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

Cisco Press
Anthony J. Sequeira  
Total pages
June 2013
Related Titles

Product detail

Product Price CHF Available  
Interconnecting Cisco Network Devices, Part 1 (ICND1) Foundation Learning Guide
66.30 approx. 7-9 days


This book provides students with all the knowledge they need to install, operate, and troubleshoot a small enterprise branch network, including basic network security. Whether they are preparing for certification or simply want to understand basic Cisco networking, they'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. From routing and switching concepts to practical configuration and security, it teaches with numerous examples, illustrations, and real-world scenarios, helping students rapidly gain both expertise and confidence.


  • Revision of the popular second edition, updated to cover the latest CCENT exam topics
  • Unique content developed in conjunction with the Cisco certification team, the developers of the CCNA recommended courses and CCNA exams
  • Includes self-assessment review questions, example output, and a detailed case study

New to this Edition

  • Updated to cover latest CCENT exam topics
  • Reflects the new Cisco ICND1 100-101 exam blueprint
  • Content has been reorganized, simplified, and expanded to help students learn even more efficiently
  • New Production Network Simulation questions offer more real-world review
  • New web video resources in each chapter walk students through many key tasks

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





  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



Anthony Sequeira, CCIE No. 15626, is a seasoned trainer and author regarding all levels and tracks of Cisco certification. Anthony formally began his career in the information technology industry in 1994 with IBM in Tampa, Florida. He quickly formed his own computer consultancy, Computer Solutions, and then discovered his true passion—teaching and writing about Microsoft and Cisco technologies.


Anthony joined Mastering Computers in 1996 and lectured to massive audiences around the world about the latest in computer technologies. Mastering Computers became the revolutionary online training company, KnowledgeNet, and Anthony trained there for many years.


Anthony is currently pursuing his second CCIE in the area of security and then his third Cisco Data Center! When not writing for Cisco Press, Anthony is a full-time instructor for the next-generation of KnowledgeNet,


Anthony is an avid tennis player, is a private pilot, and enjoys getting beaten up by women and children at his and his daughter’s martial arts school, .