Introduction . 1 Taking a Certification Exam . 2 Tracking Your Certification Status . 3 How to Prepare for an Exam . 4 What This Book Will Not Do . 5 What This Book Is Designed to Do . 5 About This Book . 6 CCENT Official Exam Topics .

6 Chapter Formats . 12 Pearson IT Certification Practice Test Engine and Questions on the CD-ROM . 14 Install the Software from the CD . 14 Activate and Download the Practice Exam . 15 Activating Other Exams . 16 Contacting the Authors . 16 Self-Assessment . 17 CCENT in the Real World .

17 The Ideal CCENT Candidate . 18 Put Yourself to the Test . 19 CHAPTER 1: Networking Fundamentals . 25 Essential Terms and Components . 26 Topologies . 27 Ethernet . 28 WAN Technologies . 31 Review Questions .

34 Answers to Review Questions . 36 What Next? . 37 CHAPTER 2: Network Models . 39 Cisco Hierarchical Design . 40 Access Layer . 40 Distribution Layer . 41 Core Layer . 41 Advantages of the Three-Layer Model .

42 OSI Model . 44 Layer 7: The Application Layer . 45 Layer 6: The Presentation Layer . 47 Layer 5: The Session Layer . 47 Layer 4: The Transport Layer . 47 Layer 3: The Network Layer . 54 Layer 2: The Data Link Layer . 56 Layer 1: The Physical Layer .

57 TCP/IP Model . 61 Review Questions . 64 Answers to Review Questions . 67 CHAPTER 3: Concepts in IP Addressing . 69 Binary . 70 Hexadecimal . 74 Conversion Between Binary, Hex, and Decimal . 75 Decimal to Hexadecimal Conversions .

75 Hexadecimal to Decimal Conversions . 75 IP Address Components . 77 Address Class . 77 Public and Private IP Addresses . 78 Default Subnet Mask . 78 The Network Field . 79 The Host Field . 80 Nondefault Masks .

80 The Subnet Field . 81 Subnetting . 82 Address Class and Default Mask . 83 The Increment . 84 Number of Hosts . 86 The Broadcast ID . 88 Number of Subnets . 89 Working with Subnetting Questions .

91 The Subnetting Chart . 93 VLSM . 96 Route Summarization . 100 Summarization Guidelines . 102 Determining Summary Addresses . 104 IPv6 . 110 IPv6 Address Allocation . 112 IPv6 Address Notation .

113 Types of IPv6 Addresses . 114 IPv6 Address Configuration . 115 IPv6 Router Configuration . 116 IPv6 Features . 117 The IPv6 Header . 118 IPv6 Transition Strategies . 119 Review Questions . 122 Answers to Review Questions .

128 What Next? . 131 CHAPTER 4: Working with Cisco Equipment. 133 Introducing Your Cisco Gear . 134 External Connections . 135 Other Connections . 139 Connecting and Configuring Cisco Devices . 141 Device Memory Locations . 142 IOS Startup Process .

142 Setup Mode . 144 Configuration Register . 144 Password Recovery . 145 Command-Line Modes . 146 Command Shortcuts . 148 Context-Sensitive Help . 149 Managing IOS Licensing . 150 Remote Management .

152 Telnet . 152 Secure Shell . 154 Cisco Discovery Protocol . 155 Internet Control Message Protocol . 156 Network Time Protocol . 158 Simple Network Management Protocol. 158 Syslog . 159 NetFlow .

159 Basic Switch Configuration . 159 Basic Router Configuration . 160 Review Questions . 164 Answers to Review Questions . 166 What Next? . 167 CHAPTER 5: Securing Your Cisco Devices . 169 Securing Routers and Switches . 170 Configuring Password Security .

170 Configuring SSH Access to Your Router . 174 External Authentication Methods . 176 Switch Port Security . 178 Security Best Practices for Switches . 178 Review Questions . 184 Answers to Review Questions . 186 What Next? . 187 CHAPTER 6: Basic Switch Operations and Configuration .

189 Bridging and Switching . 190 Functions of Bridges and Switches . 191 The Differences Between Switches and Bridges . 195 STP . 200 VLAN Concepts and Applications . 204 The Definition of a VLAN . 206 Benefits of VLANs . 206 Implementing VLANs .

208 VLAN Membership . 210 Trunking . 212 802.1Q . 214 Configuring Switches for Trunking . 215 Review Questions . 219 Answers to Review Questions . 222 What Next? .

224 CHAPTER 7: Basic Routing . 225 Routing Fundamentals . 226 The Next Hop Concept . 227 Connected Networks . 228 Static Routes . 229 Default Routes . 230 Dynamic Routes . 232 Understanding the Router Lookup Process and the IP Route Table .

235 Inter-VLAN Routing . 242 Router on a Stick . 243 L3 Switching . 245 OSPF . 248 Characteristics . 249 Configuring Single-Area OSPFv2. 254 Configuring Single-Area OSPFv3. 258 Verifying and Troubleshooting OSPF.

260 Verification of OSPFv3 . 261 Review Questions . 265 Answers to Review Questions . 269 CHAPTER 8: Visualizing Data Flow Between Two Hosts on a Network . 271 Host-to-Host Direct Communications . 272 Host to Host Through a Switch . 275 Host to Host Through a Router . 278 Review Questions .

283 Answers to Review Questions . 286 What Next? . 288 CHAPTER 9: IP Access Lists . 289 IP Access Lists as Packet Filters . 290 Types of ACLs . 293 Configuring and Implementing . 296 Configuring Standard ACLs . 297 Configuring Extended ACLs .

300 Filtering Telnet and SSH Access . 302 Troubleshooting and Verifying ACL Configurations. 308