Todd Lammle prepares you for Cisco's entry-level networking certification exam, CCENT

If you're preparing for your Cisco Certified Entry Networking Technician (CCENT) certification, CCENT: Cisco Certified Entry Networking Technician Study Guide, Second Edition is the book you need. Cisco working authority Todd Lammle covers all the objectives for exam ICND1?the required exam for all CCENT candidates. It also includes useful hands-on labs and practice test questions.

• Prepares CCENT candidates for exam 640-822: Interconnecting Cisco Networking Devices Part 1 (ICND1)
• Expert instruction from well-known, leading Cisco networking authority Todd Lammle
• Covers all exam objectives and features expanded coverage on key topics in the exam
• Includes hands-on labs, real-world scenarios, and challenging review questions
• Gives you online access to bonus practice exams, electronic flashcards, a searchable glossary, and more

In addition, you'll get online access to practice exams, electronic flashcards, and a searchable glossary?everything you need to prepare for the exam.

Exam Objectives xxvii

Assessment Test xxx

Chapter 1 Internetworking 1

Internetworking Basics 2

Addressing 3

Internetworking Models 11

The Layered Approach 11

Advantages of Reference Models 12

The OSI Reference Model 12

The Application Layer 15

The Presentation Layer 15

The Session Layer 16

The Transport Layer 16

The Network Layer 22

The Data Link Layer 24

The Physical Layer 27

Ethernet Networking 28

Collision Domain 28

Broadcast Domain 29

CSMA/CD 29

Half- and Full-Duplex Ethernet 31

Ethernet at the Data Link Layer 32

Ethernet at the Physical Layer 38

Ethernet Cabling 43

Straight-Through Cable 43

Crossover Cable 44

Rolled Cable 44

Data Encapsulation 47

Summary 51

Exam Essentials 52

Written Lab 1 54

Written Lab 1.1: OSI Questions 54

Written Lab 1.2: Defining the OSI Layers and Devices 55

Written Lab 1.3: Identifying Collision and Broadcast

Domains 56

Written Lab 1.4: Binary/Decimal/Hexadecimal Conversion 57

Review Questions 60

Chapter 2 Internet Protocols 65

TCP/IP and the DoD Model 66

The Process/Application Layer Protocols 68

The Host-to-Host Layer Protocols 75

The Internet Layer Protocols 85

IP Addressing 95

IP Terminology 95

The Hierarchical IP Addressing Scheme 96

Private IP Addresses 101

IPv4 Address Types 102

Layer 2 Broadcasts 103

Layer 3 Broadcasts 103

Unicast Address 103

Multicast Address 104

Summary 104

Exam Essentials 105

Written Lab 2 107

Review Questions 108

Chapter 3 IP Subnetting, Troubleshooting IP, and

Introduction to NAT 113

Subnetting Basics 114

IP Subnet-Zero 115

How to Create Subnets 116

Subnet Masks 117

Classless Inter-Domain Routing (CIDR) 118

Subnetting Class C Addresses 120

Subnetting Class B Addresses 130

Subnetting Class A Addresses 137

Troubleshooting IP Addressing 140

Determining IP Address Problems 143

Introduction to Network Address Translation (NAT) 148

Types of Network Address Translation 149

NAT Names 150

How NAT Works 150

Summary 152

Exam Essentials 153

Written Labs 3 154

Written Lab 3.1: Written Subnet Practice #1 154

Written Lab 3.2: Written Subnet Practice #2 155

Written Lab 3.3: Written Subnet Practice #3 155

Review Questions 156

hapter 4 Cisco’s Internetworking Operating System (IOS) 161

The IOS User Interface 163

Cisco Router IOS 163

Connecting to a Cisco Router 163

Bringing Up a Router 165

Command-Line Interface (CLI) 169

Entering the CLI 169

Overview of Router Modes 170

CLI Prompts 170

Editing and Help Features 173

Gathering Basic Routing Information 178

Router and Switch Administrative Configurations 179

Hostnames 180

Banners 180

Setting Passwords 182

Setting Interface Descriptions 190

Router Interfaces 192

Bringing Up an Interface 195

Configuring an IP Address on an Interface 196

Viewing, Saving, and Erasing Configurations 201

Deleting the Configuration and Reloading the Router 202

Verifying Your Configuration 203

Summary 213

Exam Essentials 213

Written Lab 4 216

Hands-on Labs 217

Hands-on Lab 4.1: Erasing an Existing Configuration 217

Hands-on Lab 4.2: Exploring User, Privileged,

and Configuration Modes 218

Hands-on Lab 4.3: Using the Help and Editing Features 218

Hands-on Lab 4.4: Saving a Router Configuration 220

Hands-on Lab 4.5: Setting Passwords 220

Hands-on Lab 4.6: Setting the Hostname, Descriptions,

IP Address, and Clock Rate 222

Review Questions 225

Chapter 5 Managing a Cisco Internetwork 231

The Internal Components of a Cisco Router 232

The Router Boot Sequence 233

Managing Configuration Register 234

Understanding the Configuration Register Bits 234

Checking the Current Configuration Register Value 236

Changing the Configuration Register 237

Recovering Passwords 238

Boot System Commands 242

Backing Up and Restoring the Cisco IOS 243

Verifying Flash Memory 244

Backing Up the Cisco IOS 245

Restoring or Upgrading the Cisco Router IOS 246

Using the Cisco IOS File System (Cisco IFS) 247

Backing Up and Restoring the Cisco Configuration 252

Backing Up the Cisco Router Configuration 252

Restoring the Cisco Router Configuration 254

Erasing the Configuration 255

Using the Cisco IOS File System to Manage Your

Router’s Configuration (Cisco IFS) 256

Using Cisco Discovery Protocol 258

Getting CDP Timers and Holdtime Information 258

Gathering Neighbor Information 259

Gathering Interface Traffic Information 264

Gathering Port and Interface Information 264

Documenting a Network Topology Using CDP 267

Using Telnet 270

Telnetting into Multiple Devices Simultaneously 272

Checking Telnet Connections 273

Checking Telnet Users 273

Closing Telnet Sessions 274

Resolving Hostnames 274

Building a Host Table 275

Using DNS to Resolve Names 277

Checking and Troubleshooting Network Connectivity 279

Using the ping Command 280

Using the traceroute Command 280

Debugging 282

Using the show processes Command 284

Summary 285

Exam Essentials 286

Written Lab 5 287

Written Lab 5.1 287

Written Lab 5.2 288

Hands-on Labs 288

Hands-on Lab 5.1: Backing Up Your Router IOS 289

Hands-on Lab 5.2: Upgrading or Restoring Your

Router IOS 289

Hands-on Lab 5.3: Backing Up the Router Configuration 290

Hands-on Lab 5.4: Using the Cisco Discovery

Protocol (CDP) 290

Hands-on Lab 5.5: Using Telnet 291

Hands-on Lab 5.6: Resolving Hostnames 292

Review Questions 294

Chapter 6 IP Routing 299

Routing Basics 301

The IP Routing Process 303

Testing Your IP Routing Understanding 309

Configuring IP Routing 313

Configuring IP Routing in the Network 327

Static Routing 327

Default Routing 338

Dynamic Routing 341

Routing Protocol Basics 341

Distance-Vector Routing Protocols 343

Routing Loops 345

Routing Information Protocol 347

RIP Timers 348

Configuring RIP Routing 348

Verifying the RIP Routing Tables 351

Configuring RIP Routing Example 2 353

Holding Down RIP Propagations 354

RIP Version 2 355

Verifying Your Configurations 358

The show ip protocols Command 358

The debug ip rip Command 360

Enabling RIPv2 on the Internetwork 363

Summary 367

Exam Essentials 368

Written Lab 6 369

Hands-on Labs 370

Hands-on Lab 6.1: Creating Static Routes 371

Hands-on Lab 6.2: Configuring RIP Routing 372

Review Questions 374

Chapter 7 Layer 2 Switching 381

Before Layer 2 Switching 382

Switching Services 385

Limitations of Layer 2 Switching 386

Bridging vs. LAN Switching 387

Three Switch Functions at Layer 2 387

Address Learning 388

Forward/Filter Decisions 389

Port Security 391

Cisco Catalyst Switches 392

S1 394

S2 395

Core 396

Summary 398

Exam Essentials 399

Written Lab 7 399

Review Questions 400

Chapter 8 Wireless Technologies 407

Introducing Wireless Technology 408

The 802.11 Standards 410

2.4GHz (802.11b) 412

2.4GHz (802.11g) 413

5GHz (802.11a) 414

Comparing 802.11 415

2.4GHz/5GHz (802.11n) 416

Basic Service Sets 417

BSS/IBSS 418

ESS 419

Wireless Security 419

Open Access 420

SSIDs, WEP, and MAC Address Authentication 420

WPA or WPA 2 Pre-Shared Key 421

Summary 422

Exam Essentials 423

Written Lab 8 423

Review Questions 424

Chapter 9 Security 429

Introduction to Security 430

Recognizing Security Threats 431

Common Attack Profiles 432

Mitigating Security Threats 435

Mitigating Password, Router, and Switch Attacks 436

Switch Port Security 437

Virtual Private Networks 440

IPsec 442

Summary 442

Exam Essentials 443

Written Lab 9 443

Review Questions 444

Chapter 10 Introduction to Wide Area Networks 449

Introduction to Wide Area Networks 450

Defining WAN Terms 451

WAN Connection Types 452

WAN Support 453

Cabling the Wide Area Network 455

Serial Transmission 455

Data Terminal Equipment and Data Communication

Equipment 456

High-Level Data-Link Control (HDLC) Protocol 457

Point-to-Point Protocol 459

PPP Session Establishment 460

PPP Authentication Methods 461

Configuring PPP on Cisco Routers 462

Configuring PPP Authentication 462

Verifying PPP Encapsulation 463

Summary 464

Exam Essentials 465

Written Lab 10 466

Hands-on Labs 466

Hands-on Lab 10.1: Configuring PPP Encapsulation and

Authentication 466

Hands-on Lab 10.2: Configuring and Monitoring HDLC 468

Review Questions 469

Appendix A Answers to Written Labs 475

Chapter 1: Internetworking 476

Written Lab 1.1 476

Written Lab 1.2 477

Written Lab 1.3 477

Written Lab 1.4 478

Chapter 2: Internet Protocols 481

Written Lab 2 481

Chapter 3: IP Subnetting, Troubleshooting IP, and

Introduction to NAT 481

Written Lab 3.1 481

Written Lab 3.2 482

Written Lab 3.3 483

Chapter 4: Cisco’s Internetworking Operating System (IOS) 484

Written Lab 4 484

Chapter 5: Managing a Cisco Internetwork 485

Written Lab 5.1 485

Written Lab 5.2 485

Chapter 6: IP Routing 486

Written Lab 6 486

Chapter 7: Layer 2 Switching 486

Written Lab 7 486

Chapter 8: Wireless Technologies 487

Written Lab 8 487

Chapter 9: Security 487

Written Lab 9 487

Chapter 10: Introduction to Wide Area Networks 488

Written Lab 10 488

Appendix B Answers to Review Questions 489

Chapter 1: Internetworking 490

Chapter 2: Internet Protocols 492

Chapter 3: IP Subnetting, Troubleshooting IP, and

Introduction to NAT 493

Chapter 4: Cisco’s Internetworking Operating System (IOS) 496

Chapter 5: Managing a Cisco Internetwork 497

Chapter 6: IP Routing 499

Chapter 7: Layer 2 Switching 501

Chapter 8: Wireless Technologies 503

Chapter 9: Security 504

Chapter 10: Introduction to Wide Area Networks 506

Appendix C About the Additional Study Tools 509

Additional Study Tools 510

Sybex Test Engine 510

Electronic Flashcards 510

Study Sheets 510

Todd Lammle Videos 511

Todd Lammle Audios 511

PDF of Glossary of Terms 511

Adobe Reader 511

System Requirements 511

Using the Study Tools 511

Troubleshooting 512

Customer Care 512

Index 513

Todd Lammle, CCSI, CCNA, CCNP, CCSP, CCVP, is the authority on Cisco networking. He has been involved in computers and networking with Fortune 500 companies for almost 30 years. Todd is President of GlobalNet Training, Inc., a networking integration and training firm based in Dallas. He is the bestselling author of numerous Cisco books, including the popular CCNA: Cisco Certified Network Associate Study Guide, with over 200,000 copies in print. He can be reached through his website at www.lammle.com.