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Interconnecting Cisco Network Devices, Part 1 (ICND1) Foundation Learning Guide, 4th Edition

Interconnecting Cisco Network Devices, Part 1 (ICND1) Foundation Learning Guide, 4th Edition

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  • Copyright 2013
  • Dimensions: 7-3/8" x 9-1/8"
  • Edition: 4th
  • eBook (Watermarked)
  • ISBN-10: 0-13-341026-9
  • ISBN-13: 978-0-13-341026-6

This Cisco-authorized, self-paced foundation learning tool for both the CCENT 100-101 and CCNA® 200-120 exams offers a comprehensive overview of the diverse technologies found in modern internetworks. From routing and switching concepts to practical configuration and security, it teaches with numerous examples, illustrations, and real-world scenarios, helping you rapidly gain both expertise and confidence.

This book provides you with all the knowledge you need to install, operate and troubleshoot a small enterprise branch network, including basic network security.  Whether you are preparing for certification or simply want to understand basic Cisco networking, you’ll find this guide exceptionally valuable. Topics covered include: TCP/IP models and protocols; LANs and Ethernet; running Cisco IOS; VLANs and trunks; IP addressing and subnetting; packet delivery; static and dynamic routing; DHCP and NAT; network security; WANs, IPv6, and more.

This edition has been fully updated to reflect the new Cisco ICND1 100-101 exam blueprint. Content has been reorganized, simplified, and expanded to help you learn even more efficiently. New Production Network Simulation questions offer more real-world review, and new web video resources in each chapter walks you through many key tasks.

Interconnecting Cisco Network Devices, Part 1 (ICND1) Foundation Learning Guide, Fourth Edition is part of a recommended learning path from Cisco that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from Cisco Press. To find out more about instructor-led training, e-learning, and hands-on instruction from authorized Cisco Learning Partners worldwide, please visit www.cisco.com/go/authorizedtraining.

  • Network functions, components, models, layers, topologies, and applications
  • LAN, Ethernet, switching, routing, and packet delivery concepts
  • Network management with Cisco IOS software and its command-line interface
  • VLANs and segmentation: techniques for optimizing performance and flexibility
  • Easy ways to create efficient IP addressing and subnetting schemes
  • Cisco router configuration, including static and dynamic routing
  • DHCP and NAT: dynamically providing IP addresses and handling limited address availability
  • Essential network security techniques
  • Traffic management with Access Control Lists
  • WAN concepts, technologies, and options
  • IPv6 configuration in dynamically routed network environments

Sample Content

Table of Contents

    Introduction xxi

Chapter 1 The Functions of Networking 1

    Chapter Objectives 2

    What Is a Network? 2

    Physical Components of a Network 4

    Interpreting a Network Diagram 5

    Network User Applications 7

    Impact of User Applications on the Network 8

    Characteristics of a Network 10

    Physical Versus Logical Topologies 11

        Physical Topologies 11

        Logical Topologies 12

        Bus Topology 13

        Star and Extended-Star Topologies 14

        Star Topology 14

        Extended-Star Topology 15

        Ring Topologies 16

        Single-Ring Topology 16

        Dual-Ring Topology 17

        Mesh and Partial-Mesh Topologies 17

        Full-Mesh Topology 17

        Partial-Mesh Topology 18

    Connections to the Internet 18

Chapter 2 The OSI and TCP/IP Models 25

    Chapter Objectives 26

    Understanding the Host-to-Host Communications Model 26

    The OSI Reference Model 27

        Layer 7: The Application Layer 29

        Layer 6: The Presentation Layer 29

        Layer 5: The Session Layer 29

        Layer 4: The Transport Layer 30

        Layer 3: The Network Layer 30

        Layer 2: The Data Link Layer 31

        Layer 1: The Physical Layer 31

    The Data Communications Process 31

        Encapsulation 32

        Deencapsulation 33

    Peer-to-Peer Communication 34

    The TCP/IP Protocol Stack 35

    OSI Model Versus TCP/IP Stack 36

Chapter 3 LANs and Ethernet 43

    Chapter Objectives 44

    Understanding LANs 44

        The Definition of a LAN 44

        Components of a LAN 45

        Functions of a LAN 46

        How Big Is a LAN? 47

        Ethernet 48

        Ethernet LAN Standards 48

        LLC Sublayer 49

        MAC Sublayer 49

        The Role of CSMA/CD in Ethernet 49

        Ethernet Frames 50

        Ethernet Frame Addressing 52

        Ethernet Addresses 52

        MAC Addresses and Binary-Hexadecimal Numbers 53

    Connecting to an Ethernet LAN 54

        Ethernet Network Interface Cards 54

        Ethernet Media and Connection Requirements 55

        Connection Media 55

        Unshielded Twisted-Pair Cable 57

        UTP Implementation 58

        Auto-MDIX 62

        Optical Fiber 62

Chapter 4 Operating Cisco IOS Software 69

    Chapter Objectives 70

    Cisco IOS Software Features and Functions 70

    Cisco IOS CLI Functions 71

    Configuring Network Devices 72

    External Configuration Sources 73

    Entering the EXEC Modes 75

    Help in the CLI 77

        Enhanced Editing Commands 79

        Command History 81

    Managing Cisco IOS Configuration 81

    Improving the User Experience in the CLI 84

Chapter 5 Switch Technologies 89

    Chapter Objectives 90

    The Need for Switches 90

    Switch Characteristics 92

    Starting and Configuring a Switch 93

        Switch Installation 93

        Switch LED Indicators 93

        Connecting to the Console Port 94

        Basic Switch Configuration 95

        Verifying the Switch Initial Startup Status 97

    Switching Operation 99

        Duplex Communication 100

    Troubleshooting Common Switch Media Issues 102

        Media Issues 102

        Port Issues 106

Chapter 6 VLANs and Trunks 111

    Chapter Objectives 112

    Implementing VLANs and Trunks 112

        Issues in a Poorly Designed Network 112

        VLAN Overview 114

        Understanding Trunking with 802.1Q 115

        802.1Q Frame 116

        802.1Q Native VLAN 117

        Understanding VLAN Trunking Protocol 118

        VTP Modes 118

        VTP Operation 119

        VTP Pruning 120

        Configuring VLANs and Trunks 121

        VTP Configuration 122

        Example: VTP Configuration 122

        802.1Q Trunking Configuration 123

        VLAN Creation 126

        VLAN Port Assignment 128

        Adds, Moves, and Changes for VLANs 129

        Adding VLANs and Port Membership 129

        Changing VLANs and Port Membership 130

        Deleting VLANs and Port Membership 130

        VLAN Design Considerations 130

        Physical Redundancy in a LAN 131

    Routing Between VLANs 133

        Understanding Inter-VLAN Routing 133

        Example: Router on a Stick 134

        Example: Subinterfaces 135

        Configuring Inter-VLAN Routing Using Router on a Stick 135

        Using Multilayer (Layer 3) Switches 136

Chapter 7 The TCP/IP Internet Layer 139

    Chapter Objectives 140

    Understanding TCP/IP’s Internet Layer 140

        IP Network Addressing 140

        IP Address Classes 143

        Network and Broadcast Addresses 145

        Public and Private IP Addresses 149

        Address Exhaustion 150

    Addressing Services 153

        Dynamic Host Configuration Protocol 154

        Domain Name System 155

        Using Common Host Tools to Determine the IP Address of a Host 155

Chapter 8 IP Addressing and Subnets 161

    Chapter Objectives 161

    Understanding Binary Numbering 162

        Decimal and Binary Systems 162

        Least Significant Bit and Most Significant Bit 163

        Base 2 Conversion System 164

        Powers of 2 164

        Decimal-to-Binary Conversion 165

        Binary-to-Decimal Conversion 166

    Constructing a Network Addressing Scheme 167

        Subnetworks 167

        Two-Level and Three-Level Addresses 169

        Subnet Creation 170

        Computing Usable Subnetworks and Hosts 170

        Computing Hosts for a Class C Subnetwork 170

        Computing Hosts for a Class B Subnetwork 171

        Computing Hosts for a Class A Subnetwork 172

        How End Systems Use Subnet Masks 173

        How Routers Use Subnet Masks 174

        Mechanics of Subnet Mask Operation 176

        Applying Subnet Mask Operation 178

        Determining the Network Addressing Scheme 179

        Class C Example 180

        Class B Example 181

        Class A Example 183

    Implementing Variable-Length Subnet Masks 184

        Introducing VLSMs 184

        Route Summarization with VLSM 187

Chapter 9 The TCP/IP Transport Layer 195

    Chapter Objectives 195

    Understanding TCP/IP’s Transport Layer 196

        The Transport Layer 196

        TCP/IP Applications 199

        Transport Layer Functionality 200

        TCP/UDP Header Format 202

        How TCP and UDP Use Port Numbers 204

        Establishing a TCP Connection: The Three-Way Handshake 205

        Session Multiplexing 208

        Segmentation 209

        Flow Control for TCP/UDP 209

        Acknowledgment 210

        Windowing 211

        Fixed Windowing 211

        Example: Throwing a Ball 212

        TCP Sliding Windowing 213

        Maximize Throughput 214

        Global Synchronization 214

Chapter 10 The Functions of Routing 219

    Chapter Objectives 220

    Exploring the Functions of Routing 220

        Routers 220

        Path Determination 222

        Routing Tables 223

        Routing Table Information 223

        Routing Update Messages 224

        Static, Dynamic, Directly Connected, and Default Routes 224

        Dynamic Routing Protocols 225

        Routing Metrics 225

        Routing Methods 226

Chapter 11 The Packet Delivery Process 233

    Chapter Objectives 233

    Exploring the Packet Delivery Process 234

        Layer 1 Devices and Their Functions 234

        Layer 2 Devices and Their Functions 234

        Layer 2 Addressing 235

        Layer 3 Devices and Their Functions 236

        Layer 3 Addressing 236

        Mapping Layer 2 Addressing to Layer 3 Addressing 237

        ARP Table 238

        Host-to-Host Packet Delivery 238

        Function of the Default Gateway 247

        Using Common Host Tools to Determine the Path Between Two Hosts Across a Network 248

Chapter 12 Configuring a Cisco Router 255

    Chapter Objectives 255

    Starting a Cisco Router 256

        Initial Startup of a Cisco Router 256

        Initial Setup of a Cisco Router 257

        Logging In to the Cisco Router 263

        Showing the Router Initial Startup Status 266

        Summary of Starting a Cisco Router 267

    Configuring a Cisco Router 267

        Cisco Router Configuration Modes 268

        Configuring a Cisco Router from the CLI 269

        Configuring Cisco Router Interfaces 271

        Configuring the Cisco Router IP Address 272

        Verifying the Interface Configuration 273

        Verifying the Interface Configuration 277

Chapter 13 Static Routing 285

    Chapter Objectives 285

    Enabling Static Routing 286

        Routing Overview 286

        Static and Dynamic Route Comparison 287

        Static Route Configuration 288

        Example: Understanding Static Routes 288

        Example: Configuring Static Routes 289

        Default Route Forwarding Configuration 290

        Static Route Verification 290

Chapter 14 Dynamic Routing Protocols 293

    Chapter Objectives 294

    Dynamic Routing Protocol Overview 294

        Features of Dynamic Routing Protocols 296

        Example: Administrative Distance 296

        Classful Routing Versus Classless Routing Protocols 297

        Distance Vector Route Selection 299

        Example: Distance Vector Routing Protocols 299

        Example: Sources of Information and Discovering Routes 300

        Understanding Link-State Routing Protocols 300

        Link-State Routing Protocol Algorithms 304

Chapter 15 OSPF 311

    Chapter Objectives 311

    Introducing OSPF 312

        Establishing OSPF Neighbor Adjacencies 313

        SPF Algorithm 315

        Configuring and Verifying OSPF 316

        Loopback Interfaces 317

        Verifying the OSPF Configuration 318

        Load Balancing with OSPF 326

        OSPF Authentication 328

        Types of Authentication 328

        Configuring Plaintext Password Authentication 329

        Example: Plaintext Password Authentication Configuration 330

        Verifying Plaintext Password Authentication 331

    Troubleshooting OSPF 332

        Components of Troubleshooting OSPF 332

        Troubleshooting OSPF Neighbor Adjacencies 333

        Troubleshooting OSPF Routing Tables 336

        Troubleshooting Plaintext Password Authentication 337

Chapter 16 DHCP and NAT 343

    Chapter Objectives 343

    Using a Cisco Router as a DHCP Server 344

        Understanding DHCP 344

        DHCPDISCOVER 344

        DHCPOFFER 345

        DHCPREQUEST 345

        DHCPACK 345

        Configuring a Cisco Router as a DHCP Client 345

        Using a Cisco Router as a DHCP Server 345

        Using a Cisco Router as a DHCP Relay Agent 347

    Scaling the Network with NAT and PAT 347

        Introducing NAT and PAT 348

        Translating Inside Source Addresses 350

        Static NAT Address Mapping 353

        Dynamic Address Translation 354

        Overloading an Inside Global Address 355

        Resolving Translation Table Issues 359

        Resolving Issues by Using the Correct Translation Entry 362

Chapter 17 Securing the Network 371

    Chapter Objectives 372

    Securing the Network 372

        Need for Network Security 372

        Balancing Network Security Requirements 375

        Adversaries, Hacker Motivations, and Classes of Attack 376

        Classes of Attack 376

        Mitigating Common Threats 377

        Physical Installations 377

        Reconnaissance Attacks 378

        Access Attacks 379

        Password Attacks 379

    Understanding Cisco Device Security 380

        Physical and Environmental Threats 380

        Configuring Password Security 380

        Configuring the Login Banner 382

        Telnet Versus SSH Access 383

        Port Security Configuration on Switches 384

        Securing Unused Ports 387

Chapter 18 Managing Traffic with Access Control Lists 391

    Chapter Objectives 392

    Access Control List Operation 392

        Understanding ACLs 392

        ACL Operation 395

        Types of ACLs 398

        ACL Identification 398

        Additional Types of ACLs 401

        Dynamic ACLs 401

        Reflexive ACLs 402

        Time-Based ACLs 404

        ACL Wildcard Masking 405

    Configuring ACLs 408

        Configuring Numbered Standard IPv4 ACLs 408

        Example: Numbered Standard IPv4 ACL—Permit My Network Only 409

        Example: Numbered Standard IPv4 ACL—Deny a Specific Host 410

        Example: Numbered Standard IPv4 ACL—Deny a Specific Subnet 411

        Controlling Access to the Router Using ACLs 413

        Configuring Numbered Extended IPv4 ACLs 413

        Extended ACL with the established Parameter 416

        Numbered Extended IP ACL: Deny FTP from Subnets 417

        Numbered Extended ACL: Deny Only Telnet from Subnet 418

        Configuring Named ACLs 419

        Creating Named Standard IP ACLs 420

        Creating Named Extended IP ACLs 421

        Named Extended ACL: Deny a Single Host from a Given Subnet 422

        Named Extended ACL—Deny a Telnet from a Subnet 424

        Adding Comments to Named or Numbered ACLs 425

    Troubleshooting ACLs 425

        Problem: Host Connectivity 427

Chapter 19 Introducing WAN Technologies 433

    Chapter Objectives 433

    Introducing WANs 434

        WANs Versus LANs 435

        The Role of Routers in the WAN 437

        WAN Communication Link Options 437

        Point-to-Point Connectivity 438

        Configuring a Point-to-Point Link 438

Chapter 20 Introducing IPv6 441

    Chapter Objectives 441

    Overview of IPv6 442

        IPv6 Features and Addresses 443

        IPv6 Address Types 444

        IPv6 Address Allocation Options 446

        IPv6 Header Changes and Benefits 447

    Other IPv6 Features 449

        ICMPv6 449

        Neighbor Discovery 449

        Stateless Autoconfiguration 449

    IPv6 Routing 450

        Basic IPv6 Connectivity 451

        Configuring IPv6 Routing 452

        Static Routing 452

        OSPFv3 452

Appendix A Answers to Chapter Review Questions 457

Appendix B Acronyms and Abbreviations 471

Glossary 477

TOC, 9781587143762, 5/21/2013


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