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Viser: Connecting Networks Companion Guide
Connecting Networks Companion Guide
Cisco Networking Academy Program Staff
(2014)
Sprog: Engelsk
Pearson Education, Limited
570,00 kr.
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Detaljer om varen
- Hardback: 576 sider
- Udgiver: Pearson Education, Limited (Maj 2014)
- ISBN: 9781587133329
Connecting Networks Companion Guide is the official supplemental textbook for the Connecting Networks course in the Cisco® Networking Academy® CCNA® Routing and Switching curriculum.
This course discusses the WAN technologies and network services required by converged applications in a complex network. The course allows you to understand the selection criteria of network devices and WAN technologies to meet network requirements. You will learn how to configure and troubleshoot network devices and resolve common issues with data link protocols. You will also develop the knowledge and skills needed to implement IPSec and virtual private network (VPN) operations in a complex 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 with 195 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 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.
Introduction xix
Chapter 1: Hierarchical Network Designs 1 Objectives 1 Key Terms 1 Introduction (1.0.1.1) 2 Hierarchical Network Design Overview (1.1) 2 Enterprise Network Campus Design (1.1.1) 2 Network Requirements (1.1.1.1) 3 Structured Engineering Principles (1.1.1.2) 4 Hierarchical Network Design (1.1.2) 4 Network Hierarchy (1.1.2.1) 4 The Access Layer (1.1.2.2) 6 The Distribution Layer (1.1.2.3) 7 The Core Layer (1.1.2.4) 9 Two-Tier Collapsed Core Design (1.1.2.5) 10 Cisco Enterprise Architecture (1.2) 10 Modular Design (1.2.1.1) 11 Modules in the Enterprise Architecture (1.2.1.2) 12 Cisco Enterprise Architecture Model (1.2.2) 14 Cisco Enterprise Architecture Model (1.2.2.1) 14 Cisco Enterprise Campus (1.2.2.2) 15 Cisco Enterprise Edge (1.2.2.3) 17 Service Provider Edge (1.2.2.4) 18 Remote Functional Area (1.2.2.5) 21 Enterprise Branch 21 Enterprise Teleworker 22 Enterprise Data Center 22 Evolving Network Architectures (1.3) 22 IT Challenges (1.3.1.1) 22 Emerging Enterprise Architectures (1.3.1.2) 23 Emerging Network Architectures (1.3.2) 24 Cisco Borderless Networks (1.3.2.1) 24 Collaboration Architecture (1.3.2.2) 25 Data Center and Virtualization (1.3.2.3) 26 Expanding the Network (1.3.2.4) 27 Summary (1.4) 29 Practice 30 Class Activities 30 Packet Tracer Activities 30 Check Your Understanding Questions 31
Chapter 2: Connecting the WAN 35 Objectives 35 Key Terms 35 Introduction (2.0.1.1) 37 WAN Technologies Overview (2.1) 37 Why a WAN? (2.1.1.1) 37 Are WANs Necessary? (2.1.1.2) 38 Evolving Networks (2.1.1.3) 39 Small Office (2.1.1.4) 39 Campus Network (2.1.1.5) 40 Branch Networks (2.1.1.6) 42 Distributed Network (2.1.1.7) 43 WAN Operations (2.1.2) 44 WANs in the OSI Model (2.1.2.1) 44 Common WAN Terminology (2.1.2.2) 45 WAN Devices (2.1.2.3) 47 Circuit-Switched Networks (2.1.2.4) 48 Packet-Switched Networks (2.1.2.5) 50 Selecting a WAN Technology (2.2) 51 WAN Link Connection Options (2.2.1.1) 51 Service Provider Network Infrastructure (2.2.1.2) 52 Private WAN Infrastructures (2.2.2) 54 Leased Lines (2.2.2.1) 54 Dialup (2.2.2.2) 55 ISDN (2.2.2.3) 56 Frame Relay (2.2.2.4) 58 ATM (2.2.2.5) 59 Ethernet WAN (2.2.2.6) 60 MPLS (2.2.2.7) 62 VSAT (2.2.2.8) 63 Public WAN Infrastructure (2.2.3) 64 DSL (2.2.3.1) 64 Cable (2.2.3.2) 65 Wireless (2.2.3.3) 66 3G/4G Cellular (2.2.3.4) 67 VPN Technology (2.2.3.5) 68 Selecting WAN Services (2.2.4) 70 Choosing a WAN Link Connection (2.2.4.1,
2.2.4.2) 70 What Is the Purpose of the WAN? 70 What Is the Geographic Scope? 70 What Are the Traffic Requirements? 71 Summary (2.3) 73 Practice 74 Class Activities 74 Labs 74 Check Your Understanding Questions 74
Chapter 3: Point-to-Point Connections 79 Objectives 79 Key Terms 79 Introduction (3.0.1.1) 80 Serial Point-to-Point Overview (3.1) 80 Serial Communications (3.1.1) 81 Serial and Parallel Ports (3.1.1.1) 81 Serial Communication (3.1.1.2) 82 Point-to-Point Communication Links (3.1.1.3) 84 Time-Division Multiplexing (3.1.1.4) 85 Statistical Time-Division Multiplexing (3.1.1.5) 86 TDM Examples -- Sonet and SDM (3.1.1.6) 87 Demarcation Point (3.1.1.7) 88 DTE-DCE (3.1.1.8) 90 Serial Cables (3.1.1.9) 91 Serial Bandwidth (3.1.1.10) 94 HDLC Encapsulation (3.1.2) 96 WAN Encapsulation Protocols (3.1.2.1) 96 HDLC Encapsulation (3.1.2.2) 97 HDLC Frame Types (3.1.2.3) 98 Configuring HDLC Encapsulation (3.1.2.4) 100 Troubleshooting a Serial Interface (3.1.2.5) 100 PPP Operation (3.2) 104 Benefits of PPP (3.2.1) 104 Introducing PPP (3.2.1.1) 104 Advantages of PPP (3.2.1.2) 106 LCP and NCP (3.2.2) 106 PPP Layered Architecture (3.2.2.1) 106 PPP -- Link Control Protocol (LCP) (3.2.2.2) 107 PPP -- Network Control Protocol (NCP) (3.2.2.3) 108 PPP Frame Structure (3.2.2.4) 108 PPP Sessions (3.2.3) 109 Establishing a PPP Session (3.2.3.1) 110 LCP Operation (3.2.3.2) 111 LCP Packet (3.2.3.3) 113 PPP Configuration Options (3.2.3.4) 115 NCP Explained (3.2.3.5) 117 Configure PPP (3.3) 118 Configure PPP (3.3.1) 118 PPP Configuration Options (3.3.1.1) 119 PPP Basic Configuration Command (3.3.1.2) 120 PPP Compression Commands (3.3.1.3) 121 PPP Link Quality Monitoring Command (3.3.1.4) 122 PPP Multilink Commands (3.3.1.5) 123 Verifying PPP Configuration (3.3.1.6) 125 PPP Authentication (3.3.2) 126 PPP Authentication Protocols (3.3.2.1) 127 Password Authentication Protocol (PAP) (3.3.2.2) 127 Challenge Handshake Authentication Protocol (CHAP) (3.3.2.3) 129 PPP Encapsulation and Authentication Process (3.3.2.4) 131 Configuring PPP Authentication (3.3.2.5) 134 Configuring PPP with Authentication (3.3.2.6) 136 Troubleshoot WAN Connectivity (3.4) 138 Troubleshoot PPP (3.4.1) 138 Troubleshooting PPP Serial Encapsulation (3.4.1.1) 138 Debug PPP (3.4.1.2) 140 Troubleshooting a PPP Configuration with Authentication (3.4.1.3) 142 Summary (3.5) 145 Practice 146 Class Activities 146 Labs 146 Packet Tracer Activities 146 Check Your Understanding Questions 147
Chapter 4: Frame Relay 153 Objectives 153 Key Terms 153 Introduction (4.0.1.1) 154 Introduction to Frame Relay (4.1) 154 Benefits of Frame Relay (4.1.1) 155 Introducing Frame Relay (4.1.1.1) 155 Benefits of Frame Relay WAN Technology (4.1.1.2) 156 Dedicated Line Requirements (4.1.1.3) 157 Cost-Effectiveness and Flexibility of Frame Relay (4.1.1.4) 159 Frame Relay Operation (4.1.2) 160 Virtual Circuits (4.1.2.1) 160 Multiple Virtual Circuits (4.1.2.2) 163 Frame Relay Encapsulation (4.1.2.3) 165 Frame Relay Topologies (4.1.2.4,
4.1.2.5) 167 Frame Relay Address Mapping (4.1.2.6) 171 Local Management Interface (LMI) (4.1.2.7) 174 LMI Extensions (4.1.2.8) 175 Using LMI and Inverse ARP to Map Addresses (4.1.2.9) 178 Advanced Frame Relay Concepts (4.1.3) 180 Access Rate and Committed Information Rate (4.1.3.1) 180 Frame Relay Example (4.1.3.2) 181 Bursting (4.1.3.3) 183 Frame Relay Flow Control (4.1.3.4) 184 Configure Frame Relay (4.2) 187 Configure Basic Frame Relay (4.2.1) 187 Basic Frame Relay Configuration Commands (4.2.1.1) 187 Configuring a Static Frame Relay Map (4.2.1.2) 190 Verify a Static Frame Relay Map (4.2.1.3) 192 Configure Subinterfaces (4.2.2) 193 Reachability Issues (4.2.2.1) 193 Solving Reachability Issues (4.2.2.2) 196 Configuring Point-to-Point Subinterfaces (4.2.2.3) 199 Example: Configuring Point-to-Point Subinterfaces (4.2.2.4) 200 Troubleshoot Connectivity (4.3) 203 Troubleshoot Frame Relay (4.3.1) 203 Verifying Frame Relay Operation: Frame Relay Interface (4.3.1.1) 203 Verifying Frame Relay Operation: LMI Operations (4.3.1.2) 204 Verifying Frame Relay Operation: PVC Status (4.3.1.3) 205 Verifying Frame Relay Operation: Inverse ARP (4.3.1.4) 205 Troubleshooting Frame Relay Operation (4.3.1.5) 207 Summary (4.4) 209 Practice 210 Class Activities 210 Labs 210 Packet Tracer Activities 210 Check Your Understanding Questions 211
Chapter 5: Network Address Translation for IPv4 217 Objectives 217 Key Terms 217 Introduction (5.0.1.1) 218 NAT Operation (5.1) 219 NAT Characteristics (5.1.1) 219 IPv4 Private Address Space (5.1.1.1) 219 What Is NAT? (5.1.1.2) 220 NAT Terminology (5.1.1.3) 221 How NAT Works (5.1.1.5) 224 Types of NAT (5.1.2) 225 Static NAT (5.1.2.1) 225 Dynamic NAT (5.1.2.2) 226 Port Address Translation (PAT) (5.1.2.3) 227 Next Available Port (5.1.2.4) 228 Comparing NAT and PAT (5.1.2.5) 230 Benefits of NAT (5.1.3) 231 Benefits of NAT (5.1.3.1) 231 Disadvantages of NAT (5.1.3.2) 232 Configuring NAT (5.2) 233 Configuring Static NAT (5.2.1) 233 Configuring Static NAT (5.2.1.1) 233 Analyzing Static NAT (5.2.1.2) 235 Verifying Static NAT (5.2.1.3) 237 Configuring Dynamic NAT (5.2.2) 238 Dynamic NAT Operation (5.2.2.1) 238 Configuring Dynamic NAT (5.2.2.2) 239 Analyzing Dynamic NAT (5.2.2.3) 242 Verifying Dynamic NAT (5.2.2.4) 244 Configuring Port Address Translation (PAT) (5.2.3) 247 Configuring PAT: Address Pool (5.2.3.1) 247 Configuring PAT: Single Address (5.2.3.2) 249 Analyzing PAT (5.2.3.3) 251 Verifying PAT (5.2.3.4) 253 Port Forwarding (5.2.4) 255 Port Forwarding (5.2.4.1) 255 SOHO Example (5.2.4.2) 257 Configuring Port Forwarding with IOS (5.2.4.3) 258 Configuring NAT and IPv6 (5.2.5) 260 NAT for IPv6? (5.2.5.1) 260 IPv6 Unique Local Addresses (5.2.5.2) 262 NAT for IPv6 (5.2.5.3) 263 Troubleshooting NAT (5.3) 264 Troubleshooting NAT: show Commands (5.3.1.1) 264 Troubleshooting NAT: debug Command (5.3.1.2) 266 Case Study (5.3.1.3)
Chapter 1: Hierarchical Network Designs 1 Objectives 1 Key Terms 1 Introduction (1.0.1.1) 2 Hierarchical Network Design Overview (1.1) 2 Enterprise Network Campus Design (1.1.1) 2 Network Requirements (1.1.1.1) 3 Structured Engineering Principles (1.1.1.2) 4 Hierarchical Network Design (1.1.2) 4 Network Hierarchy (1.1.2.1) 4 The Access Layer (1.1.2.2) 6 The Distribution Layer (1.1.2.3) 7 The Core Layer (1.1.2.4) 9 Two-Tier Collapsed Core Design (1.1.2.5) 10 Cisco Enterprise Architecture (1.2) 10 Modular Design (1.2.1.1) 11 Modules in the Enterprise Architecture (1.2.1.2) 12 Cisco Enterprise Architecture Model (1.2.2) 14 Cisco Enterprise Architecture Model (1.2.2.1) 14 Cisco Enterprise Campus (1.2.2.2) 15 Cisco Enterprise Edge (1.2.2.3) 17 Service Provider Edge (1.2.2.4) 18 Remote Functional Area (1.2.2.5) 21 Enterprise Branch 21 Enterprise Teleworker 22 Enterprise Data Center 22 Evolving Network Architectures (1.3) 22 IT Challenges (1.3.1.1) 22 Emerging Enterprise Architectures (1.3.1.2) 23 Emerging Network Architectures (1.3.2) 24 Cisco Borderless Networks (1.3.2.1) 24 Collaboration Architecture (1.3.2.2) 25 Data Center and Virtualization (1.3.2.3) 26 Expanding the Network (1.3.2.4) 27 Summary (1.4) 29 Practice 30 Class Activities 30 Packet Tracer Activities 30 Check Your Understanding Questions 31
Chapter 2: Connecting the WAN 35 Objectives 35 Key Terms 35 Introduction (2.0.1.1) 37 WAN Technologies Overview (2.1) 37 Why a WAN? (2.1.1.1) 37 Are WANs Necessary? (2.1.1.2) 38 Evolving Networks (2.1.1.3) 39 Small Office (2.1.1.4) 39 Campus Network (2.1.1.5) 40 Branch Networks (2.1.1.6) 42 Distributed Network (2.1.1.7) 43 WAN Operations (2.1.2) 44 WANs in the OSI Model (2.1.2.1) 44 Common WAN Terminology (2.1.2.2) 45 WAN Devices (2.1.2.3) 47 Circuit-Switched Networks (2.1.2.4) 48 Packet-Switched Networks (2.1.2.5) 50 Selecting a WAN Technology (2.2) 51 WAN Link Connection Options (2.2.1.1) 51 Service Provider Network Infrastructure (2.2.1.2) 52 Private WAN Infrastructures (2.2.2) 54 Leased Lines (2.2.2.1) 54 Dialup (2.2.2.2) 55 ISDN (2.2.2.3) 56 Frame Relay (2.2.2.4) 58 ATM (2.2.2.5) 59 Ethernet WAN (2.2.2.6) 60 MPLS (2.2.2.7) 62 VSAT (2.2.2.8) 63 Public WAN Infrastructure (2.2.3) 64 DSL (2.2.3.1) 64 Cable (2.2.3.2) 65 Wireless (2.2.3.3) 66 3G/4G Cellular (2.2.3.4) 67 VPN Technology (2.2.3.5) 68 Selecting WAN Services (2.2.4) 70 Choosing a WAN Link Connection (2.2.4.1,
2.2.4.2) 70 What Is the Purpose of the WAN? 70 What Is the Geographic Scope? 70 What Are the Traffic Requirements? 71 Summary (2.3) 73 Practice 74 Class Activities 74 Labs 74 Check Your Understanding Questions 74
Chapter 3: Point-to-Point Connections 79 Objectives 79 Key Terms 79 Introduction (3.0.1.1) 80 Serial Point-to-Point Overview (3.1) 80 Serial Communications (3.1.1) 81 Serial and Parallel Ports (3.1.1.1) 81 Serial Communication (3.1.1.2) 82 Point-to-Point Communication Links (3.1.1.3) 84 Time-Division Multiplexing (3.1.1.4) 85 Statistical Time-Division Multiplexing (3.1.1.5) 86 TDM Examples -- Sonet and SDM (3.1.1.6) 87 Demarcation Point (3.1.1.7) 88 DTE-DCE (3.1.1.8) 90 Serial Cables (3.1.1.9) 91 Serial Bandwidth (3.1.1.10) 94 HDLC Encapsulation (3.1.2) 96 WAN Encapsulation Protocols (3.1.2.1) 96 HDLC Encapsulation (3.1.2.2) 97 HDLC Frame Types (3.1.2.3) 98 Configuring HDLC Encapsulation (3.1.2.4) 100 Troubleshooting a Serial Interface (3.1.2.5) 100 PPP Operation (3.2) 104 Benefits of PPP (3.2.1) 104 Introducing PPP (3.2.1.1) 104 Advantages of PPP (3.2.1.2) 106 LCP and NCP (3.2.2) 106 PPP Layered Architecture (3.2.2.1) 106 PPP -- Link Control Protocol (LCP) (3.2.2.2) 107 PPP -- Network Control Protocol (NCP) (3.2.2.3) 108 PPP Frame Structure (3.2.2.4) 108 PPP Sessions (3.2.3) 109 Establishing a PPP Session (3.2.3.1) 110 LCP Operation (3.2.3.2) 111 LCP Packet (3.2.3.3) 113 PPP Configuration Options (3.2.3.4) 115 NCP Explained (3.2.3.5) 117 Configure PPP (3.3) 118 Configure PPP (3.3.1) 118 PPP Configuration Options (3.3.1.1) 119 PPP Basic Configuration Command (3.3.1.2) 120 PPP Compression Commands (3.3.1.3) 121 PPP Link Quality Monitoring Command (3.3.1.4) 122 PPP Multilink Commands (3.3.1.5) 123 Verifying PPP Configuration (3.3.1.6) 125 PPP Authentication (3.3.2) 126 PPP Authentication Protocols (3.3.2.1) 127 Password Authentication Protocol (PAP) (3.3.2.2) 127 Challenge Handshake Authentication Protocol (CHAP) (3.3.2.3) 129 PPP Encapsulation and Authentication Process (3.3.2.4) 131 Configuring PPP Authentication (3.3.2.5) 134 Configuring PPP with Authentication (3.3.2.6) 136 Troubleshoot WAN Connectivity (3.4) 138 Troubleshoot PPP (3.4.1) 138 Troubleshooting PPP Serial Encapsulation (3.4.1.1) 138 Debug PPP (3.4.1.2) 140 Troubleshooting a PPP Configuration with Authentication (3.4.1.3) 142 Summary (3.5) 145 Practice 146 Class Activities 146 Labs 146 Packet Tracer Activities 146 Check Your Understanding Questions 147
Chapter 4: Frame Relay 153 Objectives 153 Key Terms 153 Introduction (4.0.1.1) 154 Introduction to Frame Relay (4.1) 154 Benefits of Frame Relay (4.1.1) 155 Introducing Frame Relay (4.1.1.1) 155 Benefits of Frame Relay WAN Technology (4.1.1.2) 156 Dedicated Line Requirements (4.1.1.3) 157 Cost-Effectiveness and Flexibility of Frame Relay (4.1.1.4) 159 Frame Relay Operation (4.1.2) 160 Virtual Circuits (4.1.2.1) 160 Multiple Virtual Circuits (4.1.2.2) 163 Frame Relay Encapsulation (4.1.2.3) 165 Frame Relay Topologies (4.1.2.4,
4.1.2.5) 167 Frame Relay Address Mapping (4.1.2.6) 171 Local Management Interface (LMI) (4.1.2.7) 174 LMI Extensions (4.1.2.8) 175 Using LMI and Inverse ARP to Map Addresses (4.1.2.9) 178 Advanced Frame Relay Concepts (4.1.3) 180 Access Rate and Committed Information Rate (4.1.3.1) 180 Frame Relay Example (4.1.3.2) 181 Bursting (4.1.3.3) 183 Frame Relay Flow Control (4.1.3.4) 184 Configure Frame Relay (4.2) 187 Configure Basic Frame Relay (4.2.1) 187 Basic Frame Relay Configuration Commands (4.2.1.1) 187 Configuring a Static Frame Relay Map (4.2.1.2) 190 Verify a Static Frame Relay Map (4.2.1.3) 192 Configure Subinterfaces (4.2.2) 193 Reachability Issues (4.2.2.1) 193 Solving Reachability Issues (4.2.2.2) 196 Configuring Point-to-Point Subinterfaces (4.2.2.3) 199 Example: Configuring Point-to-Point Subinterfaces (4.2.2.4) 200 Troubleshoot Connectivity (4.3) 203 Troubleshoot Frame Relay (4.3.1) 203 Verifying Frame Relay Operation: Frame Relay Interface (4.3.1.1) 203 Verifying Frame Relay Operation: LMI Operations (4.3.1.2) 204 Verifying Frame Relay Operation: PVC Status (4.3.1.3) 205 Verifying Frame Relay Operation: Inverse ARP (4.3.1.4) 205 Troubleshooting Frame Relay Operation (4.3.1.5) 207 Summary (4.4) 209 Practice 210 Class Activities 210 Labs 210 Packet Tracer Activities 210 Check Your Understanding Questions 211
Chapter 5: Network Address Translation for IPv4 217 Objectives 217 Key Terms 217 Introduction (5.0.1.1) 218 NAT Operation (5.1) 219 NAT Characteristics (5.1.1) 219 IPv4 Private Address Space (5.1.1.1) 219 What Is NAT? (5.1.1.2) 220 NAT Terminology (5.1.1.3) 221 How NAT Works (5.1.1.5) 224 Types of NAT (5.1.2) 225 Static NAT (5.1.2.1) 225 Dynamic NAT (5.1.2.2) 226 Port Address Translation (PAT) (5.1.2.3) 227 Next Available Port (5.1.2.4) 228 Comparing NAT and PAT (5.1.2.5) 230 Benefits of NAT (5.1.3) 231 Benefits of NAT (5.1.3.1) 231 Disadvantages of NAT (5.1.3.2) 232 Configuring NAT (5.2) 233 Configuring Static NAT (5.2.1) 233 Configuring Static NAT (5.2.1.1) 233 Analyzing Static NAT (5.2.1.2) 235 Verifying Static NAT (5.2.1.3) 237 Configuring Dynamic NAT (5.2.2) 238 Dynamic NAT Operation (5.2.2.1) 238 Configuring Dynamic NAT (5.2.2.2) 239 Analyzing Dynamic NAT (5.2.2.3) 242 Verifying Dynamic NAT (5.2.2.4) 244 Configuring Port Address Translation (PAT) (5.2.3) 247 Configuring PAT: Address Pool (5.2.3.1) 247 Configuring PAT: Single Address (5.2.3.2) 249 Analyzing PAT (5.2.3.3) 251 Verifying PAT (5.2.3.4) 253 Port Forwarding (5.2.4) 255 Port Forwarding (5.2.4.1) 255 SOHO Example (5.2.4.2) 257 Configuring Port Forwarding with IOS (5.2.4.3) 258 Configuring NAT and IPv6 (5.2.5) 260 NAT for IPv6? (5.2.5.1) 260 IPv6 Unique Local Addresses (5.2.5.2) 262 NAT for IPv6 (5.2.5.3) 263 Troubleshooting NAT (5.3) 264 Troubleshooting NAT: show Commands (5.3.1.1) 264 Troubleshooting NAT: debug Command (5.3.1.2) 266 Case Study (5.3.1.3)
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