Cisco Ccent/CCNA Icnd1 100-101 Official Cert Guide (ISBN: 9781587143854)

Cisco Ccent/CCNA Icnd1 100-101 Official Cert Guide (ISBN: 9781587143854)

Cisco Ccent/CCNA Icnd1 100-101 Official Cert Guide (ISBN: 9781587143854)

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Wendell Odom, CCIE No. 1624, has been in the networking industry since 1981. He has worked as a network engineer, consultant, systems engineer, instructor, and course developer; he currently works writing and creating certification tools. He is author of all the previous books in the Cisco Press CCNA Official Certification Guide series, as well as the "CCNP ROUTE"" 642-902 Official Certification Guide, " the "QoS 642-642 Exam Certification Guide, " coauthor of the "CCIE Routing and Switch Official Certification Guide, " and several other titles. He is also a consultant for the CCNA 640-802 Network Simulator from Pearson and for a forthcoming replacement version of that product. He maintains study tools, links to his blogs, and other resources at www. certskills. com. Table of Contents: Introduction xxxiGetting Started 3Part I: Networking Fundamentals 12Chapter 1 The TCP/IP and OSI Networking Models 15"Do I Know This Already?" Quiz 15Foundation Topics 18Perspectives on Networking 18TCP/IP Networking Model 19 History Leading to TCP/IP 20 Overview of the TCP/IP Networking Model 21 TCP/IP Application Layer 23 HTTP Overview 23 HTTP Protocol Mechanisms 24 TCP/IP Transport Layer 25 TCP Error Recovery Basics 25 Same-Layer and Adjacent-Layer Interactions 26 TCP/IP Network Layer 26 Internet Protocol and the Postal Service 27 Internet Protocol Addressing Basics 28 IP Routing Basics 29 TCP/IP Link Layer (Data Link Plus Physical) 30 TCP/IP Model and Terminology 32 Comparing the Original and Modern TCP/IP Models 32 Data Encapsulation Terminology 32 Names of TCP/IP Messages 34OSI Networking Model 34 Comparing OSI and TCP/IP 34 Describing Protocols by Referencing the OSI Layers 35 OSI Layers and Their Functions 36 OSI Layering Concepts and Benefits 37 OSI Encapsulation Terminology 38Exam Preparation Tasks 40Chapter 2 Fundamentals of Ethernet LANs 43"Do I Know This Already?" Quiz 43Foundation Topics 46An Overview of LANs 46 Typical SOHO LANs 46 Typical Enterprise LANs 47 The Variety of Ethernet Physical Layer Standards 48 Consistent Behavior over All Links Using the Ethernet Data Link Layer 49Building Physical Ethernet Networks with UTP 50 Transmitting Data Using Twisted Pairs 50 Breaking Down a UTP Ethernet Link 51 UTP Cabling Pinouts for 10BASE-T and 100BASE-T 53 Straight-Through Cable Pinout 54 Crossover Cable Pinout 55 Choosing the Right Cable Pinouts 56 UTP Cabling Pinouts for 1000BASE-T 57Sending Data in Ethernet Networks 57 Ethernet Data Link Protocols 58 Ethernet Addressing 59 Identifying Network Layer Protocols with the Ethernet Type Field 60 Error Detection with FCS 61 Sending Ethernet Frames with Switches and Hubs 62 Sending in Modern Ethernet LANs Using Full-Duplex 62 Using Half-Duplex with LAN Hubs 63Exam Preparation Tasks 65Chapter 3 Fundamentals of WANs 67"Do I Know This Already?" Quiz 67Foundation Topics 70Leased Line WANs 70 Positioning Leased Lines with LANs and Routers 70 Physical Details of Leased Lines 71 Leased Line Cabling 72 Building a WAN Link in a Lab 73 Data Link Details of Leased Lines 74 HDLC Basics 74 How Routers Use a WAN Data Link 75Ethernet as a WAN Technology 77 Ethernet WANs that Create a Layer 2 Service 78 How Routers Route IP Packets Using Ethernet Emulation 79Accessing the Internet 80 The Internet as a Large WAN 80 Internet Access (WAN) Links 81 Digital Subscriber Line 82 Cable Internet 84Exam Preparation Tasks 86Chapter 4 Fundamentals of IPv4 Addressing and Routing 89"Do I Know This Already?" Quiz 89Foundation Topics 92Overview of Network Layer Functions 92 Network Layer Routing (Forwarding) Logic 92 Host Forwarding Logic: Send the Packet to the Default Router 93 R1 and R2's Logic: Routing Data Across the Network 94 R3's Logic: Delivering Data to the End Destination 94 How Network Layer Routing Uses LANs and WANs 94 IP Addressing and How Addressing Helps IP Routing 95 Routing Protocols 97IPv4 Addressing 97 Rules for IP Addresses 98 Rules for Grouping IP Addresses 98 Class A, B, and C IP Networks 99 The Actual Class A, B, and C IP Networks 101 IP Subnetting 103IPv4 Routing 105IPv4 Host Routing 105 Router Forwarding Decisions and the IP Routing Table 106 A Summary of Router Forwarding Logic 106 A Detailed Routing Example 107IPv4 Routing Protocols 109Other Network Layer Features 111 Using Names and the Domain Name System 111 The Address Resolution Protocol 112 ICMP Echo and the ping Command 113Exam Preparation Tasks 115Chapter 5 Fundamentals of TCP/IP Transport and Applications 117"Do I Know This Already?" Quiz 117Foundation Topics 120TCP/IP Layer 4 Protocols: TCP and UDP 120 Transmission Control Protocol 121 Multiplexing Using TCP Port Numbers 122 Popular TCP/IP Applications 125 Connection Establishment and Termination 126 User Datagram Protocol 127TCP/IP Applications 128 QoS Needs and the Impact of TCP/IP Applications 128 Defining Interactive and Batch Applications 129 Real-Time Voice and Video Applications 129 The World Wide Web, HTTP, and SSL 130 Uniform Resource Locators 131 Finding the Web Server Using DNS 131 Transferring Files with HTTP 133Exam Preparation Tasks 135Part I Review 136Part II: Ethernet LANs and Switches 140Chapter 6 Building Ethernet LANs with Switches 143"Do I Know This Already?" Quiz 143Foundation Topics 146LAN Switching Concepts 146 Historical Progression: Hubs, Bridges, and Switches 146 Switching Logic 148 The Forward-Versus-Filter Decision 149 How Switches Learn MAC Addresses 150 Flooding Frames 151 Avoiding Loops Using Spanning Tree Protocol 152 Internal Processing on Cisco Switches 153 LAN Switching Summary 154Design Choices in Ethernet LANs 155 Collision Domains, Broadcast Domains, and VLANs 155 Collision Domains 155 Broadcast Domains 156 The Impact of Collision and Broadcast Domains on LAN Design 157 Virtual LANs (VLAN) 158 Choosing Ethernet Technology for a Campus LAN 159 Campus Design Terminology 160 Ethernet LAN Media and Cable Lengths 161 Autonegotiation 162 Autonegotiation Results When Only One Node Uses Autonegotiation 164 Autonegotiation and LAN Hubs 165Exam Preparation Tasks 166Chapter 7 Installing and Operating Cisco LAN Switches 169"Do I Know This Already?" Quiz 169Foundation Topics 172Accessing the Cisco Catalyst 2960 Switch CLI 172 Cisco Catalyst Switches and the 2960 Switch 172 Switch Status from LEDs 173 Accessing the Cisco IOS CLI 176 Cabling the Console Connection 176 Configuring the Terminal Emulator for the Console 177 Accessing the CLI with Telnet and SSH 179 Password Security for CLI Access 179 User and Enable (Privileged) Modes 180 CLI Help Features 182 The debugand showCommands 184Configuring Cisco IOS Software 185 Configuration Submodes and Contexts 185 Storing Switch Configuration Files 187 Copying and Erasing Configuration Files 190 Initial Configuration (Setup Mode) 191 IOS Version and Other Reload Facts 192Exam Preparation Tasks 195Review All the Key Topics 195Chapter 8 Configuring Ethernet Switching 199"Do I Know This Already?" Quiz 199Foundation Topics 202Configuration of Features in Common with Routers 202 Securing the Switch CLI 202 Securing Access with Simple Passwords 203 Securing Access with Local Usernames and Passwords 206 Securing Access with External Authentication Servers 207 Configuring Secure Shell (SSH) 207 Encrypting and Hiding Passwords 210 Encrypting Passwords with the service password Command 210 Hiding the Enable Password 212 Hiding the Passwords for Local Usernames 214 Console and vty Settings 214 Banners 214 History Buffer Commands 216 The logging synchronous and exec-timeout Commands 216LAN Switch Configuration and Operation 217 Enabling IP for Remote Access 217 Configuring IPv4 on a Switch 219 Verifying IPv4 on a Switch 220 Configuring Switch Interfaces 221 Port Security 223 Configuring Port Security 224 Verifying Port Security 226 Port Security Actions 227 Securing Unused Switch Interfaces 228Exam Preparation Tasks 229Chapter 9 Implementing Ethernet Virtual LANs 235"Do I Know This Already?" Quiz 235Foundation Topics 238Virtual LAN Concepts 238 Creating Multiswitch VLANs Using Trunking 239 VLAN Tagging Concepts 240 The 802.1Q and ISL VLAN Trunking Protocols 241 Forwarding Data Between VLANs 242 Routing Packets Between VLANs with a Router 243 Routing Packets with a Layer 3 Switch 245VLAN and VLAN Trunking Configuration and Verification 246 Creating VLANs and Assigning Access VLANs to an Interface 246 VLAN Configuration Example 1: Full VLAN Configuration 247 VLAN Configuration Example 2: Shorter VLAN Configuration 250 VLAN Trunking Protocol (VTP) 251 VLAN Trunking Configuration 252 Controlling Which VLANs Can Be Supported on a Trunk 257Exam Preparation Tasks 260Chapter 10 Troubleshooting Ethernet LANs 265"Do I Know This Already?" Quiz 265Foundation Topics 269 Perspectives on Network Verification and Troubleshooting 269 Preparing to Use an Organized Troubleshooting Process 269 Troubleshooting as Covered in This Book 272Analyzing LAN Topology Using Cisco Discovery Protocol 272 Examining Information Learned by CDP 273 Examining the Status of the CDP Protocols 276Analyzing Switch Interface Status 277 Interface Status Codes and Reasons for Nonworking States 277 Interface Speed and Duplex Issues 279 Common Layer 1 Problems on Working Interfaces 282Predicting Where Switches Will Forward Frames 284 Predicting the Contents of the MAC Address Table 284 Analyzing the Forwarding Path 286 Port Security and Filtering 287Analyzing VLANs and VLAN Trunks 288 Ensuring That the Right Access Interfaces Are in the Right VLANs 288 Access VLANs Not Being Defined 289 Access VLANs Being Disabled 290 Check the Allowed VLAN List on Both Ends of a Trunk 291 Mismatched Trunking Operational States 292Exam Preparation Tasks 294Part II Review 298Part III: IP Version 4 Addressing and Subnetting 302Chapter 11 Perspectives on IPv4 Subnetting 305"Do I Know This Already?" Quiz 305Foundation Topics 308Introduction to Subnetting 308 Subnetting Defined Through a Simple Example 308 Operational View Versus Design View of Subnetting 309Analyze Subnetting and Addressing Needs 310 Rules About Which Hosts Are in Which Subnet 310 Determining the Number of Subnets 311 Determining the Number of Hosts per Subnet 313 One Size Subnet Fits All-Or Not 314 Defining the Size of a Subnet 314 One Size Subnet Fits All 315 Multiple Subnet Sizes (Variable-Length Subnet Masks) 316 This Book: One Size Subnet Fits All (Mostly) 316Make Design Choices 317 Choose a Classful Network 317 Public IP Networks 317 Growth Exhausts the Public IP Address Space 318 Private IP Networks 319 Choosing an IP Network During the Design Phase 320 Choose the Mask 320 Classful IP Networks Before Subnetting 321 Borrowing Host Bits to Create Subnet Bits 321 Choosing Enough Subnet and Host Bits 322 Example Design: 172.16. 0.0, 200 Subnets, 200 Hosts 323 Masks and Mask Formats 324 Build a List of All Subnets 325Plan the Implementation 326 Assigning Subnets to Different Locations 327 Choose Static and Dynamic Ranges per Subnet 328Exam Preparation Tasks 329Chapter 12 Analyzing Classful IPv4 Networks 331"Do I Know This Already?" Quiz 331Foundation Topics 334Classful Network Concepts 334 IPv4 Network Classes and Related Facts 334 Actual Class A, B, and C Networks 335 Address Formats 336 Default Masks 337 Number of Hosts per Network 337 Deriving the Network ID and Related Numbers 338 Unusual Network IDs and Network Broadcast Addresses 340Practice with Classful Networks 341 Practice Deriving Key Facts Based on an IP Address 341 Practice Remembering the Details of Address Classes 342 Additional Practice 343Exam Preparation Tasks 344Answers to Earlier Practice Problems 345Chapter 13 Analyzing Subnet Masks 349"Do I Know This Already?" Quiz 349Foundation Topics 352Subnet Mask Conversion 352 Three Mask Formats 352 Converting Between Binary and Prefix Masks 353 Converting Between Binary and DDN Masks 354 Converting Between Prefix and DDN Masks 356 Practice Converting Subnet Masks 357Identifying Subnet Design Choices Using Masks 358 Masks Divide the Subnet's Addresses into Two Parts 359 Masks and Class Divide Addresses into Three Parts 360 Classless and Classful Addressing 361 Calculations Based on the IPv4 Address Format 361 Practice Analyzing Subnet Masks 363Exam Preparation Tasks 365Answers to Earlier Practice Problems 366Chapter 14 Analyzing Existing Subnets 369"Do I Know This Already?" Quiz 369Foundation Topics 372Defining a Subnet 372 An Example with Network 172.16. 0.0 and Four Subnets 372 Subnet ID Concepts 374 Subnet Broadcast Address 375 Range of Usable Addresses 375Analyzing Existing Subnets: Binary 376 Finding the Subnet ID: Binary 376 Finding the Subnet Broadcast Address: Binary 378 Binary Practice Problems 379 Shortcut for the Binary Process 380 Brief Note About Boolean Math 382 Finding the Range of Addresses 382Analyzing Existing Subnets: Decimal 382 Analysis with Easy Masks 383 Predictability in the Interesting Octet 384 Finding the Subnet ID: Difficult Masks 385 Resident Subnet Example 1 386 Resident Subnet Example 2 387 Resident Subnet Practice Problems 387 Fi
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