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Connecting Networks v6 Companion Guide

By Cisco Networking Academy
Published Sep 11, 2017 by Cisco Press. Part of the Companion Guide series.

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Description

Sample Content

Updates

Copyright 2018
Dimensions: 8" x 9-1/8"
Pages: 512
Edition: 1st

eBook
ISBN-10: 0-13-476088-3
ISBN-13: 978-0-13-476088-9

Connecting Networks v6 Companion Guide is the official supplemental textbook for the Connecting Networks version 6 course in the Cisco Networking Academy CCNA Routing and Switching curriculum.

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 with 347 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.

How To–Look for this icon to studythe steps you need to learn to perform certain tasks.

Interactive Activities–Reinforce your understanding of topics with dozens of exercises from the online course identified throughout the book with this icon.

Packet Tracer Activities–Explore and visualize networking concepts using Packet Tracer exercises interspersed throughout the chapters and provided in the accompanying Labs & Study Guide book.

Videos–Watch the videos embedded within the online course.

Hands-on Labs–Work through all the course labs and additional Class Activities that are included in the course and published in the separate Labs & Study Guide.

Sample Pages

Download the sample pages (includes Chapter 1 thru 3 and Index)

Introduction xix

Chapter 1 WAN Concepts 1

Objectives 1

Key Terms 1

Introduction (1.0) 3

WAN Technologies Overview (1.1) 3

Purpose of WANs (1.1.1) 3

Why a WAN? (1.1.1.1) 3

Are WANs Necessary? (1.1.1.2) 4

WAN Topologies (1.1.1.3) 5

Evolving Networks (1.1.1.4) 8

Small Office (1.1.1.5) 8

Campus Network (1.1.1.6) 9

Branch Networks (1.1.1.7) 10

Distributed Network (1.1.1.8) 11

WAN Operations (1.1.2) 13

WANs in the OSI Model (1.1.2.1) 13

Common WAN Terminology (1.1.2.2) 14

WAN Devices (1.1.2.3) 16

Circuit Switching (1.1.2.4) 17

Packet Switching (1.1.2.5) 18

Selecting a WAN Technology (1.2) 20

WAN Services (1.2.1) 20

WAN Link Connection Options (1.2.1.1) 20

Service Provider Network Infrastructure (1.2.1.2) 21

Private WAN Infrastructures (1.2.2) 23

Leased Lines (1.2.2.1) 23

Dialup (1.2.2.2) 25

ISDN (1.2.2.3) 26

Frame Relay (1.2.2.4) 28

ATM (1.2.2.5) 29

Ethernet WAN (1.2.2.6) 30

MPLS (1.2.2.7) 32

VSAT (1.2.2.8) 32

Public WAN Infrastructure (1.2.3) 33

DSL (1.2.3.1) 34

Cable (1.2.3.2) 35

Wireless (1.2.3.3) 36

3G/4G Cellular (1.2.3.4) 37

VPN Technology (1.2.3.5) 38

Selecting WAN Services (1.2.4) 39

Choosing a WAN Link Connection (1.2.4.1) 40

Choosing a WAN Link Connection (Cont.) (1.2.4.2) 41

Summary (1.3) 43

Practice 44

Class Activities 44

Labs 44

Check Your Understanding Questions 44

Chapter 2 Point-to-Point Connections 49

Objectives 49

Key Terms 49

Introduction (2.0) 51

Serial Point-to-Point Overview (2.1) 51

Serial Communications (2.1.1) 52

Serial and Parallel Ports (2.1.1.1) 52

Point-to-Point Communication Links (2.1.1.2) 53

Serial Bandwidth (2.1.1.3) 54

HDLC Encapsulation (2.1.2) 56

WAN Encapsulation Protocols (2.1.2.1) 56

HDLC Encapsulation (2.1.2.2) 57

Configuring HDLC Encapsulation (2.1.2.3) 58

Troubleshooting a Serial Interface (2.1.2.4) 59

PPP Operation (2.2) 63

Benefits of PPP (2.2.1) 63

Introducing PPP (2.2.1.1) 64

Advantages of PPP (2.2.1.2) 65

LCP and NCP (2.2.2) 65

PPP-Layered Architecture (2.2.2.1) 65

PPP: Link Control Protocol (LCP) (2.2.2.2) 66

PPP: Network Control Protocol (NCP) (2.2.2.3) 66

PPP Frame Structure (2.2.2.4) 67

PPP Sessions (2.2.3) 68

Establishing a PPP Session (2.2.3.1) 68

LCP Operation (2.2.3.2) 69

PPP Configuration Options (2.2.3.3) 72

NCP Explained (2.2.3.4) 72

PPP Implementation (2.3) 74

Configure PPP (2.3.1) 74

PPP Configuration Options (2.3.1.1) 74

PPP Basic Configuration Command (2.3.1.2) 76

PPP Compression Commands (2.3.1.3) 76

PPP Link Quality Monitoring Command (2.3.1.4) 77

PPP Multilink Commands (2.3.1.5) 78

Verifying PPP Configuration (2.3.1.6) 81

Configure PPP Authentication (2.3.2) 82

PPP Authentication Protocols (2.3.2.1) 83

Password Authentication Protocol (PAP) (2.3.2.2) 83

Challenge Handshake Authentication Protocol (CHAP) (2.3.2.3) 85

PPP Authentication Command (2.3.2.4) 86

Configuring PPP with Authentication (2.3.2.5) 87

Troubleshoot WAN Connectivity (2.4) 89

Troubleshoot PPP (2.4.1) 89

Troubleshooting PPP Serial Encapsulation (2.4.1.1) 90

Debugging PPP (2.4.1.2) 91

Troubleshooting a PPP Configuration with Authentication (2.4.1.3) 94

Summary 96

Practice 97

Class Activities 97

Labs 97

Packet Tracer Activities 98

Check Your Understanding Questions 98

Chapter 3 Branch Connections 101

Objectives 101

Key Terms 101

Introduction (3.0) 103

Remote-Access Connections (3.1) 104

Broadband Connections (3.1.1) 104

What Is a Cable System? (3.1.1.1) 104

Cable Components (3.1.1.2) 105

What Is DSL? (3.1.1.3) 107

DSL Connections (3.1.1.4) 107

Wireless Connection (3.1.1.5) 109

Select a Broadband Connection (3.1.2) 112

Comparing Broadband Solutions (3.1.2.1) 112

PPPoE (3.2) 113

PPPoE Overview (3.2.1) 113

PPPoE Motivation (3.2.1.1) 113

PPPoE Concepts (3.2.1.2) 114

Implement PPPoE (3.2.2) 115

PPPoE Configuration (3.2.2.1) 115

PPPoE Verification (3.2.2.2) 116

PPPoE Troubleshooting (3.2.2.3) 118

PPPoE Negotiation (3.2.2.4) 118

PPPoE Authentication (3.2.2.5) 119

PPPoE MTU Size (3.2.2.6) 120

VPNs (3.3) 122

Fundamentals of VPNs (3.3.1) 122

Introducing VPNs (3.3.1.1) 123

Benefits of VPNs (3.3.1.2) 124

Types of VPNs (3.3.2) 125

Site-to-Site VPNs (3.3.2.1) 125

Remote-Access VPNs (3.3.2.2) 126

DMVPN (3.3.2.3) 127

GRE (3.4) 128

GRE Overview (3.4.1) 129

GRE Introduction (3.4.1.1) 129

GRE Characteristics (3.4.1.2) 130

Implement GRE (3.4.2) 131

Configure GRE (3.4.2.1) 131

Verify GRE (3.4.2.2) 133

Troubleshoot GRE (3.4.2.3) 134

eBGP (3.5) 136

BGP Overview (3.5.1) 136

IGP and EGP Routing Protocols (3.5.1.1) 137

eBGP and iBGP (3.5.1.2) 138

BGP Design Considerations (3.5.2) 139

When to Use BGP (3.5.2.1) 139

When Not to Use BGP (3.5.2.2) 140

BGP Options (3.5.2.3) 140

eBGP Branch Configuration (3.5.3) 142

Steps to Configure eBGP (3.5.3.1) 142

BGP Sample Configuration (3.5.3.2) 143

Verify eBGP (3.5.3.3) 145

Summary (3.6) 148

Practice 149

Check Your Understanding Questions 150

Chapter 4 Access Control Lists 155

Objectives 155

Key Terms 155

Introduction (4.0.1.1) 156

Standard ACL Operation and Configuration Review (4.1) 156

ACL Operation Overview (4.1.1) 156

ACLs and the Wildcard Mask (4.1.1.1) 156

Applying ACLs to an Interface (4.1.1.2) 158

A TCP Conversation (4.1.1.3) 159

ACL Packet Filtering (4.1.1.4) 160

Types of IPv4 ACLs (4.1.2) 162

Standard and Extended IPv4 ACLs (4.1.2.1) 162

Numbered and Named ACLs (4.1.2.2) 163

Where to Place ACLs (4.1.2.3) 163

Standard ACL Placement Example (4.1.2.4) 165

Extended ACL Placement Example (4.1.2.5) 166

Standard IPv4 ACL Implementation (4.1.3) 167

Configure a Standard IPv4 ACL (4.1.3.1) 167

Apply a Standard IPv4 ACL (4.1.3.2) 169

Standard Named IPv4 ACLs (4.1.3.3) 170

Verify ACLs (4.1.3.4) 171

Extended IPv4 ACLs (4.2) 173

Structure of an Extended IPv4 ACLs (4.2.1) 173

Extended ACLs (4.2.1.1) 173

Filtering Ports and Services (4.2.1.2) 173

Configure Extended IPv4 ACLs (4.2.2) 175

Configuring Extended ACLs (4.2.2.1) 175

Applying Extended ACLs to Interfaces (4.2.2.2) 177

Filtering Traffic with Extended ACLs (4.2.2.3) 178

Creating Extended Named ACLs (4.2.2.4) 180

Verifying Extended ACLs (4.2.2.5) 181

Editing Extended ACLs (4.2.2.6) 182

IPv6 ACLs (4.3) 184

IPv6 ACL Creation (4.3.1) 184

Types of IPv6 ACLs (4.3.1.1) 184

Comparing IPv4 and IPv6 ACLs (4.3.1.2) 185

Configuring IPv6 ACLs (4.3.2) 186

Configuring IPv6 Topology (4.3.2.1) 186

Configuring IPv6 ACLs (4.3.2.2) 188

Applying an IPv6 ACL to an Interface (4.3.2.3) 189

IPv6 ACL Examples (4.3.2.4) 190

Verifying IPv6 ACLs (4.3.2.5) 192

Troubleshoot ACLs (4.4) 194

Processing Packets with ACLs (4.4.1) 194

Inbound and Outbound ACL Logic (4.4.1.1) 194

ACL Logic Operations (4.4.1.2) 195

Standard ACL Decision Process (4.4.1.3) 196

Extended ACL Decision Process (4.4.1.4) 197

Common ACL Errors (4.4.2) 197

Troubleshooting IPv4 ACLs: Example 1 (4.4.2.1) 197

Troubleshooting IPv4 ACLs: Example 2 (4.4.2.2) 198

Troubleshooting IPv4 ACLs: Example 3 (4.4.2.3) 199

Troubleshooting IPv4 ACLs: Example 4 (4.4.2.4) 200

Troubleshooting IPv4 ACLs: Example 5 (4.4.2.5) 200

Troubleshooting IPv6 ACLs: Example 1 (4.4.2.6) 201

Troubleshooting IPv6 ACLs: Example 2 (4.4.2.7) 203

Troubleshooting IPv6 ACLs: Example 3 (4.4.2.8) 205

Summary (4.5) 208

Practice 209

Check Your Understanding Questions 210

Chapter 5 Network Security and Monitoring 215

Objectives 215

Key Terms 215

Introduction (5.0.1.1) 217

LAN Security (5.1) 217

LAN Security Attacks (5.1.1) 218

Common LAN Attacks (5.1.1.1) 218

CDP Reconnaissance Attack (5.1.1.2) 219

Telnet Attacks (5.1.1.3) 220

MAC Address Table Flooding Attack (5.1.1.4) 222

VLAN Attacks (5.1.1.5) 225

DHCP Attacks (5.1.1.6) 226

LAN Security Best Practices (5.1.2) 227

Secure the LAN (5.1.2.1) 227

Mitigate MAC Address Flooding Table Attacks (5.1.2.2) 228

Mitigate VLAN Attacks (5.1.2.3) 229

Mitigate DHCP Attacks (5.1.2.4) 230

Secure Administrative Access Using AAA (5.1.2.5) 231

Secure Device Access Using 802.1X (5.1.2.6) 233

SNMP (5.2) 234

SNMP Operation (5.2.1) 234

Introduction to SNMP (5.2.1.1) 235

SNMP Operation (5.2.1.2) 236

SNMP Agent Traps (5.2.1.3) 237

SNMP Versions (5.2.1.4) 238

Community Strings (5.2.1.5) 241

Management Information Base Object ID (5.2.1.6) 243

SNMPv3 (5.2.1.7) 246

Configuring SNMP (5.2.2) 248

Steps for Configuring SNMP (5.2.2.1) 248

Verifying SNMP Configuration (5.2.2.2) 249

SNMP Best Practices (5.2.2.3) 252

Steps for Configuring SNMPv3 (5.2.2.4) 254

Verifying SNMPv3 Configuration (5.2.2.5) 254

Cisco Switch Port Analyzer (5.3) 255

SPAN Overview (5.3.1) 256

Port Mirroring (5.3.1.1) 256

Analyzing Suspicious Traffic (5.3.1.2) 257

Local SPAN (5.3.1.3) 257

Remote SPAN (5.3.1.4) 259

SPAN Configuration (5.3.2) 260

Configuring Local SPAN (5.3.2.1) 260

Verifying Local SPAN (5.3.2.2) 261

SPAN as a Troubleshooting Tool (5.3.3) 262

Troubleshooting with SPAN Overview (5.3.3.1) 262

Summary (5.4) 264

Practice 264

Check Your Understanding Questions 265

Chapter 6 Quality of Service 269

Objectives 269

Key Terms 269

Introduction (6.0.1.1) 271

QoS Overview (6.1) 271

Network Transmission Quality (6.1.1) 271

Prioritizing Traffic (6.1.1.1) 271

Bandwidth, Congestion, Delay, and Jitter (6.1.1.2) 272

Packet Loss (6.1.1.3) 273

Traffic Characteristics (6.1.2) 275

Network Traffic Trends (6.1.2.1) 275

Voice (6.1.2.2) 276

Video (6.1.2.3) 276

Data (6.1.2.4) 277

Queueing Algorithms (6.1.3) 278

Queuing Overview (6.1.3.1) 279

First-In First-Out (FIFO) (6.1.3.2) 279

Weighted Fair Queuing (WFQ) (6.1.3.3) 280

Class-Based Weighted Fair Queuing (CBWFQ) (6.1.3.4) 281

Low Latency Queuing (LLQ) (6.1.3.5) 282

QoS Mechanisms (6.2) 283

QoS Models (6.2.1) 283

Selecting an Appropriate QoS Policy Model (6.2.1.1) 283

Best Effort (6.2.1.2) 284

Integrated Services (6.2.1.3) 285

Differentiated Services (6.2.1.4) 286

QoS Implementation Techniques (6.2.2) 288

Avoiding Packet Loss (6.2.2.1) 288

QoS Tools (6.2.2.2) 289

Classification and Marking (6.2.2.3) 290

Marking at Layer 2 (6.2.2.4) 291

Marking at Layer 3 (6.2.2.5) 292

Trust Boundaries (6.2.2.6) 295

Congestion Avoidance (6.2.2.7) 296

Shaping and Policing (6.2.2.8) 297

Summary (6.3) 299

Practice 300

Check Your Understanding Questions 300

Chapter 7 Network Evolution 303

Objectives 303

Key Terms 303

Introduction (7.0.1.1) 305

Internet of Things (7.1) 305

IoT Elements (7.1.1) 305

What Is the IoT? (7.1.1.1) 305

The Converged Network and Things (7.1.1.2) 305

Challenges to Connecting Things (7.1.1.3) 306

The Six Pillars of the Cisco IoT System (7.1.1.4) 307

IoT Pillars (7.1.2) 307

The Network Connectivity Pillar (7.1.2.1) 308

The Fog Computing Pillar (7.1.2.2) 308

The Security Pillar (7.1.2.3) 311

Data Analytics Pillar (7.1.2.4) 312

Management and Automation Pillar (7.1.2.5) 313

Application Enablement Platform Pillar (7.1.2.6) 313

Cloud and Virtualization (7.2) 314

Cloud Computing (7.2.1) 314

Cloud Overview (7.2.1.2) 314

Cloud Services (7.2.1.3) 315

Cloud Models (7.2.1.4) 315

Cloud Computing versus Data Center (7.2.1.5) 316

Virtualization (7.2.2) 317

Cloud Computing and Virtualization (7.2.2.1) 317

Dedicated Servers (7.2.2.2) 318

Server Virtualization (7.2.2.3) 319

Advantages of Virtualization (7.2.2.4) 320

Abstraction Layers (7.2.2.5) 321

Type 2 Hypervisors (7.2.2.6) 321

Virtual Network Infrastructure (7.2.3) 323

Type 1 Hypervisors (7.2.3.1) 323

Installing a VM on a Hypervisor (7.2.3.2) 324

Network Virtualization (7.2.3.3) 324

Network Programming (7.3) 326

Software-Defined Networking (7.3.1) 326

Control Plane and Data Plane (7.3.1.1) 326

Virtualizing the Network (7.3.1.2) 327

SDN Architecture (7.3.1.3) 329

Controllers (7.3.2) 331

SDN Controller and Operations (7.3.2.1) 331

Cisco Application Centric Infrastructure (7.3.2.2) 332

Core Components of ACI (7.3.2.3) 332

Spine-Leaf Topology (7.3.2.4) 333

SDN Types (7.3.2.5) 334

APIC-EM Features (7.3.2.6) 336

APIC-EM ACL Analysis (7.3.2.7) 337

Summary (7.4) 340

Practice 341

Check Your Understanding Questions 341

Chapter 8 Network Troubleshooting 347

Objectives 347

Key Terms 347

Introduction (8.0.1.1) 349

Troubleshooting Methodology (8.1) 349

Network Documentation (8.1.1) 349

Documenting the Network (8.1.1.1) 349

Network Topology Diagrams (8.1.1.2) 352

Establishing a Network Baseline (8.1.1.3) 355

Steps to Establish a Network Baseline (8.1.1.4) 355

Measuring Data (8.1.1.5) 358

Troubleshooting Process (8.1.2) 360

General Troubleshooting Procedures (8.1.2.1) 360

Gathering Symptoms (8.1.2.2) 362

Questioning End Users (8.1.2.3) 364

Isolating the Issue Using Layered Models (8.1.3) 365

Using Layered Models for Troubleshooting (8.1.3.1) 365

Troubleshooting Methods (8.1.3.2) 367

Other Troubleshooting Methods (8.1.3.3) 370

Guidelines for Selecting a Troubleshooting Method (8.1.3.4) 371

Troubleshooting Scenarios (8.2) 372

Using IP SLA (8.2.1) 372

IP SLA Concepts (8.2.1.1) 372

IP SLA Configuration (8.2.1.2) 373

Sample IP SLA Configuration (8.2.1.3) 375

Verifying an IP SLA Configuration (8.2.1.4) 376

Troubleshooting Tools (8.2.2) 377

Software Troubleshooting Tools (8.2.2.1) 377

Protocol Analyzers (8.2.2.2) 379

Hardware Troubleshooting Tools (8.2.2.3) 380

Using a Syslog Server for Troubleshooting (8.2.2.4) 385

Symptoms and Causes of Network Troubleshooting (8.2.3) 387

Physical Layer Troubleshooting (8.2.3.1) 387

Data Link Layer Troubleshooting (8.2.3.2) 390

Network Layer Troubleshooting (8.2.3.3) 392

Transport Layer Troubleshooting: ACLs (8.2.3.4) 394

Transport Layer Troubleshooting: NAT for IPv4 (8.2.3.5) 396

Application Layer Troubleshooting (8.2.3.6) 397

Troubleshooting IP Connectivity (8.2.4) 398

Components of Troubleshooting End-to-End Connectivity (8.2.4.1) 398

End-to-End Connectivity Problem Initiates Troubleshooting (8.2.4.2) 400

Step 1: Verify the Physical Layer (8.2.4.3) 402

Step 2: Check for Duplex Mismatches (8.2.4.4) 404

Step 3: Verify Layer 2 and Layer 3 Addressing on the Local Network (8.2.4.5) 406

Step 4: Verify Default Gateway (8.2.4.6) 411

Step 5: Verify Correct Path (8.2.4.7) 415

Step 6: Verify the Transport Layer (8.2.4.8) 418

Step 7: Verify ACLs (8.2.4.9) 420

Step 8: Verify DNS (8.2.4.10) 422

Summary (8.3) 425

Practice 426

Check Your Understanding Questions 427

Appendix A Answers to the “Check Your Understanding” Questions 431

Glossary 443

9781587134326 TOC 8/11/2017

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If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out

Users can always make an informed choice as to whether they should proceed with certain services offered by Cisco Press. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.ciscopress.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

As required by law.
With the consent of the individual (or their parent, if the individual is a minor)
In response to a subpoena, court order or legal process, to the extent permitted or required by law
To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
To investigate or address actual or suspected fraud or other illegal activities
To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links

This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020

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