This is the eBook edition of the Cisco Certified DevNet Associate DEVASC 200-901 Official Cert Guide. This eBook does not include access to the companion website with practice exam that comes with the print edition. Access to the video mentoring is available through product registration at Cisco Press; or see the instructions in the back pages of your eBook. Trust the best-selling Official Cert Guide series from Cisco Press to help you learn, prepare, and practice for exam success. They are built with the objective of providing assessment, review, and practice to help ensure you are fully prepared for your certification exam. • Master Cisco Certified DevNet Associate DEVASC 200-901 exam topics • Assess your knowledge with chapter-opening quizzes • Review key concepts with exam preparation tasks • Learn from more than two hours of video mentoring Cisco Certified DevNet Associate DEVASC 200-901 Official Cert Guide presents you with an organized test preparation routine through the use of 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. Cisco Certified DevNet Associate DEVASC 200-901 Official Cert Guide focuses specifically on the objectives for the Cisco Certified DevNet Associate DEVASC exam. Four leading Cisco technology experts share preparation hints and test-taking tips, helping you identify areas of weakness and improve both your conceptual knowledge and hands-on skills. Material is presented in a concise manner, focusing on increasing your understanding and retention of exam topics. Well regarded for its level of detail, assessment features, comprehensive design scenarios, this official study guide helps you master the concepts and techniques that will enable you to succeed on the exam the first time. The official study guide helps you master all the topics on the Cisco Certified DevNet Associate DEVASC 200-901 exam, including: • Software Development and Design • Understanding and Using APIs • Cisco Platforms and Development • Application Deployment and Security • Infrastructure and Automation • Network Fundamentals
Introduction xxv Chapter 1 Introduction to Cisco DevNet Associate Certification 2 Do I Know This Already? 2 Foundation Topics 3 Why Get Certified 3 Cisco Career Certification Overview 6 Cisco DevNet Certifications 11 Cisco Certified DevNet Associate Certification (DEVASC) 12 Cisco Certified DevNet Professional Certification 13 Cisco DevNet Overview 14 Discover 15 Technologies 15 Community 16 Support 17 Events 17 DevNet Automation Exchange 18 Summary 20 Chapter 2 Software Development and Design 22 Do I Know This Already? Quiz 22 Foundation Topics 25 Software Development Lifecycle 25 Waterfall 27 Lean 28 Agile 29 Common Design Patterns 30 Model-View-Controller (MVC) Pattern 30 Observer Pattern 31 Linux BASH 32 Getting to Know BASH 32 Directory Navigation 35 cd 35 pwd 35 ls 36 mkdir 36 File Management 36 mv 37 rm 37 touch 37 cat 37 Environment Variables 37 Software Version Control 38 Git 39 Understanding Git 40 Using Git 42 Cloning/Initiating Repositories 42 Adding and Removing Files 43 Committing Files 45 Pushing and Pulling Files 45 Working with Branches 47 Merging Branches 50 Handling Conflicts 52 Comparing Commits with diff 53 Conducting Code Review 55 Exam Preparation Tasks 55 Review All Key Topics 56 Define Key Terms 56 Chapter 3 Introduction to Python 58 Do I Know This Already? Quiz 58 Foundation Topics 60 Getting Started with Python 60 Understanding Python Syntax 63 Data Types and Variables 66 Variables 66 Data Types 67 Integers, Floating Point, and Complex Numbers 68 Booleans 70 Strings 70 Lists 72 Tuples 74 Dictionaries 75 Sets 76 Input and Output 77 Getting Input from the User 77 The Mighty print() Function 77 Flow Control with Conditionals and Loops 78 If Statements 79 For Loops 80 While Loops 82 Exam Preparation Tasks 83 Review All Key Topics 83 Define Key Terms 84 Additional Resources 84 Chapter 4 Python Functions, Classes, and Modules 86 Do I Know This Already? Quiz 86 Foundation Topics 88 Python Functions 88 Using Arguments and Parameters 89 Object-Oriented Programming and Python 91 Python Classes 92 Creating a Class 92 Methods 93 Inheritance 94 Working with Python Modules 96 Importing a Module 97 The Python Standard Library 99 Importing Your Own Modules 100 Useful Python Modules for Cisco Infrastructure 101 Exam Preparation Tasks 104 Review All Key Topics 104 Define Key Terms 105 Chapter 5 Working with Data in Python 106 Do I Know This Already? Quiz 106 Foundation Topics 108 File Input and Output 108 Parsing Data 110 Comma-Separated Values (CSV) 110 JavaScript Object Notation (JSON) 113 Extensible Markup Language (XML) 115 YAML Ain't Markup Language (YAML) 117 Error Handling in Python 119 Test-Driven Development 121 Unit Testing 122 Exam Preparation Tasks 126 Review All Key Topics 126 Define Key Terms 127 Additional Resources 127 Chapter 6 Application Programming Interfaces (APIs) 128 Do I Know This Already? Quiz 128 Foundation Topics 130 Application Programming Interfaces (APIs) 130 Northbound APIs 130 Southbound APIs 130 Synchronous Versus Asynchronous APIs 131 Representational State Transfer (REST) APIs 132 RESTful API Authentication 133 Basic Authentication 134 API Keys 134 Custom Tokens 135 Simple Object Access Protocol (SOAP) 136 Remote-Procedure Calls (RPCs) 140 Exam Preparation Tasks 142 Review All Key Topics 142 Define Key Terms 142 Chapter 7 RESTful API Requests and Responses 144 Do I Know This Already? Quiz 144 Foundation Topics 146 RESTful API Fundamentals 146 API Types 146 API Access Types 147 HTTP Basics 148 Uniform Resource Locator (URL) 149 Method 150 REST Methods and CRUD 150 Deep Dive into GET and POST 151 HTTP Headers 152 Request Headers 153 Response Headers 153 Response Codes 154 XML 155 JSON 156 YAML 157 Webhooks 158 Tools Used When Developing with Webhooks 158 Sequence Diagrams 159 REST Constraints 160 Client/Server 160 Stateless 161 Cache 161 Uniform Interface 161 Layered System 162 Code on Demand 162 REST API Versioning 162 Pagination 162 Rate Limiting and Monetization 163 Rate Limiting on the Client Side 164 REST Tools 164 Postman 165 curl 168 HTTPie 169 Python Requests 171 REST API Debugging Tools for Developing APIs 172 Exam Preparation Tasks 172 Review All Key Topics 172 Define Key Terms 173 Chapter 8 Cisco Enterprise Networking Management Platforms and APIs 174 Do I Know This Already? Quiz 174 Foundation Topics 176 What Is an SDK? 176 Cisco Meraki 178 Cisco DNA Center 189 Cisco SD-WAN 201 Exam Preparation Tasks 212 Review All Key Topics 212 Define Key Terms 212 Chapter 9 Cisco Data Center and Compute Management Platforms and APIs 214 Do I Know This Already? Quiz 214 Foundation Topics 216 Cisco ACI 216 Building Blocks of Cisco ACI Fabric Policies 220 APIC REST API 223 UCS Manager 230 Cisco UCS Director 239 Cisco Intersight 246 Exam Preparation Tasks 252 Review All Key Topics 252 Define Key Terms 253 Chapter 10 Cisco Collaboration Platforms and APIs 254 Do I Know This Already? Quiz 255 Foundation Topics 257 Introduction to the Cisco Collaboration Portfolio 257 Unified Communications 257 Cisco Webex Teams 258 Cisco Unified Communications Manager (Unified CM) 259 Unified Contact Center 259 Cisco Webex 260 Cisco Collaboration Endpoints 260 API Options in the Cisco Collaboration Portfolio 261 Webex Teams API 261 API Authentication 262 Personal Access Tokens 262 Integrations 263 Bots 271 Guest Issuer 272 Webex Teams SDKs 273 Cisco Finesse 274 Cisco Finesse API 275 API Authentication 276 Finesse User APIs 277 Finesse Team APIs 279 Dialog APIs 279 Finesse Gadgets 281 Webex Meetings APIs 281 Authentication 283 Integration API Keys 283 Webex XML APIs 284 Creating a New Meeting 284 Listing All My Meetings Meeting 286 Setting or Modifying Meeting Attributes 287 Deleting a Meeting 288 Webex Devices 289 xAPI 290 xAPI Authentication 290 xAPI Session Authentication 291 Creating a Session 291 Getting the Current Device Status 291 Setting Device Attributes 292 Registering an Event Notification Webhook 293 Room Analytics People Presence Detector 294 Cisco Unified Communications Manager 294 Administrative XML 294 Cisco AXL Toolkit 295 Accessing the AXL SOAP API 296 Using the Zeep Client Library 296 Using the CiscoAXL SDK 297 Exam Preparation Tasks 298 Review All Key Topics 298 Define Key Terms 298 Chapter 11 Cisco Security Platforms and APIs 300 Do I Know This Already? Quiz 301 Foundation Topics 302 Cisco's Security Portfolio 302 Potential Threats and Vulnerabilities 303 Most Common Threats 303 Cisco Umbrella 304 Understanding Umbrella 304 Cisco Umbrella APIs 305 Authentication 306 Cisco Firepower 314 Firepower Management Center APIs 315 Cisco Advanced Malware Protection (AMP) 320 Listing All Computers 323 Listing All Vulnerabilities 323 Cisco Identity Services Engine (ISE) 326 ISE REST APIs 327 ERS API Authentication 328 Creating an Endpoint Group 329 Creating an Endpoint and Adding It to a Group 330 Other ISE APIs 331 Cisco Threat Grid 331 Threat Grid APIs 332 Threat Grid API Format 332 API Keys 333 Who Am I 333 The Data, Sample, and IOC APIs 334 Feeds 335 Exam Preparation Tasks 337 Review All Key Topics 337 Define Key Terms 338 Chapter 12 Model-Driven Programmability 340 Do I Know This Already? Quiz 340 Foundation Topics 342 NETCONF 343 YANG 347 RESTCONF 367 Model-Driven Telemetry 371 Exam Preparation Tasks 372 Review All Key Topics 372 Define Key Terms 372 Chapter 13 Deploying Applications 374 Do I Know This Already? Quiz 374 Foundation Topics 376 Application Deployment Models 376 NIST Definition 376 Essential Characteristics 377 Service Models 378 Application Deployment Options 379 Private Cloud 379 Public Cloud 379 Hybrid Cloud 380 Community Cloud 381 Edge and Fog Computing 381 Application Deployment Methods 382 Bare-Metal Application Deployment 382 Virtualized Applications 383 Cloud-Native Applications 384 Containerized Applications 384 Serverless 386 DevOps 388 What Is DevOps? 390 Putting DevOps into Practice: The Three Ways 391 First Way: Systems and Flow 391 Second Way: Feedback Loop 392 Third Way: Continuous Experimentation and Learning 393 DevOps Implementation 394 Docker 398 Understanding Docker 398 Namespaces 398 Cgroups 399 Union File System 399 Docker Architecture 400 Using Docker 401 Working with Containers 403 Dockerfiles 410 Docker Images 411 Docker Hub 414 Exam Preparation Tasks 419 Review All Key Topics 419 Define Key Terms 419 Additional Resources 419 Chapter 14 Application Security 420 Do I Know This Already? Quiz 420 Foundation Topics 422 Identifying Potential Risks 422 Common Threats and Mitigations 423 Open Web Application Security Project 424 Using Nmap for Vulnerability Scanning 426 Basic Nmap Scan Against an IP Address or a Host 427 CVE Detection Using Nmap 427 Protecting Applications 429 Tiers of Securing and Protecting 430 Encryption Fundamentals 431 Public Key Encryption 431 Data Integrity (One-Way Hash) 432 Digital Signatures 432 Data Security 433 Secure Development Methods 434 Securing Network Devices 437 Firewalls 437 Intrusion Detection Systems (IDSs) 439 Intrusion Prevention Systems (IPSs) 440 Domain Name System (DNS) 440 Load Balancing 443 Exam Preparation Tasks 446 Review All Key Topics 446 Define Key Terms 447 Chapter 15 Infrastructure Automation 448 Do I Know This Already? Quiz 449 Foundation Topics 451 Controller Versus Device-Level Management 451 Infrastructure as Code 454 Continuous Integration/Continuous Delivery Pipelines 455 Automation Tools 458 Ansible 458 Puppet 462 Chef 465 Cisco Network Services Orchestrator (NSO) 467 Cisco Modeling Labs/Cisco Virtual Internet Routing Laboratory (CML/VIRL) 474 Python Automated Test System (pyATS) 476 Exam Preparation Tasks 479 Review All Key Topics 479 Define Key Terms 480 Chapter 16 Network Fundamentals 482 Do I Know This Already? Quiz 482 Foundation Topics 484 Network Reference Models 484 The OSI Model 484 The TCP/IP Model 488 Switching Concepts 492 Ethernet 492 MAC Addresses 493 Virtual Local-Area Networks (VLANs) 494 Switching 495 Routing Concepts 496 IPv4 Addresses 496 IPv6 Addresses 501 Routing 504 Exam Preparation Tasks 507 Review All Key Topics 507 Define Key Terms 508 Chapter 17 Networking Components 510 Do I Know This Already? Quiz 510 Foundation Topics 512 What Are Networks? 512 Elements of Networks 516 Hubs 517 Bridges 517 Switches 518 Virtual Local Area Networks (VLANs) 520 Routers 521 Routing in Software 522 Functions of a Router 524 Network Diagrams: Bringing It All Together 526 Software-Defined Networking 526 SDN Controllers 529 Cisco Software-Defined Networking (SDN)
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