Chapter 4 of 6 · Cisco CCNA 200-901 DEVASC
Application Deployment and Security
Cloud models, containers, CI/CD, unit tests, Docker, OWASP threats, network services and Bash.
- 8topics
- 35 minfast track
- 4diagrams and exhibits
- 15%of the exam
Topics in this chapter
Take them in order, or jump to the one you need.
- 1Edge Computing and Cloud Deployment ModelsLearn the benefits of edge computing and compare private cloud, public cloud, hybrid cloud and edge deployment models by control…4 min
- 2Virtual Machines, Bare Metal and ContainersCompare bare metal servers, virtual machines and containers by isolation, speed, size and portability, and learn when each…Diagram4 min
- 3CI/CD Pipelines and DevOps PrinciplesLearn the stages of a CI/CD pipeline for applications, the difference between delivery and deployment, a sample pipeline file and…Diagram4 min
- 4Writing a Python Unit TestWrite a Python unit test with the unittest module, using TestCase, assert methods, setUp and mock to fake API calls, and run it…4 min
- 5Reading a Dockerfile and Using Docker ImagesRead a Dockerfile line by line and use Docker commands to build, run, list, stop and remove images and containers in a local…Diagram5 min
- 6Application Security and OWASP ThreatsLearn how to protect secrets, encrypt data at rest and in transit, handle data safely and spot the top OWASP threats: XSS, SQL…5 min
- 7Firewalls, DNS, Load Balancers and Reverse ProxiesLearn how firewalls, DNS, load balancers and reverse proxies work together to expose, scale and protect an application deployed…Diagram5 min
- 8Bash Commands for Files, Directories and VariablesUse common Bash commands to navigate directories, manage files, view text and set environment variables, with permissions, pipes…4 min
About this chapter
What this chapter covers
This chapter is about taking an application from your laptop to a running, protected service.
It covers where applications run, how they are packaged, how they are tested and released, and how they are kept safe. It also introduces Bash, the shell that ties many of these tasks together.
The topics are the everyday skills of a developer who works close to the network.
How the topics fit together
A change travels from code, through tests and a build, into a package, and out to an environment that is protected by network services.
The first two pages describe the places and forms of deployment: private, public, hybrid and edge, and then bare metal, virtual machines and containers. The pipeline page shows how a commit is built, tested and released, and how DevOps ties the people and the tools together.
The unit test page shows the checks that the pipeline runs. The Docker page shows how an application is packaged into an image and run on your own machine.
Security and network services cover the protection around that application. The security page deals with secrets, encryption and the OWASP threats.
The network services page explains how DNS, firewalls, load balancers and reverse proxies shape the path of a request. The Bash page covers the commands that you use throughout.
Containers appear in several pages. Learn them once, and the Docker, CI/CD and deployment topics will all connect.
How to use these pages
Each topic page has the same shape, so you can skim for what you need.
- What it is: the idea in plain words.
- How it works: the mechanism, with diagrams and short examples.
- What to remember for the exam: the facts to memorise.
- Common mistakes: the classic traps.
- Check yourself: three questions to test your understanding.
Install Docker and Python on your own machine, and run every example. Building an image and breaking a unit test on purpose will teach you more than reading about them. For the security page, learn each attack together with its defence.
Ready for more practice?
The full Cisco CCNA 200-901 DEVASC question bank has 808 questions, with timed practice exams and an explanation for every answer.
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