Cisco Networking Essentials
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More About This Title Cisco Networking Essentials


An engaging approach for anyone beginning a career in networking

As the world leader of networking products and services, Cisco products are constantly growing in demand. Yet, few books are aimed at those who are beginning a career in IT--until now. Cisco Networking Essentials provides a solid foundation on the Cisco networking products and services with thorough coverage of fundamental networking concepts. Author Troy McMillan applies his years of classroom instruction to effectively present high-level topics in easy-to-understand terms for beginners. With this indispensable full-color resource, you'll quickly learn the concepts, processes, and skills that are essential to administer Cisco routers and switches.

Begins with a clear breakdown of what you can expect to learn in each chapter, followed by a straightforward discussion of concepts on core topicsIncludes suggested labs and review questions at the conclusion of each chapter, which encourage you to reinforce and measure your understanding of the topics discussedServes as an ideal starting point for learning Cisco networking products and services

If you are interested in a career in IT but have little or no knowledge of networking and are new to Cisco networking products, then this book is for you.


Troy McMillan holds more than 30 IT certifications, including CCNA and CCNP. He is a product developer and technical editor for Kaplan IT, Inc. He is also a full-time trainer, teaching classes on Cisco, Microsoft, CompTIA, and wireless.


Introduction xxi

Chapter 1 Networks 1

Describing Network Components  1

Defining the Benefits of Networks  2

Identifying the Requirements for a Network  5

Classifying Networks by Function 8

Understanding LANs  8

Understanding WANs 9

Defining Network Architectures  11

Understanding Peer-to-Peer Networks  11

Understanding Client-Server Networks  14

The Essentials and Beyond 17

Chapter 2 The OSI Model 19

Using Reference Models  19

Understanding the Benefits of Reference 20

Exploring Reference Model Examples 21

Introducing the Layers of the OSI Model  22

Understanding the Application Layer  23

Understanding the Presentation Layer 23

Understanding the Session Layer  25

Understanding the Transport Layer  26

Understanding the Network Layer  29

Understanding the Data-Link Layer  30

Understanding the Physical Layer 32

Describing the OSI Encapsulation Process 32

Identifying the Process on the Source Device  33

Identifying the Process on the Destination Device  34

The Essentials and Beyond 35

Chapter 3 TCP/IP 37

Understanding the TCP/IP Model 38

Exploring the Four Layers 39

Comparing the OSI and TCP/IP Models  42

Describing the TCP/IP Encapsulation Process  44

Understanding Data and PDUs  44

Describing the Contents of Data 45

Describing the Contents of Segments 45

Describing the Contents of Packets  46

Describing the Contents of Frames 46

Understanding the Conversion to Bits  47

Describing the Functions at the Transport Layer 48

Understanding TCP  49

Understanding UDP  50

Describing the Functions at the Internet Layer  52

Defining Logical Addressing  52

Performing Routing 53

Accomplishing Packet Forwarding  53

Describing the Functions of ARP 53

Illustrating the ARP Broadcast  54

Describing the Logic of MAC-to-IP-Address Conversion 56

The Essentials and Beyond 58

Chapter 4 Protocols 63

Understanding the Function of Protocols 63

Defining Routed Protocols 64

Defining Routing Protocols 64

Exploring Application Layer Protocols  65

Describing FTP 65

Describing TFTP  67

Describing SMTP  67

Describing DNS  69

Describing SNMP 70

Exploring Transport Layer Protocols 72

Reviewing TCP 72

Reviewing UDP 76

Exploring Internet Layer Protocols  77

Describing IP  77

Describing ARP  79

Describing ICMP  80

Describing IGMP  82

Exploring Network Access Layer Protocols 83

Defining Network Access Layer Protocols on the LAN 84

Defining Network Access Layer Protocols on the WAN 85

The Essentials and Beyond 86

Chapter 5 Physical and Logical Topologies 89

Designing the Physical Topology 89

Implementing a Bus Topology 90

Implementing a Ring Topology 91

Implementing a Star Topology  92

Implementing a Mesh Topology  94

Implementing a Hybrid Topology  95

Implementing a Point-to-Point Topology  96

Implementing a Point-to-Multipoint Topology 98

Designing the Logical Topology 99

Understanding the Token Ring Topology  99

Understanding the FDDI Ring Topology 100

Understanding the Star Topology  101

The Essentials and Beyond 102

Chapter 6 Numbering Systems 105

Exploring Binary Numbering 105

Understanding the Base-2 Numbering System 106

Understanding the Relationship between Binary and Computers 108

Exploring Hexadecimal Numbering  110

Understanding the Base-16 Numbering System 110

Identifying MAC Addresses  113

Applying Conversions 114

Decimal-to-Binary Conversion  114

Hex-to-Decimal Conversion 117

Binary-to-Hex Conversion 119

The Essentials and Beyond 121

Chapter 7 Classful IP Addressing 125

Describing the Function of IP Addresses 125

Identification  126

Segmentation 127

Identifying IP Address Types  128

Defining IP Address Classes 129

Identifying Network and Host Addresses  130

Describing Private IP Addresses and NAT 134

Utilizing Diagnostic Tools 135

Executing the ipconfig Command  137

Executing the ping Command 137

Executing the arp Command  138

Executing the traceroute Command 139

Understanding DHCP  139

Operations  139

Cisco DHCP  141

Introducing IPv6 142

IPv6 Address Format  142

IPv6 Address Types 143

Special IPv6 Addresses 144

Essentials and Beyond  144

Chapter 8 Classless IP Addressing 147

Understanding the Limitations of Classful Networking 147

Exhaustion of the Class B Network Address Space 148

Unmanageable Routing Tables  148

Exhaustion of the 32-Bit IPv4 Address Space 149

Understanding the Benefits of Subnetting  149

Identifying Sources of Network Congestion 150

Deploying Subnetting as a Segmentation Tool 151

Describing the Components of CIDR 152

Introducing Classless Subnetting 152

Understanding VLSM 161

Summarization  166

The Essentials and Beyond 166

Chapter 9 Media 169

Selecting the Proper Media Type  169

Bandwidth  170

Security  170

Convenience 174

Cost 174

Understanding Cabling 175

Describing Cable Behavior and Characteristics  175

Describing Physical Implementations 176

Choosing the Correct Wiring Standard  180

Describing Wireless Standards 184

Identifying Standards Bodies  185

Understanding 802.11 Amendments 185

Understanding Wireless LAN Components and Terminology  187

Describing CSMA/CA Operation 189

The Essentials and Beyond 190

Chapter 10 Network Devices 193

Describing Device Functions 193

Understanding Repeaters 194

Understanding Hubs  194

Understanding Bridges  195

Understanding Switches 197

Understanding Routers  201

Understanding Wireless Access Points and Wireless Routers  205

Understanding Device Placement Principles 207

Defining Broadcast Domains 207

Defining Collision Domains 208

Understanding the Cisco Three-Layer Model  211

Essentials and Beyond  212

Chapter 11 LAN Operations 215

Understanding the Routing Process  215

Describing Routing Tables 216

Understanding Population Methods  219

Understanding Administrative Distance 221

Using Routing Protocols  223

Describing the Switching Process 232

Reviewing MAC and IP Addresses  233

Reviewing Contention Methods 234

Describing MAC Address Tables 235

Understanding Frame Forwarding  236

Describing End-to-End Communications 237

Understanding the Local LAN Process 237

Understanding the Remote Communication Process  238

Essentials and Beyond  239

Chapter 12 Managing the Cisco IOS 243

Describing Components 243

Defining the Contents of RAM  244

Defining the Contents of NVRAM 245

Defining the Contents of Flash 245

Defining the Contents of ROM  246

Describing IOS Navigation 248

Connecting to the Device  248

Accessing User, Privileged, and Global Configuration Modes  252

Understanding and Managing the Boot Process 256

Understanding the Boot Process 257

Managing the IOS  260

Understanding Configuration Files 261

Managing the Configuration Register 263

The Essentials and Beyond 266

Chapter 13 Configuring Routers 271

Cabling the Router  271

Cabling Router to Router 274

Cabling Router to Switch 276

Cabling PC to Router 277

Cabling Router to CSU/DSU  279

Creating a Console Session  280

Connecting with the Console Cable  280

Connecting through Telnet 281

Handling Initial Setup 282

Configuring Passwords 282

Interpreting Prompts 282

Configuring Privileged (Enable) Passwords 283

Configuring Enable Secret Passwords  284

Configuring Line Passwords  284

Configuring Interfaces  286

Accessing Interface Mode  286

Assigning an IP Address 287

Enabling the Interface 288

Verifying the Interface 288

Enabling DHCP  290

Configuring WAN Interfaces 292

Saving Configuration Changes 294

The Essentials and Beyond 295

Chapter 14 Conf iguring Switches 299

Cabling the Switch  299

Cabling Switch to Switch 300

Cabling Router to Switch 301

Cabling Hosts to Switch 302

Creating a Session with the Switch 302

Creating a Session with the Console Cable 303

Creating a Session through Telnet  304

Configuring Passwords 305

Configuring Privileged (Enable) Passwords 305

Configuring Enable Secret Passwords  306

Configuring Line Passwords  306

Configuring Interfaces  306

Accessing Switchports and Using Switchport Mode 306

Enabling the Port  307

Verifying the Port 307

Understanding Advanced Switch Functions  308

Understanding VLANs  308

Understanding Trunk Ports 310

Describing STP 311

The Essentials and Beyond 315

Chapter 15 Conf iguring Static Routing 317

Populating the Routing Table 318

Using the ip route Command  318

Verifying the Route Table 320

Configuring Inter-VLAN Routing 321

Creating a Trunk Link with Encapsulation  322

Creating and Configuring Subinterfaces  323

The Essentials and Beyond 325

Chapter 16 Configuring Dynamic Routing 331

Understanding Routing Protocols  331

Exploring RIP 333

Exploring EIGRP  335

Exploring OSPF  336

Configuring Routing Protocols  336

Enabling a Routing Protocol and Accessing Router Mode 337

Defining the Interfaces on Which the Protocol Is Operational 338

Verifying the Routing Table 340

Appendix Answers to Review Questions 349

Index 359