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Switched Networks Companion Guide

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9781587133299

ISBN10:
1587133296
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Pub. Date:
5/16/2014
Publisher(s):
Cisco Press
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Summary

Switched Networks Companion Guide is the official supplemental textbook for the Switched Networks course in the Cisco® Networking Academy® CCNA® Routing and Switching curriculum.

 

This course describes the architecture, components, and operations of a converged switched network. You will learn about the hierarchical network design model and how to configure a switch for basic and advanced functionality. By the end of this course, you will be able to troubleshoot and resolve common issues with Virtual LANs and inter-VLAN routing in a converged network. You will also develop the knowledge and skills needed to implement a WLAN in a small-to-medium network.

 

The Companion Guide is designed as a portable desk reference to use anytime, anywhere to reinforce the material from the course and organize your time.

 

The book’s features help you focus on important concepts to succeed in this course:

 

  • Chapter objectives–Review core concepts by answering the focus questions listed at the beginning of each chapter.
  • Key terms–Refer to the lists of networking vocabulary introduced and highlighted in context in each chapter. 
  • Glossary–Consult the comprehensive Glossary more than 300 terms. 
  • Summary of Activities and Labs–Maximize your study time with this complete list of all associated practice exercises at the end of each chapter. 
  • Check Your Understanding–Evaluate your readiness with the end-of-chapter questions that match the style of questions you see in the online course quizzes. The answer key explains each answer.

 

Related Title:

Switched Networks Lab Manual

ISBN-10: 1-58713-327-X

ISBN-13: 978-1-58713-327-5

 

  • How To–Look for this icon to study the steps you need to learn to perform certain tasks.
  • Interactive Activities–Reinforce your understanding of topics with all the different exercises from the online course identified throughout the book with this icon.
  • Videos–Watch the videos embedded within the online course.
  • Packet Tracer Activities–Explore and visualize networking concepts using Packet Tracer exercises interspersed throughout the chapters.
  • Hands-on Labs–Work through all the course labs and Class Activities that are included in the course and published in the separate Lab Manual.

 

 

Author Biography

Erich Spengler is the Director for the Center for System Security and Information Assurance, based at Moraine Valley CC. Erich is a Professor of Computer Integrated Technologies at Moraine Valley and has been teaching Cisco Academy courses for over 15 years. Erich is an ITQ-certified instructor for Cisco Academy. Erich is an active CISSP and has helped dozens of others earn the CISSP designation.

 

Erich has over 25 years of professional experience in IT systems and security. Erich’s Center has trained over 1000 faculty since 2003 in VMware, CyberSecurity, Cisco, EMC, and Linux.

 

In his downtime, Erich enjoys spending time with his wife and two daughters.

 

Wayne Lewis wears three hats: Cisco Academy Manager for the Pacific Center for Advanced Technology Training, NetAcad Contact for the Central Pacific Academy Support and Instructor Training Center, and Professor at Honolulu Community College. Okay . . . four hats: Wayne teaches calculus, linear algebra, and differential equations at the University of Hawaii at Manoa.

 

Honolulu CC has been an instructor training center for Cisco Academy since 1998, and its instructors are responsible for training many of the initial cohorts of Cisco Academy instructors in countries throughout Asia, Europe, and the Americas. Wayne has been involved in curriculum development and assessment for Cisco Academy since 1999.

 

Wayne spends his free time doing math (representation theory, algebraic geometry, and several complex variables) and watching marathon sessions of TV series with his family (their favorites to rewatch are South Park, The Office, Monty Python, and Lost).

Table of Contents

Introduction xix

Chapter 1 Introduction to Switched Networks 1

Objectives 1

Key Terms 1

Introduction (1.0.1.1) 2

LAN Design (1.1) 3

    Converged Networks (1.1.1) 3

        Growing Complexity of Networks (1.1.1.1) 3

        Elements of a Converged Network (1.1.1.2) 5

        Cisco Borderless Network (1.1.1.3) 6

        Hierarchy in the Borderless Switched Network (1.1.1.4) 7

        Access, Distribution, and Core Layers (1.1.1.5) 9

    Switched Networks (1.1.2) 11

        Role of Switched Networks (1.1.2.1) 12

        Form Factors (1.1.2.2) 13

        Traffic Flow (1.1.2.3) 15

        Multilayer Switching (1.1.2.4) 16

    Switch Features (1.1.3) 17

        Port Density (1.1.3.1) 17

        Forwarding Rates (1.1.3.2) 19

        Power over Ethernet (1.1.3.3) 19

        Cisco Catalyst Switch Breakdown (1.1.3.4) 21

The Switched Environment (1.2) 23

    Frame Forwarding (1.2.1) 23

        Switching as a General Concept in Networking and Telecommunications (1.2.1.1) 23

        Dynamically Populating a Switch MAC Address Table (1.2.1.2) 25

        Switch Forwarding Methods (1.2.1.3) 28

        Store-and-Forward Switching (1.2.1.4) 29

        Cut-Through Switching (1.2.1.5) 30

    Switching Domains (1.2.2) 31

        Collision Domains (1.2.2.1) 32

        Broadcast Domains (1.2.2.2) 32

        Alleviating Network Congestion (1.2.2.3) 33

Summary (1.3) 35

Practice 37

    Class Activities 37

    Labs 37

    Packet Tracer Activities 37

Check Your Understanding Questions 37

Chapter 2 Basic Switching Concepts and Configuration 41

Objectives 41

Key Terms 41

Introduction (2.0.1.1) 42

Basic Switch Configuration (2.1) 43

    Configure a Switch with Initial Settings (2.1.1) 43

        Switch Boot Sequence (2.1.1.1) 43

        Recovering From a System Crash (2.1.1.2) 44

        Switch LED Indicators (2.1.1.3) 45

        Preparing for Basic Switch Management (2.1.1.4) 47

        Configuring Basic Switch Management Access with IPv4 (2.1.1.5) 47

    Configure Switch Ports (2.1.2) 50

        Duplex Communication (2.1.2.1) 50

        Configure Switch Ports at the Physical Layer (2.1.2.2) 51

        Auto-MDIX (2.1.2.3) 52

        Verifying Switch Port Configuration (2.1.2.4) 53

        Network Access Layer Issues (2.1.2.5) 55

        Troubleshooting Network Access Layer Issues (2.1.2.6) 58

Switch Security: Management and Implementation (2.2) 59

    Secure Remote Access (2.2.1) 60

        SSH Operation (2.2.1.1) 60

        Configuring SSH (2.2.1.2) 62

        Verifying SSH (2.2.1.3) 64

    Security Concerns in LANs (2.2.2) 66

        Common Security Attacks: MAC Address Flooding (2.2.2.1) 66

        Common Security Attacks: DHCP Spoofing (2.2.2.2) 69

        Common Security Attacks: Leveraging CDP (2.2.2.3) 70

    Security Best Practices (2.2.3) 72

        Best Practices (2.2.3.1) 72

        Network Security Tools and Testing (2.2.3.2) 73

        Network Security Audits (2.2.3.3) 74

    Switch Port Security (2.2.4) 74

        Secure Unused Ports (2.2.4.1) 74

        DHCP Snooping (2.2.4.2) 75

        Port Security: Operation (2.2.4.3) 77

        Port Security: Violation Modes (2.2.4.4) 78

        Port Security: Configuring (2.2.4.5) 80

        Port Security: Verifying (2.2.4.6) 81

        Ports in Error-Disabled State (2.2.4.7) 83

        Network Time Protocol (NTP) (2.2.4.8) 85

Summary (2.3) 88

Practice 90

    Class Activities 90

    Labs 90

    Packet Tracer Activities 90

Check Your Understanding Questions 91

Chapter 3 VLANs 95

Objectives 95

Key Terms 95

Introduction (3.0.1.1) 96

VLAN Segmentation (3.1) 97

    Overview of VLANs (3.1.1) 97

        VLAN Definitions (3.1.1.1) 97

        Benefits of VLANs (3.1.1.2) 98

        Types of VLANs (3.1.1.3) 99

        Voice VLANs (3.1.1.4) 101

    VLANs in a Multiswitch Environment (3.1.2) 102

        VLAN Trunks (3.1.2.1) 102

        Controlling Broadcast Domains with VLANs (3.1.2.2) 103

        Tagging Ethernet Frames for VLAN Identification (3.1.2.3) 105

        Native VLANs and 802.1Q Tagging (3.1.2.4) 106

        Voice VLAN Tagging (3.1.2.5) 107

VLAN Implementations (3.2) 109

    VLAN Assignment (3.2.1) 109

        VLAN Ranges on Catalyst Switches (3.2.1.1) 110

        Creating a VLAN (3.2.1.2) 111

        Assigning Ports to VLANs (3.2.1.3) 112

        Changing VLAN Port Membership (3.2.1.4) 113

        Deleting VLANs (3.2.1.5) 116

        Verifying VLAN Information (3.2.1.6) 117

    VLAN Trunks (3.2.2) 119

        Configuring IEEE 802.1Q Trunk Links (3.2.2.1) 119

        Resetting the Trunk to the Default State (3.2.2.2) 121

        Verifying Trunk Configuration (3.2.2.3) 123

    Dynamic Trunking Protocol (3.2.3) 124

        Introduction to DTP (3.2.3.1) 125

        Negotiated Interface Modes (3.2.3.2) 126

    Troubleshoot VLANs and Trunks (3.2.4) 128

        IP Addressing Issues with VLAN (3.2.4.1) 128

        Missing VLANs (3.2.4.2) 129

        Introduction to Troubleshooting Trunks (3.2.4.3) 131

        Common Problems with Trunks (3.2.4.4) 132

        Trunk Mode Mismatches (3.2.4.5) 133

        Incorrect VLAN List (3.2.4.6) 135

VLAN Security and Design (3.3) 138

    Attacks on VLANs (3.3.1) 138

        Switch Spoofing Attack (3.3.1.1) 138

        Double-Tagging Attack (3.3.1.2) 139

        PVLAN Edge (3.3.1.3) 140

    VLAN Best Practices (3.3.2) 142

        VLAN Design Guidelines (3.3.2.1) 142

Summary (3.4) 144

Practice 146

    Class Activities 146

    Labs 146

    Packet Tracer Activities 146

Check Your Understanding Questions 147

Chapter 4 LAN Redundancy 151

Objectives 151

Key Terms 151

Introduction (4.0.1.1) 153

Spanning Tree Concepts (4.1) 154

    STP Operation (4.1.2) 154

        Redundancy at OSI Layers 1 and 2 (4.1.1.1) 154

        Issues with Layer 1 Redundancy: MAC Database Instability (4.1.1.2) 156

        Issues with Layer 1 Redundancy: Broadcast Storms (4.1.1.3) 161

        Issues with Layer 1 Redundancy: Duplicate Unicast Frames (4.1.1.4) 161

    STP Operation (4.1.2) 162

        Spanning Tree Algorithm: Introduction (4.1.2.1) 162

        Spanning Tree Algorithm: Port Roles (4.1.2.2) 165

        Spanning Tree Algorithm: Root Bridge (4.1.2.3) 167

        Spanning Tree Algorithm: Path Cost (4.1.2.4) 168

        802.1D BPDU Frame Format (4.1.2.5) 171

        BPDU Propagation and Process (4.1.2.6) 173

        Extended System ID (4.1.2.7) 178

Varieties of Spanning Tree Protocols (4.2) 182

    Overview (4.2.1) 182

        List of Spanning Tree Protocols (4.2.1.1) 182

        Characteristics of the Spanning Tree Protocols (4.2.1.2) 183

    PVST+ (4.2.2) 185

        Overview of PVST+ (4.2.2.1) 185

        Port States and PVST+ Operation (4.2.2.2) 186

        Extended System ID and PVST+ Operation (4.2.2.3) 188

        Rapid PVST+ (4.2.3) 189

        Overview of Rapid PVST+ (4.2.3.1) 189

        RSTP BPDU (4.2.3.2) 190

        Edge Ports (4.2.3.3) 192

        Link Types (4.2.3.4) 192

Spanning Tree Configuration (4.3) 193

    PVST+ Configuration (4.3.1) 193

        Catalyst 2960 Default Configuration (4.3.1.1) 194

        Configuring and Verifying the Bridge ID (4.3.1.2) 194

        PortFast and BPDU Guard (4.3.1.3) 196

        PVST+ Load Balancing (4.3.1.4) 199

    Rapid PVST+ Configuration (4.3.2) 202

        Spanning Tree Mode (4.3.2.1) 202

    STP Configuration Issues (4.3.3) 205

        Analyzing the STP Topology (4.3.3.1) 205

        Expected Topology Versus Actual Topology (4.3.3.2) 206

        Overview of Spanning Tree Status (4.3.3.3) 207

        Spanning Tree Failure Consequences (4.3.3.4) 207

        Repairing a Spanning Tree Problem (4.3.3.5) 210

First Hop Redundancy Protocols (4.4) 210

    Concept of First Hop Redundancy Protocols (4.4.1) 211

        Default Gateway Limitations (4.4.1.1) 211

        Router Redundancy (4.4.1.2) 212

        Steps for Router Failover (4.4.1.3) 213

    Varieties of First Hop Redundancy Protocols (4.4.2) 214

        First Hop Redundancy Protocols (4.4.2.1) 214

    FHRP Verification (4.4.3) 215

        HSRP Verification (4.4.3.1) 216

        GLBP Verification (4.4.3.2) 217

Summary (4.5) 220

Practice 221

    Class Activities 221

    Labs 221

    Packet Tracer Activities 221

Check Your Understanding Questions 222

Chapter 5 Link Aggregation 227

Objectives 227

Key Terms 227

Introduction (5.0.1.1) 228

Link Aggregation Concepts (5.1) 228

    Link Aggregation (5.1.1) 229

        Introduction to Link Aggregation (5.1.1.1) 229

        Advantages of EtherChannel (5.1.1.2) 230

    EtherChannel Operation (5.1.2) 231

        Implementation Restrictions (5.1.2.1) 231

        Port Aggregation Protocol (5.1.2.2) 232

        Link Aggregation Control Protocol (5.1.2.3) 234

Link Aggregation Configuration (5.2) 235

    Configuring EtherChannel (5.2.1) 235

        Configuration Guidelines (5.2.1.1) 236

        Configuring Interfaces (5.2.1.2) 237

    Verifying and Troubleshooting EtherChannel (5.2.2) 238

        Verifying EtherChannel (5.2.2.1) 238

        Troubleshooting EtherChannel (5.2.2.2) 241

Summary (5.3) 245

Practice 246

    Class Activities 246

    Labs 246

    Packet Tracer Activities 246

Check Your Understanding Questions 247

Chapter 6 Inter-VLAN Routing 251

Objectives 251

Key Terms 251

Introduction (6.0.1.1) 252

Inter-VLAN Routing Configuration (6.1) 252

    Inter-VLAN Routing Operation (6.1.1) 253

        What Is Inter-VLAN Routing? (6.1.1.1) 253

        Legacy Inter-VLAN Routing (6.1.1.2) 254

        Router-on-a-Stick Inter-VLAN Routing (6.1.1.3) 255

        Multilayer Switch Inter-VLAN Routing (6.1.1.4) 256

    Configure Legacy Inter-VLAN Routing (6.1.2) 257

        Configure Legacy Inter-VLAN Routing: Preparation (6.1.2.1) 257

        Configure Legacy Inter-VLAN Routing: Switch Configuration (6.1.2.2) 259

        Configure Legacy Inter-VLAN Routing: Router Interface Configuration (6.1.2.3) 260

    Configure Router-on-a-Stick Inter-VLAN Routing (6.1.3) 262

        Configure Router-on-a-Stick: Preparation (6.1.3.1) 262

        Configure Router-on-a-Stick: Switch Configuration (6.1.3.2) 264

        Configure Router-on-a-Stick: Router Subinterface Configuration (6.1.3.3) 265

        Configure Router-on-a-Stick: Verifying Subinterfaces (6.1.3.4) 266

        Configure Router-on-a-Stick: Verifying Routing (6.1.3.5) 268

Troubleshoot Inter-VLAN Routing (6.2) 270

    Inter-VLAN Configuration Issues (6.2.1) 270

        Switch Port Issues (6.2.1.1) 270

        Verify Switch Configuration (6.2.1.2) 272

        Interface Issues (6.2.1.3) 273

        Verify Router Configuration (6.2.1.4) 274

    IP Addressing Issues (6.2.2) 276

        Errors with IP Addresses and Subnet Masks (6.2.2.1) 276

        Verifying IP Address and Subnet Mask Configuration

        Issues (6.2.2.2) 278

Layer 3 Switching (6.3) 280

    Layer 3 Switching Operation and Configuration (6.3.1) 280

        Introduction to Layer 3 Switching (6.3.1.1) 280

        Inter-VLAN Routing with Switch Virtual Interfaces (6.3.1.2) 282

        Inter-VLAN Routing with Routed Ports (6.3.1.4) 284

        Configuring Static Routes on a Catalyst 2960 Switch (6.3.1.5) 285

    Troubleshoot Layer 3 Switching (6.3.2) 291

        Layer 3 Switch Configuration Issues (6.3.2.1) 291

        Example: Troubleshooting Layer 3 Switching (6.3.2.2) 292

Summary (6.4) 295

Practice 296

    Class Activities 296

    Labs 296

    Packet Tracer Activities 296

Check Your Understanding Questions 297

Chapter 7 DHCP 303

Objectives 303

Key Terms 303

Introduction (7.0.1.1) 305

Dynamic Host Configuration Protocol v4 (7.1) 306

    DHCPv4 Operation (7.1.1) 306

        Introducing DHCPv4 (7.1.1.1) 306

        DHCPv4 Operation (7.1.1.2) 307

        DHCPv4 Message Format (7.1.1.3) 311

        DHCPv4 Discover and Offer Messages (7.1.1.4) 313

    Configuring a Basic DHCPv4 Server (7.1.2) 315

        Configuring a Basic DHCPv4 Server (7.1.2.1) 315

        Verifying DHCPv4 (7.1.2.2) 318

        DHCPv4 Relay (7.1.2.3) 322

    Configure DHCPv4 Client (7.1.3) 325

        Configuring a Router as DHCPv4 Client (7.1.3.1) 325

        Configuring a SOHO Router as a DHCPv4 Client (7.1.3.2) 326

    Troubleshoot DHCPv4 (7.1.4) 327

        Troubleshooting Tasks (7.1.4.1) 327

        Verify Router DHCPv4 Configuration (7.1.4.2) 329

        Debugging DHCPv4 (7.1.4.3) 330

Dynamic Host Configuration Protocol for IPv6 (DHCPv6) (7.2) 331

    SLAAC and DHCPv6 (7.2.1) 331

        Stateless Address Autoconfiguration (SLAAC) (7.2.1.1) 331

        SLAAC Operation (7.2.1.2) 333

        SLAAC and DHCPv6 (7.2.1.3) 335

        SLAAC Option (7.2.1.4) 336

        Stateless DHCPv6 Option (7.2.1.5) 337

        Stateful DHCPv6 Option (7.2.1.6) 338

        DHCPv6 Operations (7.2.1.7) 339

    Stateless DHCPv6 (7.2.2) 342

        Configuring a Router as a Stateless DHCPv6 Server (7.2.2.1) 342

        Configuring a Router as a Stateless DHCPv6 Client (7.2.2.2) 344

        Verifying Stateless DHCPv6 (7.2.2.3) 344

    Stateful DHCPv6 Server (7.2.3) 346

        Configuring a Router as a Stateful DHCPv6 Server (7.2.3.1) 346

        Configuring a Router as a Stateful DHCPv6 Client (7.2.3.2) 349

        Verifying Stateful DHCPv6 (7.2.3.3) 349

        Configuring a Router as a DHCPv6 Relay Agent (7.2.3.4) 351

    Troubleshoot DHCPv6 (7.2.4) 352

        Troubleshooting Tasks (7.2.4.1) 353

        Verify Router DHCPv6 Configuration (7.2.4.2) 354

        Debugging DHCPv6 (7.2.4.3) 355

Summary (7.3) 357

Practice 359

    Class Activities 359

    Labs 359

    Packet Tracer Activities 359

Check Your Understanding Questions 360

Chapter 8 Wireless LANs 363

Objectives 363

Key Terms 363

Introduction (8.0.1.1) 367

Wireless Concepts (8.1) 367

    Introduction to Wireless (8.1.1) 367

        Supporting Mobility (8.1.1.1) 368

        Benefits of Wireless (8.1.1.2) 368

        Wireless Technologies (8.1.1.3) 369

        Radio Frequencies (8.1.1.4) 370

        802.11 Standards (8.1.1.5) 371

        Wi-Fi Certification (8.1.1.6) 373

        Comparing WLANs to a LAN (8.1.1.7) 375

    Components of WLANs (8.1.2) 376

        Wireless NICs (8.1.2.1) 376

        Wireless Home Router (8.1.2.2) 377

        Business Wireless Solutions (8.1.2.3) 379

        Wireless Access Points (8.1.2.4) 380

        Small Wireless Deployment Solutions (8.1.2.5) 382

        Large Wireless Deployment Solutions (8.1.2.6) 385

        Large Wireless Deployment Solutions, Cont. (8.1.2.7) 387

        Wireless Antennas (8.1.2.8) 389

    802.11 WLAN Topologies (8.1.3) 391

        802.11 Wireless Topology Modes (8.1.3.1) 391

        Ad Hoc Mode (8.1.3.2) 392

        Infrastructure Mode (8.1.3.3) 393

Wireless LAN Operations (8.2) 395

    802.11 Frame Structure (8.2.1) 395

        Wireless 802.11 Frame (8.2.1.1) 395

        Frame Control Field (8.2.1.2) 397

        Wireless Frame Type (8.2.1.3) 399

        Management Frames (8.2.1.4) 400

        Control Frames (8.2.1.5) 402

    Wireless Operation (8.2.2) 403

        Carrier Sense Multiple Access with Collision Avoidance (8.2.2.1) 404

        Wireless Clients and Access Point Association (8.2.2.2) 405

        Association Parameters (8.2.2.3) 406

        Discovering APs (8.2.2.4) 409

        Authentication (8.2.2.5) 411

    Channel Management (8.2.3) 413

        Frequency Channel Saturation (8.2.3.1) 413

        Selecting Channels (8.2.3.2) 415

        Planning a WLAN Deployment (8.2.3.3) 418

Wireless LAN Security (8.3) 420

    WLAN Threats (8.3.1) 420

        Securing Wireless (8.3.1.1) 420

        DoS Attack (8.3.1.2) 422

        Management Frame DoS Attacks (8.3.1.3) 423

        Rogue Access Points (8.3.1.4) 425

        Man-in-the-Middle Attack (8.3.1.5) 426

    Securing WLANs (8.3.2) 428

        Wireless Security Overview (8.3.2.1) 428

        Shared Key Authentication Methods (8.3.2.2) 430

        Encryption Methods (8.3.2.3) 432

        Authenticating a Home User (8.3.2.4) 432

        Authentication in the Enterprise (8.3.2.5) 434

Wireless LAN Configuration (8.4) 435

    Configure a Wireless Router (8.4.1) 435

        Configuring a Wireless Router (8.4.1.1) 435

        Setting Up and Installing Initial Linksys EA6500 (8.4.1.2) 437

        Configuring the Linksys Smart Wi-Fi Home Page (8.4.1.3) 441

        Smart Wi-Fi Settings (8.4.1.4) 443

        Smart Wi-Fi Tools (8.4.1.5) 446

        Backing Up a Configuration (8.4.1.6) 450

    Configuring Wireless Clients (8.4.2) 452

        Connecting Wireless Clients (8.4.2.1) 452

    Troubleshoot WLAN Issues (8.4.3) 453

        Troubleshooting Approaches (8.4.3.1) 453

        Wireless Client Not Connecting (8.4.3.2) 455

        Troubleshooting When the Network Is Slow (8.4.3.3) 456

        Updating Firmware (8.4.3.4) 458

Summary (8.5) 460

Practice 461

    Class Activities 461

    Labs 462

    Packet Tracer Activities 462

Check Your Understanding Questions 462

Appendix A Answers to “Check Your Understanding” Questions 465

Glossary 477

9781587133299, TOC, 4/14/14



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