What you’ll learn in this course
The Developing Applications using Cisco Core Platforms and APIs (DEVCOR) v1.0 course helps you prepare for Cisco DevNet Professional certification and for professional-level network automation engineer roles. You will learn how to implement network applications using Cisco® platforms as a base, from initial software design to diverse system integration, as well as testing and deployment automation. The course gives you hands-on experience solving real world problems using Cisco Application Programming Interfaces (APIs) and modern development tools.

This course helps you prepare to take the 350-901 Developing Applications using Cisco Core Platforms and APIs (DEVCOR) exam. By passing this exam, you satisfy the core exam requirement toward Cisco Certified DevNet Professional, and you earn the Cisco Certified DevNet Specialist – Core certification. This course also earns you 64 Continuing Education (CE) credits towards recertification.

Course duration
Instructor-led training: 5 days in the classroom and 3 days of self-study
Virtual instructor-led training: Equivalent of 5 days of classroom instruction and 3 days of self-study
E-learning: Equivalent of 8 days of classroom instruction
How you’ll benefit

This course will help you:
Take full advantage of the network and software development practices when you implement applications to fulfill business needs
Gain proficiency with applications, automation, and Cisco platforms
Earn 64 CE credits toward recertification
Prepare for the 350-901 DEVCOR exam and join the DevNet class of 2020

What to expect in the exam
The 350-901 DEVCOR exam certifies your knowledge of software development and design including using APIs, Cisco platforms, application deployment and security, and infrastructure and automation.

After you pass 350-901 DEVCOR, you satisfy the core exam requirement toward Cisco Certified DevNet Professional, and you earn Cisco Certified DevNet Specialist – Core certification.

Who should enroll
This course is designed for anyone who performs or seeks to perform a developer role and has one or more years of hands-on experience developing and maintaining applications that are built on top of Cisco platforms.

This course covers specialized material about designing, developing, and debugging applications using Cisco APIs and platforms, and managing and deploying applications on Cisco infrastructure. To fully benefit from this course, you should have three to five years of experience designing and implementing applications that are built on top of Cisco platforms.

The course is appropriate for:
Network engineers expanding their skill-base to include software and automation
Developers expanding expertise in automation and DevOps
Solution architects moving to the Cisco ecosystem
Infrastructure developers designing hardened production environments

The job roles best suited to the material in this course are:
Senior network automation engineer
Senior software developer
Senior system integration programmer

Additional job roles that could find this course useful are:
Senior infrastructure architect
Senior network designer
Senior test development engineer

Technology areas
Automation
Network programmability
Course details
Objectives

After taking this course, you should be able to:
Describe the architectural traits and patterns that improve application maintainability
Describe the architectural traits and patterns that improve application serviceability
Identify steps to design and build a ChatOps application
Implement robust Representational State Transfer (REST) API integrations with network error handling, pagination, and error flow control
Describe the necessary steps for securing user and system data in applications
Describe the necessary steps for securing applications
Identify common tasks in automated application release process
Describe best practices for application deployment
Describe methodologies for designing distributed systems
Describe the concepts of infrastructure configuration management and device automation
Utilize Yet Another Next Generation (YANG) data models to describe network configurations and telemetry
Compare various relational and nonrelational database types and how to select the appropriate type based on requirements

Prerequisites
There are no formal prerequisites for Cisco Certified DevNet Associate certification, but you should make sure to have a good understanding of the exam topics before taking the exam as well as knowledge in the following areas:

Knowledge of program design and coding with focus on Python
Familiarity with Ethernet, TCP/IP, and Internet-related networking
Understand the utilization of APIs
Understanding of software development and design methodologies
Hands-on experience with a programming language (specifically Python)

Here are Cisco learning resources that can help you prepare:
Developing Applications and Automating Workflows Using Cisco Core Platforms (DEVASC)
Explore the DevNet Certification area for specific topics and labs related to this course and certification: https://developer.cisco.com/certification/

Outline
This class includes lecture sections and self-study sections. In instructor-led classes, lectures are delivered in real-time, either in person or via video conferencing. In e-learning courses, the lectures are on recorded videos. In both versions, you will need to review self-study sections on your own before taking the certification exam.

Section title
Learning mode
Designing for Maintainability Self-study
Designing for Serviceability Self-study
Implementing ChatOps Application Lecture
Describing Advanced REST API Integration Lecture
Securing Application Data Self-study
Securing Web and Mobile Applications Self-study
Automating Application-Release Lecture
Deploying Applications Lecture
Understanding Distributed Systems Lecture
Orchestrating Network and Infrastructure Lecture
Modeling Data with YANG Lecture
Using Relational and Non-Relational Databases Self-study
Lab Code Reference Self-study
Lab outline

Construct Sequence Diagram
Construct Web Sequence Diagram
Use Cisco Webex Teams™ API to Enable ChatOps
Integrate Cisco Meraki™ API to List Service Set Identifiers (SSIDs) and Retrieve Location Data
Use Paginated REST API Endpoint
Utilize REST API Error Control Flow Techniques
Evaluate Application for Common Open Web Application Security Project (OWASP) Vulnerabilities
Resolve Merge Conflicts with Git
Diagnose Continuous Integration and Continuous Delivery (CI/CD) Pipeline Failures
Containerize Application Using Docker
Integrate Application into Existing CI/CD Environment
Diagnose Problems Using Application Logs
Configure Network Parameters Using Puppet
Configure Network Parameters Using Ansible
Synchronize Firepower Device Configuration
Utilize RESTCONF for Network Configuration
Query Relational Database
Query Document Store
Query Time Series Database
Query Graph Database

QUESTION 1
A developer has created an application based on customer requirements. The customer needs to run the
application with the minimum downtime. Which design approach regarding high-availability applications,
Recovery Time Objective, and Recovery Point Objective must be taken?

A. Active/passive results in lower RTO and RPO. For RPO, data synchronization between the two data centers must be timely to allow seamless request flow.
B. Active/passive results in lower RTO and RPO. For RPO, data synchronization between the two data centers does not need to be timely to allow seamless request flow.
C. Active/active results in lower RTO and RPO. For RPO, data synchronization between the two data centers does not need to be timely to allow seamless request flow.
D. Active/active results in lower RTO and RPO. For RPO, data synchronization between the two data centers must be timely to allow seamless request flow.

Correct Answer: A

QUESTION 2
A cloud native project is being worked on in which all source code and dependencies are written in Python,
Ruby, and/or JavaScnpt. A change in code triggers a notification to the CI/CD tool to run the CI/CD pipeline.
Which step should be omitted from the pipeline?

A. Deploy the code to one or more environments, such as staging and/or production.
B. Build one of more containers that package up code and all its dependencies.
C. Compile code.
D. Run automated tests to validate the code.

Correct Answer: A
 

QUESTION 3
Which two statements are considered best practices according to the 12-factor app methodology for application design? (Choose two.)

A. Application code writes its event stream to stdout.
B. Application log streams are archived in multiple replicated databases.
C. Application log streams are sent to log indexing and analysis systems.
D. Application code writes its event stream to specific log files.
E. Log files are aggregated into a single file on individual nodes.

Correct Answer: AD

QUESTION 4
An organization manages a large cloud-deployed application that employs a microservices architecture. No
notable issues occur with downtime because the services of this application are redundantly deployed over
three or more data center regions. However, several times a week reports are received about application
slowness. The container orchestration logs show faults in a variety of containers that cause them to fail and
then spin up brand new.
Which action must be taken to improve the resiliency design of the application while maintaining current scale?

A. Update the base image of the containers.
B. Test the execution of the application with another cloud services platform.
C. Increase the number of containers running per service.
D. Add consistent “try/catch(exception)” clauses to the code.

Correct Answer: D

QUESTION 5
How should a web application be designed to work on a platform where up to 1000 requests per second can be served?

A. Use algorithms like random early detection to deny excessive requests.
B. Set a per-user limit (for example, 5 requests/minute/user) and deny the requests from the users who have reached the limit.
C. Only 1000 user connections are allowed; further connections are denied so that all connected users can be served.
D. All requests are saved and processed one by one so that all users can be served eventually.

Correct Answer: D

QUESTION 6
An organization manages a large cloud-deployed application that employs a microservices architecture across
multiple data centers. Reports have been received about application slowness. The container orchestration
logs show that faults have been raised in a variety of containers that caused them to fail and then spin up
brand new instances.
Which two actions can improve the design of the application to identify the faults? (Choose two.)

A. Automatically pull out the container that fails the most over a time period.
B. Implement a tagging methodology that follows the application execution from service to service.
C. Add logging on exception and provide immediate notification.
D. Do a write to the datastore every time there is an application failure.
E. Implement an SNMP logging system with alerts in case a network link is slow.

Correct Answer: BC

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