Understanding Cisco Networking Technologies, Volume 1

TODD LAMMLE, Cisco certified in almost every category, is the authority on Cisco networking and certification. His three decades of real-world experience is prevalent in his writing. He is an experienced networking engineer with very practical experience working on the largest bounded and unbounded networks in the world at such companies as Xerox, Hughes Aircraft, Texaco, AAA, Cisco, and Toshiba, among many others. Todd has published over 60 books, including the very popular and bestselling CCNA Cisco Certified Network Associate Study Guide and Cisco Firepower NGIPS. Todd runs an international training company from Texas, and a large-scale consulting business out of Colorado. You can reach Todd through his web site at www.lammle.com/ccna.

• Introduction xviiChapter 1 Internetworking 1Internetworking Basics 2Internetworking Models 10The Layered Approach 11Advantages of Reference Models 12The OSI Reference Model 12The Application Layer 14The Presentation Layer 15The Session Layer 16The Transport Layer 16The Network Layer 21The Data Link Layer 23The Physical Layer 26Summary 29Chapter 2 Ethernet Networking and Data Encapsulation 31Ethernet Networks in Review 32Collision Domain 32Broadcast Domain 34CSMA/CD 35Half- and Full-Duplex Ethernet 36Ethernet at the Data Link Layer 38Ethernet at the Physical Layer 45Ethernet Cabling 48Straight-Through Cable 49Crossover Cable 49Rolled Cable 51Fiber Optic 53Data Encapsulation 55The Cisco Three-Layer Hierarchical Model 59The Core Layer 60The Distribution Layer 60The Access Layer 61Summary 61Chapter 3 Introduction to TCP/IP 63Introducing TCP/IP 64A Brief History of TCP/IP 64TCP/IP and the DoD Model 65The Process/Application Layer Protocols 66The Host-to-Host or Transport Layer Protocols 76The Internet Layer Protocols 85IP Addressing 93IP Terminology 94The Hierarchical IP Addressing Scheme 94Private IP Addresses (RFC 1918) 99IPv4 Address Types 101Layer 2 Broadcasts 101Layer 3 Broadcasts 102Unicast Address 102Multicast Address 103Summary 104Chapter 4 Easy Subnetting 105Subnetting Basics 106How to Create Subnets 107Subnet Masks 108Classless Inter-Domain Routing (CIDR) 109IP Subnet-Zero 111Subnetting Class C Addresses 112Subnetting Class B Addresses 123Summary 131Chapter 5 Troubleshooting IP Addressing 133Cisco’s Way of Troubleshooting IP 134Determining IP Address Problems 137Summary 141Chapter 6 Cisco’s Internetworking Operating System (IOS) 143The IOS User Interface 144Cisco IOS 144Connecting to a Cisco IOS Device 145Bringing Up a Switch 147Command-Line Interface (CLI) 147Entering the CLI 148Overview of Router Modes 148CLI Prompts 149Editing and Help Features 151Administrative Configurations 156Hostnames 157Banners 157Setting Passwords 159Encrypting Your Passwords 165Descriptions 166Router and Switch Interfaces 169Bringing Up an Interface 172Viewing, Saving, and Erasing Configurations 177Deleting the Configuration and Reloading the Device 179Verifying Your Configuration 179Summary 192Chapter 7 Managing a Cisco Internetwork 193The Internal Components of a Cisco Router and Switch 194The Router and Switch Boot Sequence 195Backing Up and Restoring the Cisco Configuration 196Backing Up the Cisco Configuration 197Restoring the Cisco Configuration 199Erasing the Configuration 199Configuring DHCP 200DHCP Relay 202Verifying DHCP on Cisco IOS 202Using Telnet 203Telnetting into Multiple Devices Simultaneously 205Checking Telnet Connections 205Checking Telnet Users 206Closing Telnet Sessions 206Resolving Hostnames 206Building a Host Table 207Using DNS to Resolve Names 208Checking Network Connectivity and Troubleshooting 210Using the ping Command 210Using the traceroute Command 211Debugging 212Using the show processes Command 215Summary 215Chapter 8 Managing Cisco Devices 217Managing the Configuration Register 218Understanding the Configuration Register Bits 218Checking the Current Configuration Register Value 220Boot System Commands 221Recovering Passwords 222Backing Up and Restoring the Cisco IOS 224Verifying Flash Memory 226Backing Up the Cisco IOS 227Restoring or Upgrading the Cisco Router IOS 227Using the Cisco IOS File System (Cisco IFS) 230Licensing 235Right-To-Use Licenses (Evaluation Licenses) 237Backing Up and Uninstalling the License 240Summary 241Chapter 9 IP Routing 243Routing Basics 245The IP Routing Process 247The Cisco Router Internal Process 253Testing Your IP Routing Understanding 254Configuring IP Routing 258Corp Configuration 259SF Configuration 261LA Configuration 265Configuring IP Routing in Our Network 267Static Routing 268Default Routing 273Dynamic Routing 276Routing Protocol Basics 276Routing Information Protocol (RIP) 278Configuring RIP Routing 279Holding Down RIP Propagations 282Summary 284Chapter 10 Wide Area Networks 287Introduction to Wide Area Networks 288WAN Topology Options 289Defining WAN Terms 291WAN Connection Bandwidth 292WAN Connection Types 293WAN Support 294Cabling the Serial Wide Area Network 297Serial Transmission 297Data Terminal Equipment and Data Communication Equipment 298High-Level Data-Link Control (HDLC) Protocol 299Point-to-Point Protocol (PPP) 301Link Control Protocol (LCP) Configuration Options 303PPP Session Establishment 303PPP Authentication Methods 304Configuring PPP on Cisco Routers 304Configuring PPP Authentication 305Verifying and Troubleshooting Serial Links 305Multilink PPP (MLP) 311PPP Client (PPPoE) 314Configuring a PPPoE client 315Summary 316Glossary 317Index 365