TCP/IP Link Layer (Data Link Plus Physical) 25     TCP/IP Model and Terminology 26 OSI Networking Model 28     Comparing OSI and TCP/IP 29     Describing Protocols by Referencing the OSI Layers 29     OSI Layers and Their Functions 30     OSI Layering Concepts and Benefits 31     OSI Encapsulation Terminology 31 Chapter Summary 33 Chapter 2 Fundamentals of Ethernet LANs 38 Foundation Topics 39 An Overview of LANs 39     Typical SOHO LANs 39     Typical Enterprise LANs 40     The Variety of Ethernet Physical Layer Standards 41     Consistent Behavior over All Links Using the Ethernet Data Link Layer 41 Building Physical Ethernet Networks with UTP 42     Transmitting Data Using Twisted Pairs 42     Breaking Down a UTP Ethernet Link 43     UTP Cabling Pinouts for 10BASE-T and 100BASE-T 45     UTP Cabling Pinouts for 1000BASE-T 48 Sending Data in Ethernet Networks 48     Ethernet Data-Link Protocols 49     Sending Ethernet Frames with Switches and Hubs 52 Chapter Summary 55 Chapter 3 Fundamentals of WANs 60 Foundation Topics 61 Leased-Line WANs 61     Positioning Leased Lines with LANs and Routers 61     Physical Details of Leased Lines 62     Data-Link Details of Leased Lines 64 Ethernet as a WAN Technology 67     Ethernet WANs that Create a Layer 2 Service 68     How Routers Route IP Packets Using Ethernet Emulation 68 Accessing the Internet 69     The Internet as a Large WAN 69     Internet Access (WAN) Links 71     Digital Subscriber Line 72     Cable Internet 73 Chapter Summary 75 Chapter 4 Fundamentals of IPv4 Addressing and Routing 78 Foundation Topics 79 Overview of Network Layer Functions 79     Network Layer Routing (Forwarding) Logic 79     How Network Layer Routing Uses LANs and WANs 81     IP Addressing and How Addressing Helps IP Routing 82     Routing Protocols 83 IPv4 Addressing 84     Rules for IP Addresses 84     Rules for Grouping IP Addresses 84     IP Subnetting 89 IPv4 Routing 90     IPv4 Host Routing 90     Router Forwarding Decisions and the IP Routing Table 91 IPv4 Routing Protocols 93 Other Network Layer Features 94     Using Names and the Domain Name System 95     The Address Resolution Protocol 96     ICMP Echo and the ping Command 97 Chapter Summary 98 Chapter 5 Fundamentals of TCP/IP Transport and Applications 102 Foundation Topics 103 TCP/IP Layer 4 Protocols: TCP and UDP 103     Transmission Control Protocol 103     User Datagram Protocol 111 TCP/IP Applications 112     Uniform Resource Identifiers 112     Finding the Web Server Using DNS 113     Transferring Files with HTTP 114     How the Receiving Host Identifies the Correct Receiving Application 115 Chapter Summary 117 Part I Review 120 Part II Implementing Basic Ethernet LANs 123 Chapter 6 Using the Command-Line Interface 124 Foundation Topics 125 Accessing the Cisco Catalyst Switch CLI 125     Cisco Catalyst Switches 125     Accessing the Cisco IOS CLI 126     CLI Help Features 132     The debug and show Commands 134 Configuring Cisco IOS Software 134     Configuration Submodes and Contexts 135     Storing Switch Configuration Files 137     Copying and Erasing Configuration Files 139 Chapter Summary 140 Chapter 7 Analyzing Ethernet LAN Switching 146 Foundation Topics 147 LAN Switching Concepts 147     Overview of Switching Logic 147     Forwarding Known Unicast Frames 148     Learning MAC Addresses 151     Flooding Unknown Unicast and Broadcast Frames 151     Avoiding Loops Using Spanning Tree Protocol 152     LAN Switching Summary 153 Verifying and Analyzing Ethernet Switching 154     Demonstrating MAC Learning 154     Switch Interfaces 155     Finding Entries in the MAC Address Table 157     Managing the MAC Address Table (Aging, Clearing) 158     MAC Address Tables with Multiple Switches 159 Chapter Summary 161 Chapter 8 Configuring Basic Switch Management 166 Foundation Topics 167 Securing the Switch CLI 167     Securing User Mode and Privileged Mode with Simple Passwords 167     Securing User Mode Access with Local Usernames and Passwords 171     Securing User Mode Access with External Authentication Servers 173     Securing Remote Access with Secure Shell 174 Enabling IPv4 for Remote Access 177     Host and Switch IP Settings 177     Configuring IPv4 on a Switch 179     Configuring a Switch to Learn Its IP Address with DHCP 180     Verifying IPv4 on a Switch 180 Miscellaneous Settings Useful in Lab 181     History Buffer Commands 181     The logging synchronous, exec-timeout, and no ip domain-lookup Commands 182 Chapter Summary 183 Chapter 9 Configuring Switch Interfaces 188 Foundation Topics 189 Configuring Switch Interfaces 189     Configuring Speed, Duplex, and Description 189     Configuring Multiple Interfaces with the interface range Command 191     Administratively Controlling Interface State with shutdown 191     Removing Configuration with the no Command 193     Autonegotiation 194 Port Security 197     Configuring Port Security 198     Verifying Port Security 200     Port Security Violation Actions 201     Port Security MAC Addresses as Static and Secure but Not Dynamic 202 Chapter Summary 203 Part II Review 210 Part III Ethernet LANs: Design, VLANs, and Troubleshooting 215 Chapter 10 Analyzing Ethernet LAN Designs 216 Foundation Topics 217 Analyzing Collision Domains and Broadcast Domains 217     Ethernet Collision Domains 217     Ethernet Broadcast Domains 220 Analyzing Campus LAN Topologies 223     Two-Tier Campus Design (Collapsed Core) 223     Three-Tier Campus Design (Core) 226     Topology Design Terminology 227 Analyzing LAN Physical Standard Choices 228     Ethernet Standards 229     Choosing the Right Ethernet Standard for Each Link 229     Wireless LANs Combined with Wired Ethernet 231 Chapter Summary 235 Chapter 11 Implementing Ethernet Virtual LANs 240 Foundation Topics 241 Virtual LAN Concepts 241     Creating Multiswitch VLANs Using Trunking 242     Forwarding Data Between VLANs 245 VLAN and VLAN Trunking Configuration and Verification 248     Creating VLANs and Assigning Access VLANs to an Interface 248     VLAN Trunking Protocol 252     VLAN Trunking Configuration 253     Implementing Interfaces Connected to Phones 257 Chapter Summary 262 Chapter 12 Troubleshooting Ethernet LANs 268 Foundation Topics 270 Perspectives on Applying Troubleshooting Methodologies 270     Troubleshooting on the Exams 270     A Deeper Look at Problem Isolation 271     Troubleshooting as Covered in This Book 273 Analyzing Switch Interface Status and Statistics 273     Interface Status Codes and Reasons for Nonworking States 274     Interface Speed and Duplex Issues 275     Common Layer 1 Problems on Working Interfaces 277 Predicting Where Switches Will Forward Frames 279     Predicting the Contents of the MAC Address Table 279     Analyzing the Forwarding Path 281 Analyzing Port Security Operations on an Interface 282     Troubleshooting Shutdown Mode and Err-disabled Recovery 283     Troubleshooting Restrict and Protect Modes 284 Analyzing VLANs and VLAN Trunks 286     Ensuring That the Right Access Interfaces Are in the Right VLANs 287     Access VLANs Not Being Defined 287     Access VLANs Being Disabled 288     Mismatched Trunking Operational States 288 Chapter Summary 290 Part III Review 296 Part IV IP Version 4 Addressing and Subnetting 299 Chapter 13 Perspectives on IPv4 Subnetting 300 Foundation Topics 301 Introduction to Subnetting 301     Subnetting Defined Through a Simple Example 301     Operational View Versus Design View of Subnetting 302 Analyze Subnetting and Addressing Needs 303     Rules About Which Hosts Are in Which Subnet 303     Determining the Number of Subnets 304     Determining the Number of Hosts per Subnet 305     One Size Subnet Fits All–Or Not 306 Make Design Choices 308     Choose a Classful Network 309     Choose the Mask 311 Build a List of All Subnets 315 Plan the Implementation 316     Assigning Subnets to Different Locations 316     Choose Static and Dynamic Ranges per Subnet 318 Chapter Summary 319 Chapter 14 Analyzing Classful IPv4 Networks 322 Foundation Topics 323 Classful Network Concepts 323     IPv4 Network Classes and Related Facts 323     Number of Hosts per Network 326     Deriving the Network ID and Related Numbers 326     Unusual Network IDs and Network Broadcast Addresses 328 Practice with Classful Networks 329     Practice Deriving Key Facts Based on an IP Address 329     Practice Remembering the Details of Address Classes 329 Chapter Summary 331 Chapter 15 Analyzing Subnet Masks 336 Foundation Topics 337 Subnet Mask Conversion 337     Three Mask Formats 337     Converting Between Binary and Prefix Masks 338     Converting Between Binary and DDN Masks 338     Converting Between Prefix and DDN Masks 340     Practice Converting Subnet Masks 341 Identifying Subnet Design Choices Using Masks 341     Masks Divide the Subnet’s Addresses into Two Parts 342     Masks and Class Divide Addresses into Three Parts 343     Classless and Classful Addressing 344     Calculations Based on the IPv4 Address Format 344     Practice Analyzing Subnet Masks 346 Chapter Summary 347 Chapter 16 Analyzing Existing Subnets 352 Foundation Topics 353 Defining a Subnet 353     An Example with Network 172.16.0.0 and Four Subnets 353     Subnet ID Concepts 354     Subnet Broadcast Address 355     Range of Usable Addresses 356 Analyzing Existing Subnets: Binary 356     Finding the Subnet ID: Binary 356     Finding the Subnet Broadcast Address: Binary 358     Binary Practice Problems 359     Shortcut for the Binary Process 360     Brief Note About Boolean Math 361     Finding the Range of Addresses 361 Analyzing Existing Subnets: Decimal 362     Analysis with Easy Masks 362     Predictability in the Interesting Octet 363     Finding the Subnet ID: Difficult Masks 364     Finding the Subnet Broadcast Address: Difficult Masks 366 Practice Analyzing Existing Subnets 368     A Choice: Memorize or Calculate 368 Chapter Summary 369 Part IV Review 374 Part V Implementing IPv4 377 Chapter 17 Operating Cisco Routers 378 Foundation Topics 379 Installing Cisco Routers 379     Installing Enterprise Routers 379     Installing Internet Access Routers 381 Enabling IPv4 Support on Cisco Router Interfaces 383     Accessing the Router CLI 383     Router Interfaces 384     Router Auxiliary Port 390 Chapter Summary 391 Chapter 18 Configuring IPv4 Addresses and Static Routes 396 Foundation Topics 398 IP Routing 398     IPv4 Routing Process Reference 398     An Example of IP Routing 400 Configuring IP Addresses and Connected Routes 404     Connected Routes and the ip address Command 404     The ARP Table on a Cisco Router 406     Routing Between Subnets on VLANs 407 Configuring Static Routes 412     Static Route Configuration 413     Static Host Routes 414     Static Routes with No Competing Routes 415     Static Routes with Competing Routes 415     Static Default Routes 417     Troubleshooting Static Routes 418 Chapter Summary 420 Chapter 19 Learning IPv4 Routes with RIPv2 426 Foundation Topics 427 RIP and Routing Protocol Concepts 427     History of Interior Gateway Protocols 427     Comparing IGPs 427     Distance Vector Basics 429     Summarizing RIPv2 Features 432 Core RIPv2 Configuration and Verification 433     Configuring Core RIPv2 Features 433     RIPv2 Verification 436 Optional RIPv2 Configuration and Verification 440     Controlling RIP Updates with the passive-interface Command 441     Supporting Multiple Equal-Cost Routes with Maximum Paths 441     Understanding Autosummarization and Discontiguous Classful Networks 442     Verifying Optional RIP Features 444     RIPv2 Default Routes 446 Troubleshooting RIPv2 449     Symptoms with Missing and Incorrect network Commands 450     Issues Related to Passive Interfaces 452     Issues Related to auto-summary 452     RIP Issues Caused by Other Router Features 453 Summary of RIP Troubleshooting Issues 453 Chapter Summary 454 Chapter 20 DHCP and IP Networking on Hosts 460 Foundation Topics 461 Implementing and Troubleshooting DHCP 461     DHCP Concepts 461     DHCP Server Configuration on Routers 465     IOS DHCP Server Verification 467     Troubleshooting DHCP Services 468 Verifying Host IPv4 Settings 473     IP Address and Mask Configuration 473     Name Resolution with DNS 475     Default Routers 475 IPv4 Address Types 477     Review of Unicast (Class A, B, and C) IP Addresses 477     IP Broadcast Addresses 478     IPv4 Multicast Addresses (Class D Addresses) 479     Comparing and Contrasting IP Address Types 481 Chapter Summary 482 Part V Review 488 Part VI IPv4 Design and Troubleshooting 493 Chapter 21 Subnet Design 494 Foundation Topics 495 Choosing the Mask(s) to Meet Requirements 495     Review: Choosing the Minimum Number of Subnet and Host Bits 495     No Masks Meet Requirements 496     One Mask Meets Requirements 497     Multiple Masks Meet Requirements 497     The Formal Process 500     Practice Choosing Subnet Masks 500 Finding All Subnet IDs 501     First Subnet ID: The Zero Subnet 501     Finding the Pattern Using the Magic Number 502     A Formal Process with Less Than 8 Subnet Bits 503     Finding All Subnets with Exactly 8 Subnet Bits 506     Finding All Subnets with More Than 8 Subnet Bits 507     Practice Finding All Subnet IDs 509 Chapter Summary 511 Chapter 22 Variable-Length Subnet Masks 518 Foundation Topics 519 VLSM Concepts and Configuration 519     Classless and Classful Routing Protocols 519     VLSM Configuration and Verification 520 Finding VLSM Overlaps 521     Designing Subnetting Plans with VLSM 521     An Example of Finding a VLSM Overlap 523     Practice Finding VLSM Overlaps 524 Adding a New Subnet to an Existing VLSM Design 524     An Example of Adding a New VLSM Subnet 525 Chapter Summary 527 Chapter 23 IPv4 Troubleshooting Tools 532 Foundation Topics 533 Problem Isolation Using the ping Command 533     Ping Command Basics 533     Strategies and Results When Testing with the ping Command 534     Using Ping with Names and with IP Addresses 541 Problem Isolation Using the traceroute Command 542     traceroute Basics 542     Using traceroute to Isolate the Problem to Two Routers 545 Telnet and SSH 547     Common Reasons to Use the IOS Telnet and SSH Client 547     IOS Telnet and SSH Examples 548 Chapter Summary 550 Chapter 24 Troubleshooting IPv4 Routing 552 Foundation Topics 553 Problems Between the Host and the Default Router 553     Root Causes Based on a Host’s IPv4 Settings 553     Root Causes Based on the Default Router’s Configuration 558 Problems with Routing Packets Between Routers 561     IP Forwarding by Matching the Most Specific Route 562     Routing Problems Caused by Incorrect Addressing Plans 565     Pointers to Related Troubleshooting Topics 569 Chapter Summary 571 Part VI Review 574 Part VII IPv4 Services: ACLs and NAT 579 Chapter 25 Basic IPv4 Access Control Lists 580 Foundation Topics 581 IPv4 Access Control List Basics 581     ACL Location and Direction 581     Matching Packets 582     Taking Action When a Match Occurs 583     Types of IP ACLs 583 Standard Numbered IPv4 ACLs 583     List Logic with IP ACLs 584     Matching Logic and Command Syntax 585     Implementing Standard IP ACLs 588     Troubleshooting and Verification Tips 592 Practice Applying Standard IP ACLs 593     Practice Building access-list Commands 593     Reverse Engineering from ACL to Address Range 594 Chapter Summary 596 Chapter 26 Advanced IPv4 Access Control Lists 602 Foundation Topics 603 Extended Numbered IP Access Control Lists 603     Matching the Protocol, Source IP, and Destination IP 603     Matching TCP and UDP Port Numbers 604     Extended IP ACL Configuration 607     Practice Building access-list Commands 610 Named ACLs and ACL Editing 610     Named IP Access Lists 611     Editing ACLs Using Sequence Numbers 612     Numbered ACL Configuration Versus Named ACL Configuration 614     ACL Implementation Considerations 615 Troubleshooting with IPv4 ACLs 616     Analyzing ACL Behavior in a Network 616     ACL Interactions with Router-Generated Packets 621 Chapter Summary 624 Chapter 27 Network Address Translation 630 Foundation Topics 631 Perspectives on IPv4 Address Scalability 631     CIDR 631     Private Addressing 632 Network Address Translation Concepts 633     Static NAT 633     Dynamic NAT 636     Overloading NAT with Port Address Translation 637     NAT Configuration and Troubleshooting 638     Static NAT Configuration 638     Dynamic NAT Configuration 640     Dynamic NAT Verification 642     NAT Overload (PAT) Configuration 644     NAT Troubleshooting 646 Chapter Summary 648 Part VII Review 654 Part VIII IP Version 6 659 Chapter 28 Fundamentals of IP Version 6 660 Foundation Topics 661     Introduction to IPv6 661     IPv6 Addressing Formats and Conventions 666 Chapter Summary 672 Chapter 29 IPv6 Addressing and Subnetting 678 Foundation Topics 679 Global Unicast Addressing Concepts 679     A Brief Review of Public and Private IPv4 Addresses 679     The IPv6 Global Routing Prefix 682     Address Ranges for Global Unicast Addresses 683     IPv6 Subnetting Using Global Unicast Addresses 684     Assigning Addresses to Hosts in a Subnet 688 Unique Local Unicast Addresses 689     Subnetting with Unique Local IPv6 Addresses 689     The Need for Globally Unique Local Addresses 690 Chapter Summary 691 Chapter 30 Implementing IPv6 Addressing on Routers 694 Foundation Topics 695 Implementing Unicast IPv6 Addresses on Routers 695     Static Unicast Address Configuration 696     Dynamic Unicast Address Configuration 702 Special Addresses Used by Routers 703     Link-Local Addresses 703     IPv6 Multicast Addresses 706     Miscellaneous IPv6 Addresses 710     IPv6 Addressing Configuration Summary 710 Chapter Summary 712 Chapter 31 Implementing IPv6 Addressing on Hosts 718 Foundation Topics 719 The Neighbor Discovery Protocol 719     Discovering Routers with NDP RS and RA 719     Discovering Addressing Info for SLAAC with NDP RS and RA 720     Discovering Neighbor Link Addresses with NDP NS and NA 721     Discovering Duplicate Addresses Using NDP NS and NA 722     NDP Summary 723 Dynamic Configuration of Host IPv6 Settings 724     Dynamic Configuration Using Stateful DHCP and NDP 724     Using Stateless Address Auto Configuration 727 Troubleshooting IPv6 Addressing 729     Verifying Host IPv6 Connectivity from Hosts 729     Verifying Host Connectivity from Nearby Routers 731 Chapter Summary 734 Chapter 32 Implementing IPv6 Routing 740 Foundation Topics 741 Connected and Local IPv6 Routes 741     Rules for Connected and Local Routes 741     Example of Connected IPv6 Routes 742     Examples of Local IPv6 Routes 743 Static IPv6 Routes 744     Static Routes Using the Outgoing Interface 744     Static Routes Using Next-Hop IPv6 Address 746     Static Default Routes 748     Static IPv6 Host Routes 749     Floating Static IPv6 Routes 749     Default Routes with SLAAC on Router Interfaces 751     Troubleshooting Static IPv6 Routes 752 Chapter Summary 756 Part VIII Review 760 Part IX Network Device Management 763 Chapter 33 Device Management Protocols 764 Foundation Topics 765 System Message Logging (Syslog) 765     Sending Messages in Real Time to Current Users 765     Storing Log Messages for Later Review 766     Log Message Format 766     Log Message Severity Levels 767     Configuring and Verifying System Logging 768     The debug Command and Log Messages 770 Network Time Protocol (NTP) 771     Setting the Time and Timezone 772     Implementing NTP Clients, Servers, and Client/Server Mode 773     NTP Using a Loopback Interface for Better Availability 775 Analyzing Topology Using CDP and LLDP 776     Examining Information Learned by CDP 776     Configuring and Verifying CDP Itself 779     Implementing Link Layer Discovery Protocol 780 Chapter Summary 782 Chapter 34 Device Security Features 788 Foundation Topics 789 Securing IOS Passwords 789     Encrypting Older IOS Passwords with service password-encryption 789     Encoding the Enable Passwords with Hashes 790     Hiding the Passwords for Local Usernames 794 Cisco Device Hardening 794     Configuring Login Banners 794     Securing Unused Switch Interfaces 796     Controlling Telnet and SSH Access with ACLs 797     Firewalls 797 Chapter Summary 801 Chapter 35 Managing IOS Files 806 Foundation Topics 807 Managing Cisco IOS Images and Upgrades 807     The IOS File System 807     Upgrading IOS Images 808     The Cisco IOS Software Boot Sequence 813 Password Recovery 818     The General Ideas Behind Cisco Password Recovery/Reset 819     A Specific Password Reset Example 820 Managing Configuration Files 821     Copying and Erasing Configuration Files 822     Initial Configuration (Setup Mode) 825 Chapter Summary 827 Chapter 36 IOS License Management 832 Foundation Topics 833 IOS Packaging 833     IOS Images per Model, Series, and per Software Version/Release 833     Original Packaging: One IOS Image per Feature Set Combination 834     New IOS Packaging: One Universal Image with All Feature Sets 834 IOS Software Activation with Universal Images 835     The Future: Cisco ONE Licensing 836 Managing Software Activation with Cisco License Manager 837     Manually Activating Software Using Licenses 838     Example of Manually Activating a License 839     Right-to-Use Licenses 843 Chapter Summary 845 Part IX Review 848 Part X Final Review 851 Chapter 37 Final Review 852 Advice About the Exam Event 852     Learn the Question Types Using the Cisco Certification Exam Tutorial 852     Think About Your Time Budget Versus Number of Questions 853     A Suggested Time-Check Method 854     Miscellaneous Pre-Exam Suggestions 854     Exam-Day Advice 854     Reserve the Hour After the Exam in Case You Fail 855 Exam Review 856     Practice Subnetting and Other Math-Related Skills 856     Take Practice Exams 858     Find Knowledge Gaps Through Question Review 860     Practice Hands-On CLI Skills 862     Assess Whether You Are Ready to Pass (and the Fallacy of Exam Scores) 864     Study Suggestions After Failing to Pass 865     Other Study Tasks 866     Final Thoughts 866 Part XI Appendixes 869 Appendix A Numeric Reference Tables 870 Appendix B CCENT/CCNA ICND1 100-105 Exam Updates 876 Glossary 878 DVD Appendixes Appendix C Answers to the Review Questions Appendix D Practice for Chapter 14: Analyzing Classful IPv4 Networks Appendix E Practice for Chapter 15: Analyzing Subnet Masks Appendix F Practice for Chapter 16: Analyzing Existing Subnets Appendix G Practice for Chapter 21: Subnet Design Appendix H Practice for Chapter 22: Variable-Length Subnet Masks Appendix I Practice for Chapter 25: Basic IPv4 Access Control Lists Appendix J Practice for Chapter 28: Fundamentals of IP Version 6 Appendix K Practice for Chapter 30: Implementing IPv6 Addressing on Routers Appendix L Mind Map Solutions Appendix M Study Planner Appendix N Classless Inter-domain Routing Appendix O Route Summarization Appendix P Implementing Point-to-Point WANs Appendix Q Topics from Previous Editions Appendix R Exam Topics Cross Reference     9781587205972   TOC   5/17/2016  

Straight from Cisco: official complete assessment, review, and practice for the newest CCNA ICND1 exam! Revised edition of the #1 selling CCNA preparation self-study guide Book content is fully updated to align to the new CCENT/CCNA ICND1 exam objectives Books and CDs are packed with features to help candidates master more difficult testing methods on the actual exams Practice tests contain scenario-based questions that closely mimic the difficulty of the actual exam Includes 60 minutes of video covering the complex topic of subnetting In-depth expert explanations of all protocols, commands, and technologies on the ICND1 exam

Part 1: Networking Fundamentals. This part may be the least changed part in either book. Of the 5 chapters, only one chapter changes much, and those changes are pretty small. The content continues to have the same theme: introducing TCP/IP.   Part 2: Ethernet LANs. This part takes the previous edition’s 5 chapters and morphs them into 6 chapters. The re-org is mostly by choice to improve the flow, partly to shorten a few of the longer chapters that would grow due to new content. It also moves out the material about some key features (login security and banners) that move to the new Part 8, because the new content in part 8 is a better place to put that content. Part 2 is now a more focused part on how to build Ethernet LANs, introduces new content, and hopefully improves the clarity of how people first learn Ethernet.   Part 3: IPv4 addressing and subnetting. This part is substantively unchanged versus the previous edition. It adds some small content for the new specific exam topic that mentions multicast IP addressing (Chapter P3 1). (Note that I had already written a chapter on CIDR, speculating that the exam would include it, but since it does not, I have decided to publish the material but as a DVD-only appendix.)   Part 4: Implementing IPv4 Routing: Like parts 1, 2, and 3 mirror parts 1, 2, and 3 of the previous edition (respectively), this new part 4 mirrors the prior edition’s part 4. However, while parts 1 and 3 do not change much, part 4 changes quite a bit. All chapters include some new content. Chapter P4 3 replaces the old OSPF chapter with a new RIP chapter; I will use period editions and the DCICN cert guide for source material. These chapters also include new material for the deeper verbs in the exam topics for static IP routing and DHCP servers.   Part 5: IPv4 Design and Troubleshooting: This part is the first part that makes a noticeable departure from the prior edition (part 5). This part includes two chapters picked up (unchanged) from the prior edition (IP Subnetting Design and VLSM), and then picks up two IPv4 troubleshooting chapters from the prior edition of ICND2. The exam topics make a consistent mention of troubleshooting across the topics in ICND1, so these two chapters help strengthen the troubleshooting treatment throughout the topics in the book.   Part 6: Layer 3 Services: The new exam topics split ACL treatment between ICND1 (standard numbered and named) and ICND2 (extended numbered and named). As a tactic, this book will include a little more than the literal split of ACL topics for ICND1, and then repeat the two Part 6 ACL chapters into the new ICND2 book. ICND2 includes troubleshooting of all ACLs, so it needs some treatment of both standard and extended ACLs anyway. This part also includes the usual NAT chapter, improved for the new exam topics’ specific mention of NAT troubleshooting.   Part 7: IP Version 6: This part mostly copies from the previous edition Part 7 of the same name. Two notable changes occur here for content. First, the ICND1 exam topics no longer includes OSPFv3 (OSPF for IPv6), which was the only IPv6 routing protocol in ICND1. So, former chapter 29 (now Chapter P7 5) removes the OSPF content. The mention of IPv6 static routing in the new exam topics expands, both in small details and with the addition of the troubleshoot verb. As a result, Chapter P7 5 receives most of the re-work. The other 4 chapters in this part are mostly unchanged.   Part 8: Infrastructure Management: This part holds most of the topics that did not exist at all in the previous ICND1 exam topics, along with related picked-up material to make it a cohesive whole. The four chapters contain roughly 1.5 chapters of picked up material, plus 2.5 chapters of new material. The topics include: Chapter P8 1, about Syslog, NTP, CDP, and LLDP; P8 2, about device hardening; P8 3, about config and IOS file management, mostly picked up from ICND2; and P8 4, a heavily-revised version of the former ICND2 chapter about IOS licensing.