Trust the best-selling Official Cert Guide series from Cisco Press to help you learn, prepare, and practice for exam success. It is built with the objective of providing assessment, review, and practice to help ensure you are fully prepared for your certification exam. CCNA 200-301 Official Cert Guide, Volume 2, Second Edition presents you with an organized test-preparation routine using proven series elements and techniques. Do I Know This Already? quizzes open each chapter and enable you to decide how much time you need to spend on each section. Exam topic lists make referencing easy.…mehr
Trust the best-selling Official Cert Guide series from Cisco Press to help you learn, prepare, and practice for exam success. It is built with the objective of providing assessment, review, and practice to help ensure you are fully prepared for your certification exam. CCNA 200-301 Official Cert Guide, Volume 2, Second Edition presents you with an organized test-preparation routine using proven series elements and techniques. Do I Know This Already? quizzes open each chapter and enable you to decide how much time you need to spend on each section. Exam topic lists make referencing easy. Chapter-ending Exam Preparation Tasks help you drill on key concepts you must know thoroughly. * Master Cisco CCNA 200-301 exam topics * Assess your knowledge with chapter-opening quizzes * Review key concepts with exam preparation tasks * Practice with realistic exam questions in the practice test software CCNA 200-301 Official Cert Guide, Volume 2, Second Edition from Cisco Press enables you to succeed on the exam the first time and is the only self-study resource approved by Cisco. Best-selling author Wendell Odom shares preparation hints and test-taking tips, helping you identify areas of weakness and improve both your conceptual knowledge and hands-on skills. This complete study package includes * A test-preparation routine proven to help you pass the exams * Do I Know This Already? quizzes, which enable you to decide how much time you need to spend on each section * Chapter-ending Key Topic tables, which help you drill on key concepts you must know thoroughly * The powerful Pearson Test Prep Practice Test software, complete with hundreds of well-reviewed, exam-realistic questions, customization options, and detailed performance reports * A free copy of the CCNA 200-301 Network Simulator Volume 2 Lite software, complete with meaningful lab exercises that help you hone your hands-on skills with the command-line interface for routers and switches * Links to a series of hands-on config labs developed by the author * Online, interactive practice exercises that help you enhance your knowledge and hone your configuration skills * More than 2 hours of video mentoring from the author * An online, interactive Flash Cards application to help you drill on Key Terms by chapter * A final preparation chapter, which guides you through tools and resources to help you craft your review and test-taking strategies * Study plan suggestions and templates to help you organize and optimize your study time Well regarded for its level of detail, study plans, assessment features, hands-on labs, and challenging review questions and exercises, this official study guide helps you master the concepts and techniques that ensure your exam success. This official study guide has been fully updated to help you master the topics on the latest CCNA 200-301 exam. Volume 2 topic coverage includes * Wireless LANs * IP access control lists * Security services * IP services * Network architecture * Network automation Content Update Program This fully updated second edition includes the latest topics and additional information covering changes to the latest CCNA 200-301 exam. Visit ciscopress.com/newcerts for information on annual digital updates for this book that align to Cisco exam blueprint version changes. Companion Website: The companion website contains more than 600 unique practice exam questions, including two Volume 2 exam banks and four full CCNA exam banks, CCNA Network Simulator Lite software, online review and practice exercises, Key Term flashcards, and 2+ hours of video training. In addition to the wealth of updated content, this new edition includes a series of free hands-on exercises to help you master several real-world configuration and troubleshooting activities. These exercises can be performed on the CCNA 200-301 Network Simulator Lite, Volume 2 software included for free on the companion website that accompanies this book. This software, which simulates the experience of working on actual Cisco routers and switches, contains the following lab exercises, covering the ACL topics in Part II: 1. ACL I 2. ACL II 3. ACL III 4. ACL IV 5. ACL V 6. ACL VI 7. ACL Analysis I 8. Named ACL I 9. Named ACL II 10. Named ACL III 11. Standard ACL Configuration Scenario 12. Extended ACL Configuration Scenario I 13. Extended ACL Configuration Scenario II If you are interested in exploring more hands-on labs and practice configuration and troubleshooting with more router and switch commands, go to www.pearsonitcertification.com/networksimulator for demos and to review the latest products for sale. Also available from Cisco Press for CCNA study is the CCNA 200-301 Official Cert Guide Volume 2 Premium Edition eBook and Practice Test, Second Edition. This digital-only certification preparation product combines an eBook with an enhanced Pearson Test Prep Practice Test. This integrated learning package * Enables you to focus on individual topic areas or take complete, timed exams * Includes direct links from each question to detailed tutorials to help you understand the concepts behind the questions * Provides unique sets of exam-realistic practice questions * Tracks your performance and provides feedback on a module-by-module basis, laying out a complete assessment of your knowledge to help you focus your study where it is needed mostHinweis: Dieser Artikel kann nur an eine deutsche Lieferadresse ausgeliefert werden.
Wendell Odom, CCIE Enterprise No. 1624, was the first Cisco Press author for Cisco certification guides. He wrote all prior editions of this book, along with books on topics ranging from introductory networking to CCENT, CCNA R&S, CCNA DC, CCNP ROUTE, CCNP QoS, and CCIE R&S. In his four decades as a networker, he has worked as a network engineer, consultant, systems engineer, instructor, and course developer. He now spends his time focused on updating the CCNA books, his blog (www.certskills.com), building his new CCNA YouTube channel (www.youtube.com/@NetworkUpskill), and teaching online (www.certskills.com/courses). You can find him at www.LinkedIn.com/in/WendellOdom, Twitter (@WendellOdom), and at his blog, which provides a variety of free CCNA learning resources. Jason Gooley, CCIEx2 (RS, SP) No. 38759, is a very enthusiastic and engaging speaker who focuses on teaching others. Jason has more than 30 years of experience in the industry and currently works as the technical evangelist for the Worldwide Enterprise Networking and Software Sales team at Cisco. Jason is very passionate about helping others in the industry succeed. In addition to being a public speaker, Jason has authored numerous Cisco Press books, is a CiscoLive Distinguished Speaker, and is a developer of CCIE exams, training, and blogs for Learning@Cisco. Jason is also a co-founder and member of the Program Committee Board for the Chicago Network Operators Group (CHI-NOG). Jason is the founder and host of @MetalDevOps, which is a YouTube video show about the intersection of metal music and technology. Jason has earned the nickname of The Godfather of Programmability from his students and peers and continues to help drive the industry forward around topics such as network programmability and automation. David Hucaby, CCIE No. 4594, CWNE No. 292, is a technical education content engineer for Cisco Meraki. Previously, he worked as a wireless escalation engineer in a large healthcare environment for more than 20 years. David holds bachelors and masters degrees in electrical engineering. He has been authoring Cisco Press titles for 25 years. David lives in Kentucky.
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Introduction xxxi Part I Wireless LANs 3 Chapter 1 Fundamentals of Wireless Networks 4 Do I Know This Already? Quiz 4 Foundation Topics 6 Comparing Wired and Wireless Networks 6 Wireless LAN Topologies 7 Basic Service Set 8 Distribution System 10 Extended Service Set 12 Independent Basic Service Set 13 Other Wireless Topologies 14 Repeater 14 Workgroup Bridge 15 Outdoor Bridge 16 Mesh Network 17 Wireless Bands and Channels 17 Chapter Review 20 Chapter 2 Analyzing Cisco Wireless Architectures 22 Do I Know This Already? Quiz 22 Foundation Topics 24 Autonomous AP Architecture 24 Cloud-based AP Architecture 26 Split-MAC Architectures 28 Comparing Cisco Wireless LAN Controller Deployments 32 Cisco AP Modes 35 FlexConnect Mode 36 Chapter Review 37 Chapter 3 Securing Wireless Networks 40 Do I Know This Already? Quiz 40 Foundation Topics 42 Anatomy of a Secure Connection 42 Authentication 43 Message Privacy 44 Message Integrity 45 Wireless Client Authentication Methods 46 Open Authentication 46 WEP 47 802.1x/EAP 47 LEAP 48 EAP-FAST 49 PEAP 49 EAP-TLS 50 Wireless Privacy and Integrity Methods 50 TKIP 50 CCMP 51 GCMP 51 WPA, WPA2, and WPA3 51 Chapter Review 53 Chapter 4 Building a Wireless LAN 56 Do I Know This Already? Quiz 56 Foundation Topics 58 Connecting a Cisco AP 58 Accessing a Cisco WLC 59 Connecting a Cisco WLC 63 WLC Physical Ports 63 Configuring a WLAN 65 Configuring a WLAN on an IOS-XE WLC 67 Step 1: Configure a WLAN Profile 69 Step 2: Configure a Policy Profile 74 Step 3: Map the WLAN and Policy Profiles to a Policy Tag 77 Step 4: Apply the Policy Tag to Some APs 78 Configuring a WLAN on an AireOS WLC 79 Step 1: Create a Dynamic Interface 79 Step 2: Create a New WLAN 80 Step 3: Configure the WLAN 81 Configuring WLAN Security 83 Configuring WLAN QoS 85 Configuring Advanced WLAN Settings 85 Finalizing WLAN Configuration 86 Chapter Review 87 Part I Review 88 Part II IP Access Control Lists 91 Chapter 5 Introduction to TCP/IP Transport and Applications 92 Do I Know This Already? Quiz 92 Foundation Topics 94 TCP/IP Layer 4 Protocols: TCP and UDP 94 Transmission Control Protocol 95 Multiplexing Using TCP Port Numbers 95 Popular TCP/IP Applications 98 Connection Establishment and Termination 100 Error Recovery and Reliability 101 Flow Control Using Windowing 102 User Datagram Protocol 103 TCP/IP Applications 104 Uniform Resource Identifiers 104 Finding the Web Server Using DNS 105 Transferring Files with HTTP 108 How the Receiving Host Identifies the Correct Receiving Application 109 HTTP Versions 110 HTTP 1.0 and 1.1 110 HTTP/2 and TLS 110 HTTP 3.0 111 Chapter Review 112 Chapter 6 Basic IPv4 Access Control Lists 114 Do I Know This Already? Quiz 114 Foundation Topics 116 IPv4 Access Control List Basics 116 ACL Location and Direction 116 Matching Packets 117 Taking Action When a Match Occurs 118 Types of IP ACLs 118 Standard Numbered IPv4 ACLs 119 List Logic with IP ACLs 119 Matching Logic and Command Syntax 121 Matching the Exact IP Address 121 Matching a Subset of the Address with Wildcard Masks 122 Binary Wildcard Masks 123 Finding the Right Wildcard Mask to Match a Subnet 124 Matching Any/All Addresses 124 Implementing Standard IP ACLs 125 Standard Numbered ACL Scenario 1 125 Standard Numbered ACL Scenario 2 127 Troubleshooting and Verification Tips 129 Practice Applying Standard IP ACLs 130 Practice Building access-list Commands 130 Reverse Engineering from ACL to Address Range 131 Chapter Review 133 Chapter 7 Named and Extended IP ACLs 136 Do I Know This Already? Quiz 136 Foundation Topics 138 Named ACLs and ACL Editing 138 Named IP Access Lists 138 Editing ACLs 140 Editing Named ACLs 140 Editing Numbered ACLs 143 Extended IP Access Control Lists 144 Matching the Protocol, Source IP, and Destination IP 145 Matching TCP and UDP Port Numbers 147 Extended IP ACL Configuration 150 Extended IP ACL Example 1: Packets to Web Servers 151 Extended IP ACL Example 2: Packets from Web Servers 153 Adjusting ACLs for HTTP/3 154 Practice Building access-list Commands 155 ACL Implementation Considerations 156 Chapter Review 157 Chapter 8 Applied IP ACLs 160 Do I Know This Already? Quiz 160 Foundation Topics 162 ACLs and Network Infrastructure Protocols 162 Filtering DNS 163 Filtering ICMP 164 Filtering OSPF 165 Filtering DHCP 167 Filtering SSH and Telnet 169 Filtering for End User SSH/Telnet 169 Filtering for Router VTY Access 171 Comparing ACLs in IOS and IOS XE 173 Configuration Syntax and Show Commands 173 Resequencing ACL Sequence Numbers 174 Using a Second (Common) Interface ACL 175 Matching Multiple Nonconsecutive Ports with eq 177 Chapter Review 177 Part II Review 180 Part III Security Services 183 Chapter 9 Security Architectures 184 Do I Know This Already? Quiz 184 Foundation Topics 186 Security Terminology 186 Common Security Threats 188 Attacks That Spoof Addresses 188 Denial-of-Service Attacks 189 Reflection and Amplification Attacks 191 Man-in-the-Middle Attacks 191 Address Spoofing Attack Summary 193 Reconnaissance Attacks 193 Buffer Overflow Attacks 194 Malware 194 Human Vulnerabilities 195 Password Vulnerabilities 196 Password Alternatives 196 Controlling and Monitoring User Access 198 Developing a Security Program to Educate Users 200 Chapter Review 201 Chapter 10 Securing Network Devices 202 Do I Know This Already? Quiz 202 Foundation Topics 204 Securing IOS Passwords 204 Encrypting Older IOS Passwords with service password-encryption 205 Encoding the Enable Passwords with Hashes 206 Interactions Between Enable Password and Enable Secret 206 Making the Enable Secret Truly Secret with a Hash 207 Improved Hashes for Ciscos Enable Secret 209 Encoding the Passwords for Local Usernames 210 Firewalls and Intrusion Prevention Systems 211 Traditional Firewalls 211 Security Zones 213 Intrusion Prevention Systems (IPS) 215 Cisco Next-Generation Firewalls 216 Cisco Next-Generation IPS 218 Chapter Review 219 Chapter 11 Implementing Switch Port Security 222 Do I Know This Already? Quiz 222 Foundation Topics 224 Port Security Concepts and Configuration 224 Configuring Port Security 225 Verifying Port Security 228 Port Security MAC Addresses 229 Port Security Violation Modes 230 Port Security Shutdown Mode 231 Port Security Protect and Restrict Modes 233 Chapter Review 235 Chapter 12 DHCP Snooping and ARP Inspection 238 Do I Know This Already? Quiz 238 Foundation Topics 240 DHCP Snooping 240 DHCP Snooping Concepts 240 A Sample Attack: A Spurious DHCP Server 241 DHCP Snooping Logic 242 Filtering DISCOVER Messages Based on MAC Address 243 Filtering Messages That Release IP Addresses 244 DHCP Snooping Configuration 245 Configuring DHCP Snooping on a Layer 2 Switch 246 Limiting DHCP Message Rates 248 DHCP Snooping Configuration Summary 249 Dynamic ARP Inspection 250 DAI Concepts 250 Review of Normal IP ARP 250 Gratuitous ARP as an Attack Vector 251 Dynamic ARP Inspection Logic 253 Dynamic ARP Inspection Configuration 254 Configuring ARP Inspection on a Layer 2 Switch 254 Limiting DAI Message Rates 257 Configuring Optional DAI Message Checks 258 IP ARP Inspection Configuration Summary 259 Chapter Review 260 Part III Review 264 Part IV IP Services 267 Chapter 13 Device Management Protocols 268 Do I Know This Already? Quiz 268 Foundation Topics 270 System Message Logging (Syslog) 270 Sending Messages in Real Time to Current Users 270 Storing Log Messages for Later Review 271 Log Message Format 272 Log Message Severity Levels 272 Configuring and Verifying System Logging 273 The debug Command and Log Messages 276 Network Time Protocol (NTP) 277 Setting the Time and Time Zone 278 Basic NTP Configuration 279 NTP Reference Clock and Stratum 281 Analyzing Topology Using CDP and LLDP 283 Examining Information Learned by CDP 283 Configuring and Verifying CDP 286 Examining Information Learned by LLDP 287 Configuring and Verifying LLDP 290 LLDP-MED and TLVs 292 Chapter Review 293 Chapter 14 Network Address Translation 298 Do I Know This Already? Quiz 298 Foundation Topics 300 Network Address Translation Concepts 300 IPv4 Address Conservation with NAT 300 Inside Source NAT 302 Static NAT 303 Inside Local and Inside Global Addresses 303 Dynamic NAT 304 Overloading NAT with Port Address Translation 306 NAT Configuration and Troubleshooting 307 Static NAT Configuration 308 Dynamic NAT Configuration 310 Dynamic NAT Verification 312 NAT Overload (PAT) Configuration 314 NAT Troubleshooting 317 Chapter Review 318 Chapter 15 Quality of Service (QoS) 322 Do I Know This Already? Quiz 322 Foundation Topics 324 Introduction to QoS 324 QoS: Managing Bandwidth, Delay, Jitter, and Loss 324 Types of Traffic 325 Data Applications 325 Voice and Video Applications 327 QoS as Mentioned in This Book 328 QoS on Switches and Routers 329 Classification and Marking 329 Classification Basics 329 Matching (Classification) Basics 330 Classification on Routers with ACLs and NBAR 331 Marking IP DSCP and Ethernet CoS 332 Marking the IP Header 333 Marking the Ethernet 802.1Q Header 333 Other Marking Fields 334 Defining Trust Boundaries 334 DiffServ Suggested Marking Values 335 Expedited Forwarding (EF) 336 Assured Forwarding (AF) 336 Class Selector (CS) 336 Guidelines for DSCP Marking Values 337 Queuing 337 Round-Robin Scheduling (Prioritization) 338 Low Latency Queuing 339 A Prioritization Strategy for Data, Voice, and Video 341 Shaping and Policing 341 Policing 342 Where to Use Policing 342 Shaping 344 Setting a Good Shaping Time Interval for Voice and Video 345 Congestion Avoidance 346 TCP Windowing Basics 346 Congestion Avoidance Tools 347 Chapter Review 348 Chapter 16 First Hop Redundancy Protocols 350 Do I Know This Already? Quiz 350 Foundation Topics 352 First Hop Redundancy Protocols 352 The Need for Redundancy in Networks 353 The Need for a First Hop Redundancy Protocol 354 The Three Solutions for First-Hop Redundancy 356 Hot Standby Router Protocol 356 HSRP Virtual IP and MAC Addresses 357 HSRP Failover 357 HSRP Load Balancing 359 HSRP Interface Tracking 359 HSRP Recovery and Preemption 360 HSRP Versions 361 VRRP and GLBP Concepts 362 Virtual Router Redundancy Protocol (VRRP) 362 GLBP Concepts 363 Similarities of GLBP, HSRP, and VRRP 363 GLBP Active/Active Load Balancing 364 Chapter Review 366 Chapter 17 SNMP, FTP, and TFTP 368 Do I Know This Already? Quiz 368 Foundation Topics 370 Simple Network Management Protocol 370 SNMP Variable Reading and Writing: SNMP Get and Set 371 SNMP Notifications: Traps and Informs 372 The Management Information Base 372 Securing SNMP 374 FTP and TFTP 376 Managing Cisco IOS Images with FTP/TFTP 376 The IOS File System 376 Upgrading IOS Images 378 Copying a New IOS Image to a Local IOS File System Using TFTP 378 Listing the Files in the IOS File System 379 Verifying IOS Code Integrity with MD5 or SHA512 381 Copying Images with FTP 382 The FTP and TFTP Protocols 384 FTP Protocol Basics 384 FTP Active and Passive Modes 385 TFTP Protocol Basics 387 Chapter Review 388 Part IV Review 392 Part V Network Architecture 395 Chapter 18 LAN Architecture 396 Do I Know This Already? Quiz 396 Foundation Topics 398 Analyzing Campus LAN Topologies 398 Two-Tier Campus Design (Collapsed Core) 399 Three-Tier Campus Design (Core) 400 Topology Design Terminology 402 Ethernet Physical Media and Standards 403 Ethernet UTP Links at the Access Layer 403 Multigig Ethernet on CAT 5E Cabling 405 Fiber Uplinks 406 Small Office/Home Office 407 Power over Ethernet (PoE) 408 PoE Basics 409 PoE Operation 409 PoE and LAN Design 411 Chapter Review 412 Chapter 19 WAN Architecture 414 Do I Know This Already? Quiz 414 Foundation Topics 416 Metro Ethernet 416 Metro Ethernet Physical Design and Topology 416 Ethernet WAN Services and Topologies 418 Ethernet Line Service (Point-to-Point) 418 Ethernet LAN Service (Full Mesh) 419 Layer 3 Design Using Metro Ethernet 420 Layer 3 Design with E-Line Service 420 Layer 3 Design with E-LAN Service 421 Multiprotocol Label Switching (MPLS) 422 MPLS VPN Physical Design and Topology 423 Layer 3 with MPLS VPN 424 Internet VPNs 425 Internet Access 426 Digital Subscriber Line 426 Cable Internet 427 Wireless WAN (4G, 5G) 428 Fiber (Ethernet) Internet Access 429 Internet VPN Fundamentals 430 Site-to-Site VPNs with IPsec 431 Remote Access VPNs with IPsec 433 Remote Access VPNs with TLS 434 Chapter Review 435 Chapter 20 Cloud Architecture 438 Do I Know This Already? Quiz 438 Foundation Topics 440 Server Virtualization 440 Cisco Server Hardware 440 Server Virtualization and Virtual Machine Basics 441 Networking with Virtual Switches on a Virtualized Host 443 Software Containers 444 The Physical Data Center Network 446 Workflow with a Virtualized Data Center 446 Cloud Computing Services 448 Private Cloud (On-Premise) 449 Public Cloud 450 Cloud and the As a Service Model 451 Infrastructure as a Service 451 Software as a Service 452 (Development) Platform as a Service 453 Virtual Routing and Forwarding (VRF) Instances 454 WAN Traffic Paths to Reach Cloud Services 456 Enterprise WAN Connections to Public Cloud 456 Accessing Public Cloud Services Using the Internet 456 Pros and Cons with Connecting to Public Cloud with Internet 457 Private WAN and Internet VPN Access to Public Cloud 458 Pros and Cons of Connecting to Cloud with Private WANs 459 Intercloud Exchanges 459 Summarizing the Pros and Cons of Public Cloud WAN Options 460 Understanding Cloud Management 460 Chapter Review 465 Part V Review 466 Part VI Network Automation 469 Chapter 21 Introduction to Controller-Based Networking 470 Do I Know This Already? Quiz 471 Foundation Topics 472 SDN and Controller-Based Networks 472 The Data, Control, and Management Planes 472 The Data Plane 473 The Control Plane 474 The Management Plane 475 Cisco Switch Data Plane Internals 475 Controllers and Software Defined Architecture 477 Controllers and Centralized Control 477 The Southbound Interface 478 The Northbound Interface 479 Software Defined Architecture Summary 481 Examples of Network Programmability and SDN 481 OpenDaylight and OpenFlow 481 The OpenDaylight Controller 482 The Cisco Open SDN Controller (OSC) 483 Cisco Application Centric Infrastructure (ACI) 484 ACI Physical Design: Spine and Leaf 484 ACI Operating Model with Intent-Based Networking 486 Summary of the SDN Examples 488 Comparing Traditional Versus Controller-Based Networks 488 How Automation Impacts Network Management 489 Comparing Traditional Networks with Controller-Based Networks 491 Chapter Review 492 Chapter 22 Cisco Software-Defined Access (Cisco SD-Access) 494 Do I Know This Already? Quiz 495 Foundation Topics 496 Cisco SD-Access Fabric, Underlay, and Overlay 496 The Cisco SD-Access Underlay 499 Using Existing Gear for the Cisco SD-Access Underlay 499 Using New Gear for the Cisco SD-Access Underlay 501 The Cisco SD-Access Overlay 503 VXLAN Tunnels in the Overlay (Data Plane) 504 LISP for Overlay Discovery and Location (Control Plane) 505 Cisco Catalyst Center and Cisco SD-Access Operation 509 Cisco Catalyst Center 509 Cisco Catalyst Center and Scalable Groups 510 Issues with Traditional IP-Based Security 511 Cisco SD-Access Security Is Based on User Groups 512 Cisco Catalyst Center as a Network Management Platform 514 Cisco Catalyst Center Similarities to Traditional Management 515 Cisco Catalyst Center and Differences with Traditional Management 516 Artificial Intelligence (AI), Machine Learning (ML), and Operational Management 517 Chapter Review 524 Chapter 23 Understanding REST and JSON 526 Do I Know This Already? Quiz 526 Foundation Topics 528 REST-Based APIs 528 REST-Based (RESTful) APIs 528 Client/Server Architecture 529 Stateless Operation 530 Cacheable (or Not) 530 Background: Data and Variables 530 Simple Variables 530 List and Dictionary Variables 531 REST APIs and HTTP 533 Software CRUD Actions and HTTP Verbs 533 Using URIs with HTTP to Specify the Resource 534 Example of REST API Call to Cisco Catalyst Center 536 Data Serialization and JSON 541 The Need for a Data Model with APIs 542 Data Serialization Languages 544 JSON 544 XML 544 YAML 545 Summary of Data Serialization 546 Recognizing the Components of JSON 546 Interpreting JSON Key:Value Pairs 547 Interpreting JSON Objects and Arrays 547 Minified and Beautified JSON 550 Chapter Review 550 Chapter 24 Understanding Ansible and Terraform 552 Do I Know This Already? Quiz 552 Foundation Topics 554 Device Configuration Challenges and Solutions 554 Configuration Drift 554 Centralized Configuration Files and Version Control 555 Configuration Monitoring and Enforcement 557 Configuration Provisioning 558 Configuration Templates and Variables 559 Files That Control Configuration Automation 561 Ansible and Terraform Basics 562 Ansible 562 Terraform 563 Summary of Configuration Management Tools 565 Chapter Review 566 Part VI Review 568 Part VII Exam Updates and Final Review 571 Chapter 25 CCNA 200-301 Official Cert Guide, Volume 2, Second Edition, Exam Updates 572 The Purpose of This Chapter 572 Additional Technical Content 573 Official Blueprint Changes 573 Impact on You and Your Study Plan 575 News About the Next CCNA Exam Release 576 Updated Technical Content 576 Chapter 26 Final Review 578 Advice About the Exam Event 578 Learn About Question Types 578 Think About Your Time Budget 581 An Example Time-Check Method 581 One Week Before Your Exam 582 24 Hours Before Your Exam 582 30 Minutes Before Your Exam 583 The Hour After Your Exam 583 Exam Review 584 Using Practice Questions 585 Hold Practice Exam Events 586 Exam Scoring on the Real Exam 587 Self-Assessment Suggestions 587 Gap Analysis Using Q&A 589 Advice on How to Answer Exam Questions 590 Additional Exams with the Premium Edition 592 Practicing CLI Skills 593 Adjustments for Your Second Attempt 595 Other Study Tasks 596 Final Thoughts 596 Part VIII Print Appendixes 599 Appendix A Numeric Reference Tables 601 Appendix B Exam Topics Cross-Reference 607 Appendix C Answers to the Do I Know This Already? Quizzes 619 Glossary 641 Online Appendixes Appendix D Topics from Previous Editions Appendix E Practice for Chapter 6: Basic IPv4 Access Control Lists Appendix F Study Planner Glossary 9780138214951 TOC 5/29/2024
Introduction xxxi Part I Wireless LANs 3 Chapter 1 Fundamentals of Wireless Networks 4 Do I Know This Already? Quiz 4 Foundation Topics 6 Comparing Wired and Wireless Networks 6 Wireless LAN Topologies 7 Basic Service Set 8 Distribution System 10 Extended Service Set 12 Independent Basic Service Set 13 Other Wireless Topologies 14 Repeater 14 Workgroup Bridge 15 Outdoor Bridge 16 Mesh Network 17 Wireless Bands and Channels 17 Chapter Review 20 Chapter 2 Analyzing Cisco Wireless Architectures 22 Do I Know This Already? Quiz 22 Foundation Topics 24 Autonomous AP Architecture 24 Cloud-based AP Architecture 26 Split-MAC Architectures 28 Comparing Cisco Wireless LAN Controller Deployments 32 Cisco AP Modes 35 FlexConnect Mode 36 Chapter Review 37 Chapter 3 Securing Wireless Networks 40 Do I Know This Already? Quiz 40 Foundation Topics 42 Anatomy of a Secure Connection 42 Authentication 43 Message Privacy 44 Message Integrity 45 Wireless Client Authentication Methods 46 Open Authentication 46 WEP 47 802.1x/EAP 47 LEAP 48 EAP-FAST 49 PEAP 49 EAP-TLS 50 Wireless Privacy and Integrity Methods 50 TKIP 50 CCMP 51 GCMP 51 WPA, WPA2, and WPA3 51 Chapter Review 53 Chapter 4 Building a Wireless LAN 56 Do I Know This Already? Quiz 56 Foundation Topics 58 Connecting a Cisco AP 58 Accessing a Cisco WLC 59 Connecting a Cisco WLC 63 WLC Physical Ports 63 Configuring a WLAN 65 Configuring a WLAN on an IOS-XE WLC 67 Step 1: Configure a WLAN Profile 69 Step 2: Configure a Policy Profile 74 Step 3: Map the WLAN and Policy Profiles to a Policy Tag 77 Step 4: Apply the Policy Tag to Some APs 78 Configuring a WLAN on an AireOS WLC 79 Step 1: Create a Dynamic Interface 79 Step 2: Create a New WLAN 80 Step 3: Configure the WLAN 81 Configuring WLAN Security 83 Configuring WLAN QoS 85 Configuring Advanced WLAN Settings 85 Finalizing WLAN Configuration 86 Chapter Review 87 Part I Review 88 Part II IP Access Control Lists 91 Chapter 5 Introduction to TCP/IP Transport and Applications 92 Do I Know This Already? Quiz 92 Foundation Topics 94 TCP/IP Layer 4 Protocols: TCP and UDP 94 Transmission Control Protocol 95 Multiplexing Using TCP Port Numbers 95 Popular TCP/IP Applications 98 Connection Establishment and Termination 100 Error Recovery and Reliability 101 Flow Control Using Windowing 102 User Datagram Protocol 103 TCP/IP Applications 104 Uniform Resource Identifiers 104 Finding the Web Server Using DNS 105 Transferring Files with HTTP 108 How the Receiving Host Identifies the Correct Receiving Application 109 HTTP Versions 110 HTTP 1.0 and 1.1 110 HTTP/2 and TLS 110 HTTP 3.0 111 Chapter Review 112 Chapter 6 Basic IPv4 Access Control Lists 114 Do I Know This Already? Quiz 114 Foundation Topics 116 IPv4 Access Control List Basics 116 ACL Location and Direction 116 Matching Packets 117 Taking Action When a Match Occurs 118 Types of IP ACLs 118 Standard Numbered IPv4 ACLs 119 List Logic with IP ACLs 119 Matching Logic and Command Syntax 121 Matching the Exact IP Address 121 Matching a Subset of the Address with Wildcard Masks 122 Binary Wildcard Masks 123 Finding the Right Wildcard Mask to Match a Subnet 124 Matching Any/All Addresses 124 Implementing Standard IP ACLs 125 Standard Numbered ACL Scenario 1 125 Standard Numbered ACL Scenario 2 127 Troubleshooting and Verification Tips 129 Practice Applying Standard IP ACLs 130 Practice Building access-list Commands 130 Reverse Engineering from ACL to Address Range 131 Chapter Review 133 Chapter 7 Named and Extended IP ACLs 136 Do I Know This Already? Quiz 136 Foundation Topics 138 Named ACLs and ACL Editing 138 Named IP Access Lists 138 Editing ACLs 140 Editing Named ACLs 140 Editing Numbered ACLs 143 Extended IP Access Control Lists 144 Matching the Protocol, Source IP, and Destination IP 145 Matching TCP and UDP Port Numbers 147 Extended IP ACL Configuration 150 Extended IP ACL Example 1: Packets to Web Servers 151 Extended IP ACL Example 2: Packets from Web Servers 153 Adjusting ACLs for HTTP/3 154 Practice Building access-list Commands 155 ACL Implementation Considerations 156 Chapter Review 157 Chapter 8 Applied IP ACLs 160 Do I Know This Already? Quiz 160 Foundation Topics 162 ACLs and Network Infrastructure Protocols 162 Filtering DNS 163 Filtering ICMP 164 Filtering OSPF 165 Filtering DHCP 167 Filtering SSH and Telnet 169 Filtering for End User SSH/Telnet 169 Filtering for Router VTY Access 171 Comparing ACLs in IOS and IOS XE 173 Configuration Syntax and Show Commands 173 Resequencing ACL Sequence Numbers 174 Using a Second (Common) Interface ACL 175 Matching Multiple Nonconsecutive Ports with eq 177 Chapter Review 177 Part II Review 180 Part III Security Services 183 Chapter 9 Security Architectures 184 Do I Know This Already? Quiz 184 Foundation Topics 186 Security Terminology 186 Common Security Threats 188 Attacks That Spoof Addresses 188 Denial-of-Service Attacks 189 Reflection and Amplification Attacks 191 Man-in-the-Middle Attacks 191 Address Spoofing Attack Summary 193 Reconnaissance Attacks 193 Buffer Overflow Attacks 194 Malware 194 Human Vulnerabilities 195 Password Vulnerabilities 196 Password Alternatives 196 Controlling and Monitoring User Access 198 Developing a Security Program to Educate Users 200 Chapter Review 201 Chapter 10 Securing Network Devices 202 Do I Know This Already? Quiz 202 Foundation Topics 204 Securing IOS Passwords 204 Encrypting Older IOS Passwords with service password-encryption 205 Encoding the Enable Passwords with Hashes 206 Interactions Between Enable Password and Enable Secret 206 Making the Enable Secret Truly Secret with a Hash 207 Improved Hashes for Ciscos Enable Secret 209 Encoding the Passwords for Local Usernames 210 Firewalls and Intrusion Prevention Systems 211 Traditional Firewalls 211 Security Zones 213 Intrusion Prevention Systems (IPS) 215 Cisco Next-Generation Firewalls 216 Cisco Next-Generation IPS 218 Chapter Review 219 Chapter 11 Implementing Switch Port Security 222 Do I Know This Already? Quiz 222 Foundation Topics 224 Port Security Concepts and Configuration 224 Configuring Port Security 225 Verifying Port Security 228 Port Security MAC Addresses 229 Port Security Violation Modes 230 Port Security Shutdown Mode 231 Port Security Protect and Restrict Modes 233 Chapter Review 235 Chapter 12 DHCP Snooping and ARP Inspection 238 Do I Know This Already? Quiz 238 Foundation Topics 240 DHCP Snooping 240 DHCP Snooping Concepts 240 A Sample Attack: A Spurious DHCP Server 241 DHCP Snooping Logic 242 Filtering DISCOVER Messages Based on MAC Address 243 Filtering Messages That Release IP Addresses 244 DHCP Snooping Configuration 245 Configuring DHCP Snooping on a Layer 2 Switch 246 Limiting DHCP Message Rates 248 DHCP Snooping Configuration Summary 249 Dynamic ARP Inspection 250 DAI Concepts 250 Review of Normal IP ARP 250 Gratuitous ARP as an Attack Vector 251 Dynamic ARP Inspection Logic 253 Dynamic ARP Inspection Configuration 254 Configuring ARP Inspection on a Layer 2 Switch 254 Limiting DAI Message Rates 257 Configuring Optional DAI Message Checks 258 IP ARP Inspection Configuration Summary 259 Chapter Review 260 Part III Review 264 Part IV IP Services 267 Chapter 13 Device Management Protocols 268 Do I Know This Already? Quiz 268 Foundation Topics 270 System Message Logging (Syslog) 270 Sending Messages in Real Time to Current Users 270 Storing Log Messages for Later Review 271 Log Message Format 272 Log Message Severity Levels 272 Configuring and Verifying System Logging 273 The debug Command and Log Messages 276 Network Time Protocol (NTP) 277 Setting the Time and Time Zone 278 Basic NTP Configuration 279 NTP Reference Clock and Stratum 281 Analyzing Topology Using CDP and LLDP 283 Examining Information Learned by CDP 283 Configuring and Verifying CDP 286 Examining Information Learned by LLDP 287 Configuring and Verifying LLDP 290 LLDP-MED and TLVs 292 Chapter Review 293 Chapter 14 Network Address Translation 298 Do I Know This Already? Quiz 298 Foundation Topics 300 Network Address Translation Concepts 300 IPv4 Address Conservation with NAT 300 Inside Source NAT 302 Static NAT 303 Inside Local and Inside Global Addresses 303 Dynamic NAT 304 Overloading NAT with Port Address Translation 306 NAT Configuration and Troubleshooting 307 Static NAT Configuration 308 Dynamic NAT Configuration 310 Dynamic NAT Verification 312 NAT Overload (PAT) Configuration 314 NAT Troubleshooting 317 Chapter Review 318 Chapter 15 Quality of Service (QoS) 322 Do I Know This Already? Quiz 322 Foundation Topics 324 Introduction to QoS 324 QoS: Managing Bandwidth, Delay, Jitter, and Loss 324 Types of Traffic 325 Data Applications 325 Voice and Video Applications 327 QoS as Mentioned in This Book 328 QoS on Switches and Routers 329 Classification and Marking 329 Classification Basics 329 Matching (Classification) Basics 330 Classification on Routers with ACLs and NBAR 331 Marking IP DSCP and Ethernet CoS 332 Marking the IP Header 333 Marking the Ethernet 802.1Q Header 333 Other Marking Fields 334 Defining Trust Boundaries 334 DiffServ Suggested Marking Values 335 Expedited Forwarding (EF) 336 Assured Forwarding (AF) 336 Class Selector (CS) 336 Guidelines for DSCP Marking Values 337 Queuing 337 Round-Robin Scheduling (Prioritization) 338 Low Latency Queuing 339 A Prioritization Strategy for Data, Voice, and Video 341 Shaping and Policing 341 Policing 342 Where to Use Policing 342 Shaping 344 Setting a Good Shaping Time Interval for Voice and Video 345 Congestion Avoidance 346 TCP Windowing Basics 346 Congestion Avoidance Tools 347 Chapter Review 348 Chapter 16 First Hop Redundancy Protocols 350 Do I Know This Already? Quiz 350 Foundation Topics 352 First Hop Redundancy Protocols 352 The Need for Redundancy in Networks 353 The Need for a First Hop Redundancy Protocol 354 The Three Solutions for First-Hop Redundancy 356 Hot Standby Router Protocol 356 HSRP Virtual IP and MAC Addresses 357 HSRP Failover 357 HSRP Load Balancing 359 HSRP Interface Tracking 359 HSRP Recovery and Preemption 360 HSRP Versions 361 VRRP and GLBP Concepts 362 Virtual Router Redundancy Protocol (VRRP) 362 GLBP Concepts 363 Similarities of GLBP, HSRP, and VRRP 363 GLBP Active/Active Load Balancing 364 Chapter Review 366 Chapter 17 SNMP, FTP, and TFTP 368 Do I Know This Already? Quiz 368 Foundation Topics 370 Simple Network Management Protocol 370 SNMP Variable Reading and Writing: SNMP Get and Set 371 SNMP Notifications: Traps and Informs 372 The Management Information Base 372 Securing SNMP 374 FTP and TFTP 376 Managing Cisco IOS Images with FTP/TFTP 376 The IOS File System 376 Upgrading IOS Images 378 Copying a New IOS Image to a Local IOS File System Using TFTP 378 Listing the Files in the IOS File System 379 Verifying IOS Code Integrity with MD5 or SHA512 381 Copying Images with FTP 382 The FTP and TFTP Protocols 384 FTP Protocol Basics 384 FTP Active and Passive Modes 385 TFTP Protocol Basics 387 Chapter Review 388 Part IV Review 392 Part V Network Architecture 395 Chapter 18 LAN Architecture 396 Do I Know This Already? Quiz 396 Foundation Topics 398 Analyzing Campus LAN Topologies 398 Two-Tier Campus Design (Collapsed Core) 399 Three-Tier Campus Design (Core) 400 Topology Design Terminology 402 Ethernet Physical Media and Standards 403 Ethernet UTP Links at the Access Layer 403 Multigig Ethernet on CAT 5E Cabling 405 Fiber Uplinks 406 Small Office/Home Office 407 Power over Ethernet (PoE) 408 PoE Basics 409 PoE Operation 409 PoE and LAN Design 411 Chapter Review 412 Chapter 19 WAN Architecture 414 Do I Know This Already? Quiz 414 Foundation Topics 416 Metro Ethernet 416 Metro Ethernet Physical Design and Topology 416 Ethernet WAN Services and Topologies 418 Ethernet Line Service (Point-to-Point) 418 Ethernet LAN Service (Full Mesh) 419 Layer 3 Design Using Metro Ethernet 420 Layer 3 Design with E-Line Service 420 Layer 3 Design with E-LAN Service 421 Multiprotocol Label Switching (MPLS) 422 MPLS VPN Physical Design and Topology 423 Layer 3 with MPLS VPN 424 Internet VPNs 425 Internet Access 426 Digital Subscriber Line 426 Cable Internet 427 Wireless WAN (4G, 5G) 428 Fiber (Ethernet) Internet Access 429 Internet VPN Fundamentals 430 Site-to-Site VPNs with IPsec 431 Remote Access VPNs with IPsec 433 Remote Access VPNs with TLS 434 Chapter Review 435 Chapter 20 Cloud Architecture 438 Do I Know This Already? Quiz 438 Foundation Topics 440 Server Virtualization 440 Cisco Server Hardware 440 Server Virtualization and Virtual Machine Basics 441 Networking with Virtual Switches on a Virtualized Host 443 Software Containers 444 The Physical Data Center Network 446 Workflow with a Virtualized Data Center 446 Cloud Computing Services 448 Private Cloud (On-Premise) 449 Public Cloud 450 Cloud and the As a Service Model 451 Infrastructure as a Service 451 Software as a Service 452 (Development) Platform as a Service 453 Virtual Routing and Forwarding (VRF) Instances 454 WAN Traffic Paths to Reach Cloud Services 456 Enterprise WAN Connections to Public Cloud 456 Accessing Public Cloud Services Using the Internet 456 Pros and Cons with Connecting to Public Cloud with Internet 457 Private WAN and Internet VPN Access to Public Cloud 458 Pros and Cons of Connecting to Cloud with Private WANs 459 Intercloud Exchanges 459 Summarizing the Pros and Cons of Public Cloud WAN Options 460 Understanding Cloud Management 460 Chapter Review 465 Part V Review 466 Part VI Network Automation 469 Chapter 21 Introduction to Controller-Based Networking 470 Do I Know This Already? Quiz 471 Foundation Topics 472 SDN and Controller-Based Networks 472 The Data, Control, and Management Planes 472 The Data Plane 473 The Control Plane 474 The Management Plane 475 Cisco Switch Data Plane Internals 475 Controllers and Software Defined Architecture 477 Controllers and Centralized Control 477 The Southbound Interface 478 The Northbound Interface 479 Software Defined Architecture Summary 481 Examples of Network Programmability and SDN 481 OpenDaylight and OpenFlow 481 The OpenDaylight Controller 482 The Cisco Open SDN Controller (OSC) 483 Cisco Application Centric Infrastructure (ACI) 484 ACI Physical Design: Spine and Leaf 484 ACI Operating Model with Intent-Based Networking 486 Summary of the SDN Examples 488 Comparing Traditional Versus Controller-Based Networks 488 How Automation Impacts Network Management 489 Comparing Traditional Networks with Controller-Based Networks 491 Chapter Review 492 Chapter 22 Cisco Software-Defined Access (Cisco SD-Access) 494 Do I Know This Already? Quiz 495 Foundation Topics 496 Cisco SD-Access Fabric, Underlay, and Overlay 496 The Cisco SD-Access Underlay 499 Using Existing Gear for the Cisco SD-Access Underlay 499 Using New Gear for the Cisco SD-Access Underlay 501 The Cisco SD-Access Overlay 503 VXLAN Tunnels in the Overlay (Data Plane) 504 LISP for Overlay Discovery and Location (Control Plane) 505 Cisco Catalyst Center and Cisco SD-Access Operation 509 Cisco Catalyst Center 509 Cisco Catalyst Center and Scalable Groups 510 Issues with Traditional IP-Based Security 511 Cisco SD-Access Security Is Based on User Groups 512 Cisco Catalyst Center as a Network Management Platform 514 Cisco Catalyst Center Similarities to Traditional Management 515 Cisco Catalyst Center and Differences with Traditional Management 516 Artificial Intelligence (AI), Machine Learning (ML), and Operational Management 517 Chapter Review 524 Chapter 23 Understanding REST and JSON 526 Do I Know This Already? Quiz 526 Foundation Topics 528 REST-Based APIs 528 REST-Based (RESTful) APIs 528 Client/Server Architecture 529 Stateless Operation 530 Cacheable (or Not) 530 Background: Data and Variables 530 Simple Variables 530 List and Dictionary Variables 531 REST APIs and HTTP 533 Software CRUD Actions and HTTP Verbs 533 Using URIs with HTTP to Specify the Resource 534 Example of REST API Call to Cisco Catalyst Center 536 Data Serialization and JSON 541 The Need for a Data Model with APIs 542 Data Serialization Languages 544 JSON 544 XML 544 YAML 545 Summary of Data Serialization 546 Recognizing the Components of JSON 546 Interpreting JSON Key:Value Pairs 547 Interpreting JSON Objects and Arrays 547 Minified and Beautified JSON 550 Chapter Review 550 Chapter 24 Understanding Ansible and Terraform 552 Do I Know This Already? Quiz 552 Foundation Topics 554 Device Configuration Challenges and Solutions 554 Configuration Drift 554 Centralized Configuration Files and Version Control 555 Configuration Monitoring and Enforcement 557 Configuration Provisioning 558 Configuration Templates and Variables 559 Files That Control Configuration Automation 561 Ansible and Terraform Basics 562 Ansible 562 Terraform 563 Summary of Configuration Management Tools 565 Chapter Review 566 Part VI Review 568 Part VII Exam Updates and Final Review 571 Chapter 25 CCNA 200-301 Official Cert Guide, Volume 2, Second Edition, Exam Updates 572 The Purpose of This Chapter 572 Additional Technical Content 573 Official Blueprint Changes 573 Impact on You and Your Study Plan 575 News About the Next CCNA Exam Release 576 Updated Technical Content 576 Chapter 26 Final Review 578 Advice About the Exam Event 578 Learn About Question Types 578 Think About Your Time Budget 581 An Example Time-Check Method 581 One Week Before Your Exam 582 24 Hours Before Your Exam 582 30 Minutes Before Your Exam 583 The Hour After Your Exam 583 Exam Review 584 Using Practice Questions 585 Hold Practice Exam Events 586 Exam Scoring on the Real Exam 587 Self-Assessment Suggestions 587 Gap Analysis Using Q&A 589 Advice on How to Answer Exam Questions 590 Additional Exams with the Premium Edition 592 Practicing CLI Skills 593 Adjustments for Your Second Attempt 595 Other Study Tasks 596 Final Thoughts 596 Part VIII Print Appendixes 599 Appendix A Numeric Reference Tables 601 Appendix B Exam Topics Cross-Reference 607 Appendix C Answers to the Do I Know This Already? Quizzes 619 Glossary 641 Online Appendixes Appendix D Topics from Previous Editions Appendix E Practice for Chapter 6: Basic IPv4 Access Control Lists Appendix F Study Planner Glossary 9780138214951 TOC 5/29/2024
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