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Accessing the WAN, CCNA Exploration Companion Guide (new edition - 9781587133497)

by: Bob Vachon, Rick Grazian

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On-line Price: TBAHardcover & CDpackage, 696

Retail Price: TBA

Publisher: CISCO PRESS,05.05.08

Category: Cisco Level: B/I/A

ISBN: 1587132052
ISBN13: 9781587132056

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The all-new and only authorized textbook for the new Cisco Networking Academy CCNA Exploration Accessing the WAN curriculum


  * A portable reference that supports the topics in the all-new Cisco Networking Academy CCNA Exploration Accessing the WAN curriculum aligning 1:1 with course modules


  * Features improved readability, enhanced topic explanations, real-world examples, and all-new graphical presentations


  * Written and Edited by leading Academy Instructors

Accessing the WAN, CCNA Exploration Companion Guide is the official supplemental textbook for this CCNA Exploration course from the Cisco Networking Academy. Completely revised to match the new curriculum with new examples and explanations, this textbook includes original material developed by the authors, yet it fully aligns with the CCNA Exploration curriculum. Written by experienced instructors who present material using their own voices and some of their own examples, this new edition augments student understanding of course material. The new edition incorporates recently improved features to aid instructors and enhance student comprehension. Chapters align with course modules in both name and number, and chapter objectives are stated as questions to encourage students to think about and find answers as they read chapters. End-of-chapter Check Your Understanding questions and Summaries align with chapter objectives to emphasize key topics, while key terms are listed in each chapter opener in the order of occurrence to alert students to upcoming vocabulary words. In addition, key features include 'How To' quick references for step-by-step tasks; real-world examples and all-new illustrations; concise explanations with a focus on word usage and sentence structure for improved readability; and Packet Tracer activities throughout.



Features and Benefit


The all-new and only authorized textbook for the new Cisco Networking Academy CCNA Exploration Accessing the WAN curriculum


  * A portable reference that supports the topics in the all-new Cisco Networking Academy CCNA Exploration Accessing the WAN curriculum aligning 1:1 with course modules


  * Features improved readability, enhanced topic explanations, real-world examples, and all-new graphical presentations


  * Written and Edited by leading Academy Instructors



Table of Contents


Chapter 1 Introduction to WANs 1

Objectives 1

Key Terms 1

Introducing Wide-Area Networks (WANs) 3


  What Is a WAN? 3


  Why Are WANs Necessary? 5

The Evolving Enterprise 5


  Businesses and Their Networks 5


  Small Office (Single LAN) 6


  Campus (Multiple LANs) 6


  Branch (WAN) 8


  Distributed (Global) 9

The Evolving Network Model 11


  The Hierarchical Design Model 11


  The Enterprise Architecture 13

WAN Technology Concepts 17


  WAN Technology Overview 17


  WAN Physical Layer Concepts 18


  WAN Data Link Layer Concepts 23


  WAN Switching Concepts 26

WAN Connection Options 29


  WAN Link Connection Options 29


  Dedicated Connection Link Options 31


  Circuit-Switched Connection Options 32


  Packet-Switched Connection Options 35

I


  nternet Connection Options 38


  Choosing a WAN Link Connection 44

Summary 48

Labs 49

Check Your Understanding 50

Challenge Questions and Activities 54

Chapter 2 PPP 55

Objectives 55

Key Terms 55

Introducing Serial Communications 56


  How Does Serial Communication Work? 56


  Serial Communication Standards 59


  TDM 61


  Demarcation Point 66


  Data Terminal Equipment and Data Communications Equipment 67


  HDLC Encapsulation 72


  Configuring HDLC Encapsulation 75


  Troubleshooting Serial Interfaces 76

PPP Concepts 83


  Introducing PPP 83


  PPP Layered Architecture 84


  PPP Frame Structure 87


  Establishing a PPP Session 88


  Establishing a Link with LCP 89


  NCP Explained 95


  PPP Configuration Options 97


  PPP Configuration Commands 98


  Verifying a Serial PPP Encapsulation Configuration 101


  Troubleshooting PPP Encapsulation 102


  PPP Authentication Protocols 108


  Password Authentication Protocol 109


  Challenge Handshake Authentication Protocol (CHAP) 110


  PPP Encapsulation and Authentication Process 112


  Configuring PPP with Authentication 115


  Troubleshooting a PPP Configuration with Authentication 118

Summary 120

Labs 120

Check Your Understanding 122

Challenge Questions and Activities 126

Chapter 3 Frame Relay 127

Objectives 127

Key Terms 127

Introduction 128

Basic Frame Relay Concepts 128


  Introducing Frame Relay 128


  Virtual Circuits 134


  Frame Relay Encapsulation 140


  Frame Relay Topologies 141


  Frame Relay Address Mapping 145

Configuring Frame Relay 152


  Enabling Frame Relay Encapsulation 153


  Configuring Static Frame Relay Maps 156

Advanced Frame Relay Concepts 159


  Solving Reachability Issues 159


  Frame Relay Subinterfaces 161


  Paying for Frame Relay 162


  Frame Relay Flow Control 166

Configuring Advanced Frame Relay 168


  Configuring Frame Relay Subinterfaces 168


  Verifying Frame Relay Operation 171


  Troubleshooting Frame Relay Configuration 178

Summary 180

Labs 181

Check Your Understanding 182

Challenge Questions and Activities 188

To Learn More 188

Chapter 4 Network Security 189

Objectives 189

Key Terms 189

Introduction to Network Security 190


  Why Is Network Security Important? 190


  Common Security Threats 199


  Types of Network Attacks 206


  General Mitigation Techniques 219


  The Network Security Wheel 226


  The Enterprise Security Policy 229

Securing Cisco Routers 232


  Router Security Issues 232


  Applying Cisco IOS Security Features to Routers 235

Securing Router Network Services 250


  Vulnerable Router Services and Interfaces 250


  Securing Routing Protocols 256


  Locking Down Your Router with Cisco AutoSecure 263

Using Cisco SDM 264


  Cisco SDM Overview 264


  Configuring Your Router to Support SDM 265


  Starting SDM 267


  The SDM Interface 269


  Cisco SDM Wizards 272


  Locking Down a Router with SDM 272

Secure Router Management 275


  Maintaining Cisco IOS Software Images 275


  Managing Cisco IOS Images 276


  Managing Cisco IOS Images 283


  Backing Up and Upgrading a Software Image 284


  Recovering Software Images 288


  Troubleshooting Cisco IOS Configurations 294


  Recovering a Lost Password 297

Summary 301

Labs 301

Check Your Understanding 302

Challenge Questions and Activities 308

Chapter 5 ACLs 309

Objectives 309

Key Terms 309

Using ACLs to Secure Networks 310


  A TCP Conversation 310


  Packet Filtering 313


  What Is an ACL? 316


  ACL Operation 318


  Types of Cisco ACLs 322


  How a Standard ACL Works 323


  Numbering and Naming ACLs 323


  Where to Place ACLs 324


  General Guidelines for Creating ACLs 327

Configuring Standard ACLs 327


  Entering Criteria Statements 327


  Configuring a Standard ACL 328


  ACL Wildcard Masking 332


  Applying Standard ACLs to Interfaces 339


  Editing Numbered ACLs 343


  Creating Standard Named ACLs 345


  Monitoring and Verifying ACLs 346


  Editing Named ACLs 347

Configuring an Extended ACL 348


  Extended ACLs 349


  Configuring Extended ACLs 351


  Applying Extended ACLs to the Interfaces 353


  Creating Named Extended ACLs 355

Configure Complex ACLs 357


  What Are Complex ACLs? 357


  Dynamic ACLs 358


  Reflexive ACLs 360


  Time-Based ACLs 363


  Troubleshooting Common ACL Errors 364

Summary 368

Labs 368

Check Your Understanding 369

Challenge Questions and Activities 375

Chapter 6 Teleworker Services 377

Objectives 377

Key Terms 377

Business Requirements for Teleworker Services 379


  The Business Requirements for Teleworker Services 379


  The Teleworker Solution 380

Broadband Services 384


  Connecting Teleworkers to the WAN 384


  Cable 385


  DSL 391


  Broadband Wireless 396

VPN Technology 401


  VPNs and Their Benefits 402


  Types of VPNs 405


  VPN Components 407


  Characteristics of Secure VPNs 408


  VPN Tunneling 409


  VPN Data Confidentiality and Integrity 410


  IPsec Security Protocols 416

Summary 419

Labs 419

Check Your Understanding 419

Challenge Questions and Activities 423

Chapter 7 IP Addressing Services 429

Objectives 429

Key Terms 429

Introduction 431

DHCP 431


  Introduction to DHCP 432


  DHCP Operation 432


  BOOTP and DHCP 435


  Configuring a Cisco Router as a DHCP Server 440


  Configuring a DHCP Client 447


  DHCP Relay 449


  Configuring a DHCP Server Using SDM 453


  Troubleshooting DHCP Configuration 456

Scaling Networks with NAT 460


  What Is NAT? 462


  Benefits and Drawbacks of Using NAT 468


  Configuring Static NAT 470


  Configuring Dynamic NAT 471


  Configuring NAT Overload for a Single Public IP Address 473


  Configuring NAT Overload for a Pool of Public IP Addresses 475


  Configuring Port Forwarding 477


  Verifying NAT and NAT Overload 479


  Troubleshooting NAT and NAT Overload Configuration 483

IPv6 485


  Reasons for Using IPv6 489


  IPv6 Addressing 493


  IPv6 Transition Strategies 499


  Cisco IOS Dual Stack 500


  IPv6 Tunneling 502


  Routing Configurations with IPv6 503


  Configuring IPv6 Addresses 506


  Configuring RIPng with IPv6 508

Summary 512

Labs 512

Check Your Understanding 514

Challenge Questions and Activities 522

Chapter 8 Network Troubleshooting 525

Objectives 525

Key Terms 525

Establishing the Network Performance Baseline 526


  Documenting Your Network 526


  Network Documentation Process 533


  Why Is Establishing a Network Baseline Important? 535


  Steps for Establishing a Network Baseline 535

Troubleshooting Methodologies and Tools 541


  A General Approach to Troubleshooting 541


  Using Layered Models for Troubleshooting 541


  General Troubleshooting Procedures 544


  Troubleshooting Methods 545


  Gathering Symptoms 548


  Troubleshooting Tools 551

Review of WAN Communications 560


  WAN Communications 560


  Steps in WAN Design 561


  WAN Traffic Considerations 562


  WAN Topology Considerations 564


  WAN Connection Technologies 567


  WAN Bandwidth Considerations 568


  Common WAN Implementations Issues 569


  WAN Troubleshooting from an ISP's Perspective 570

Network Troubleshooting 571


  Physical Layer Troubleshooting 573


  Data Link Layer Troubleshooting 577


  Network Layer Troubleshooting 584


  Transport Layer Troubleshooting 586


  Application Layer Troubleshooting 589

Summary 595

Labs 595

Check Your Understanding 596

Challenge Questions and Activities 600

Appendix 601

Glossary 637



About the Authors

top


Bob Vachon is the coordinator of the Computer Systems Technology program at Cambrian College in Sudbury, Ontario, Canada, where he teaches networking infrastructure courses.

He has worked and taught in the computer networking and information technology field since 1984. He is a scholar graduate of Cambrian College, and he received the prestigious

Teaching Excellence Award in 1997. Vachon has been a Cisco Networking Academy instructor since 1999 and has been CCNP certified since 2002. He has worked with Cisco

as team lead, author, CCNP certification assessment developer, and subject matter expert on a variety of projects, including CCNA, CCNP, and global partner training courses. He

enjoys playing the guitar and being outdoors, either working in his gardens or white-water canoe tripping.

Rick Graziani teaches computer science and computer networking courses at Cabrillo College in Aptos, California. He has worked and taught in the computer networking and

information technology fields for almost 30 years. Before that, he worked in IT for various companies, including Santa Cruz Operation, Tandem Computers, and Lockheed Missiles

and Space Corporation. He holds an M.A. in computer science and systems theory from California State University Monterey Bay. Graziani also does consulting work for Cisco and

other companies. When he is not working, he is most likely surfing. He is an avid surfer who enjoys longboarding at his favorite Santa Cruz surf breaks.