Cisco Certified DevNet Associate DEVASC 200-901 Official Cert Guide, 1st edition

Published by Cisco Press (October 1, 2020) © 2021

  • Chris Jackson
  • Jason Gooley
  • Adrian Iliesiu
  • Ashutosh Malegaonkar

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Cisco Certified DevNet Associate DEVASC 200-901 Official Cert Guide presents you with an organised 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 Certified DevNet Associate DEVASC 200-901 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
Cisco Certified DevNet Associate DEVASC 200-901 Official Cert Guide enables you to succeed on the exam the first time and is the only self-study resource approved by Cisco. 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.
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
  • The powerful Pearson Test Prep Practice Test software, with two full exams comprised of well-reviewed, exam-realistic questions, customisation options, and detailed performance reports
  • More than two hours of video training from the author
  • 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 template to help you organise and optimise your study time
  • Authoritative coverage of every DEVASC 200-901 exam topic, with all the context and practical examples you need
  • Logical, well-organized, and practical coverage of software development/design, APIs, platforms, application deployment, security, infrastructure, automation, and network fundamentals
  • Includes realistic practice tests, plus extensive proven features to help you review more efficiently
  • By Cisco technical leaders who are responsible for all Cisco DevNet training and enablement
  • For all candidates pursuing Cisco DevNet Associate certification
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)     530

Exam Preparation Tasks     531

Review All Key Topics     531

Define Key Terms     531

Chapter 18  IP Services     532

“Do I Know This Already?” Quiz     532

Foundation Topics     534

Common Networking Protocols     534

    Dynamic Host Configuration Protocol (DHCP)     534

        Server Discovery     536

        Lease Offer     537

        Lease Request     537

        Lease Acknowledgment     537

        Releasing     537

    Domain Name System (DNS)     538

Network Address Translation (NAT)     540

    Simple Network Management Protocol (SNMP)     543

    Network Time Protocol (NTP)     545

Layer     2 Versus Layer     3 Network Diagrams     547

Troubleshooting Application Connectivity Issues     548

Exam Preparation Tasks     550

Review All Key Topics     550

Define Key Terms     551

Chapter 19  Final Preparation     552

Getting Ready     552

Tools for Final Preparation     553

    Pearson Cert Practice Test Engine and Questions on the Website     553

        Accessing the Pearson Test Prep Software Online     553

        Accessing the Pearson Test Prep Software Offline     554

    Customizing Your Exams     554

    Updating Your Exams     555

        Premium Edition     555

    Chapter-Ending Review Tools     556

Suggested Plan for Final Review/Study     556

Summary     556

Appendix A  Answers to the “Do I Know This Already?” Quiz Questions     558

Appendix B  DevNet Associate DEVASC 200-901 Official Cert Guide Exam     570

Glossary     573

Index     582



Online Elements

Appendix C  Study Planner

Glossary

Chris Jackson, CCIE No. 6256 (R&S and SEC), is a Distinguished Architect and CTO for Global Sales Training at Cisco. Chris is focused on digital transformation and showing customers how to leverage the tremendous business value Cisco technologies can provide. He is the author of Network Security Auditing (Cisco Press, 2010), CCNA Cloud CLDADM 210-455 Official Cert Guide (Cisco Press, 2016), and various online video courses for Cisco Press. He holds dual CCIEs in security and routing and switching, CISA, CISSP, ITIL v3, seven SANS certifications, and a bachelor's degree in business administration. Residing in Franklin, Tennessee, Chris enjoys tinkering with electronics, robotics, and anything else that can be programmed to do his bidding. In addition, he is a 3rd Degree Black Belt in Taekwondo, rabid Star Wars fan, and has a ridiculous collection of Lego. His wife Piper and three children Caleb, Sydney, and Savannah are the true joy of his life and proof that not everything has to plug into a wall outlet to be fun.

Jason Gooley, CCIE No. 38759 (R&S and SP), is a very enthusiastic and spontaneous person who has more than 20 years of experience in the industry. Currently, Jason works as a Technical Evangelist for the Worldwide Enterprise Networking Sales team at Cisco Systems. Jason is very passionate about helping others in the industry succeed. In addition to being a Cisco Press author, Jason is a distinguished speaker at Cisco Live, contributes to the development of the Cisco CCIE and DevNet exams, provides training for Learning@Cisco, is an active CCIE mentor, is a committee member for the Cisco Continuing Education Program (CE), and is a program committee member of the Chicago Network Operators Group (CHI-NOG), www.chinog.org. Jason also hosts a show called “MetalDevOps.” Jason can be found at www.MetalDevOps.com, @MetalDevOps, and @Jason_Gooley on all social media platforms.

Adrian Iliesiu, CCIE No. 43909 (R&S), is a network engineer at heart with more than 15 years of professional IT experience. Currently, Adrian works as a Technical Leader with the Cisco DevNet Co-Creations team. During his career, Adrian has worked in several roles, including team leader and network, systems, and QA engineer across multiple industries and international organizations. When not working on innovative projects with customers and partners, Adrian advocates the advantages of network programmability and automation with a focus on enterprise and data center infrastructure. He is an established blog author, distinguished speaker at Cisco Live, and a recipient of the coveted Cisco Pioneer award. Adrian also appeared on Cisco TechWiseTV, Cisco Champion podcasts, and DevNet webinars. He holds a bachelor's degree in Electronics and Telecommunications from Technical University of Cluj-Napoca and a master's degree in Telecommunication Networks from Politehnica University of Bucharest.

Ashutosh Malegaonkar is a Cisco Distinguished Engineer, a senior technical contributor, and an industry thought leader. His experience spans across different technology domains: ISR Platforms, Voice, Video, Search, Video Analytics, and Cloud. Over two decades at Cisco, he has done two startups and has won several accolades, including the Pioneer awards. He has delivered several keynotes and talks at Cisco Connect and Cisco Live. He has also been a Tech Field Day Speaker. With more than 25 years of professional experience, he currently leads the DevNet Co-Creations team whose mission is to co-create, innovate, and inspire alongside our strategic customers, partners, and developers. Ashutosh inspires those around him to innovate, and he is continually developing creative new ways to use software and Cisco APIs to solve real problems for our customers. He has a deep understanding of the breadth of Cisco products and technologies and where they can best be applied to serve our customers. Ashutosh has 16 approved patents and two publications.

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