Cisco DevNet Certifications - DevNet Specialist
1 Introduction to Cisco DevNet
2 Cisco DevNet Certifications Overview
1 DevNet Associate
2 DevNet Professional
3 DevNet Specialist
3 DevNet Specialist Certification Path
1 Core Competencies
2 Specialization Tracks
4 DevNet Specialist - Enterprise Automation and Programmability
1 Introduction to Enterprise Automation
2 Network Programmability Concepts
3 Cisco DNA Center APIs
4 Cisco IOS XE Programmability
5 Cisco ACI Programmability
6 Cisco SD-WAN Programmability
7 Cisco UCS Programmability
8 Automation Tools and Frameworks
9 Python for Network Engineers
10 RESTful APIs and HTTP Methods
11 JSON and XML Data Formats
12 YANG Data Modeling
13 NETCONF and RESTCONF
14 Ansible for Network Automation
15 Puppet for Network Automation
16 Git and Version Control
17 CICD Pipelines for Network Automation
18 Troubleshooting Automation Issues
5 DevNet Specialist - Network Programmability and Automation
1 Introduction to Network Programmability
2 Network Automation Concepts
3 Cisco NX-API and NX-OS Programmability
4 Cisco IOS XR Programmability
5 Cisco Meraki Programmability
6 Cisco Catalyst 9000 Series Programmability
7 Cisco SD-Access Programmability
8 Network Automation Tools and Frameworks
9 Python for Network Engineers
10 RESTful APIs and HTTP Methods
11 JSON and XML Data Formats
12 YANG Data Modeling
13 NETCONF and RESTCONF
14 Ansible for Network Automation
15 Puppet for Network Automation
16 Git and Version Control
17 CICD Pipelines for Network Automation
18 Troubleshooting Automation Issues
6 DevNet Specialist - Software Development and Design
1 Introduction to Software Development
2 Software Design Principles
3 Object-Oriented Programming (OOP)
4 Python Programming Language
5 RESTful API Design
6 Microservices Architecture
7 Containerization with Docker
8 Orchestration with Kubernetes
9 CICD Pipelines for Software Development
10 Test-Driven Development (TDD)
11 Version Control with Git
12 Agile Development Methodologies
13 DevOps Practices
14 Troubleshooting Software Development Issues
7 DevNet Specialist - Cloud Automation and Programmability
1 Introduction to Cloud Automation
2 Cloud Programmability Concepts
3 Cisco CloudCenter Suite
4 Cisco Intersight Programmability
5 Cisco Hybrid Cloud Manager
6 Cisco Application Policy Infrastructure Controller (APIC)
7 Cisco Container Platform
8 Cloud Automation Tools and Frameworks
9 Python for Cloud Engineers
10 RESTful APIs and HTTP Methods
11 JSON and XML Data Formats
12 YANG Data Modeling
13 NETCONF and RESTCONF
14 Ansible for Cloud Automation
15 Puppet for Cloud Automation
16 Git and Version Control
17 CICD Pipelines for Cloud Automation
18 Troubleshooting Cloud Automation Issues
8 DevNet Specialist - Collaboration Programmability
1 Introduction to Collaboration Programmability
2 Cisco Webex Programmability
3 Cisco Unified Communications Manager (CUCM) Programmability
4 Cisco Contact Center Enterprise (CCE) Programmability
5 Collaboration Programmability Tools and Frameworks
6 Python for Collaboration Engineers
7 RESTful APIs and HTTP Methods
8 JSON and XML Data Formats
9 YANG Data Modeling
10 NETCONF and RESTCONF
11 Ansible for Collaboration Automation
12 Puppet for Collaboration Automation
13 Git and Version Control
14 CICD Pipelines for Collaboration Automation
15 Troubleshooting Collaboration Programmability Issues
9 DevNet Specialist - Security Programmability
1 Introduction to Security Programmability
2 Cisco Firepower Management Center (FMC) Programmability
3 Cisco Identity Services Engine (ISE) Programmability
4 Cisco Stealthwatch Programmability
5 Cisco Secure Network Analytics (SNA) Programmability
6 Security Programmability Tools and Frameworks
7 Python for Security Engineers
8 RESTful APIs and HTTP Methods
9 JSON and XML Data Formats
10 YANG Data Modeling
11 NETCONF and RESTCONF
12 Ansible for Security Automation
13 Puppet for Security Automation
14 Git and Version Control
15 CICD Pipelines for Security Automation
16 Troubleshooting Security Programmability Issues
10 DevNet Specialist - Data Center Programmability
1 Introduction to Data Center Programmability
2 Cisco Application Centric Infrastructure (ACI) Programmability
3 Cisco Nexus Programmability
4 Cisco UCS Programmability
5 Data Center Programmability Tools and Frameworks
6 Python for Data Center Engineers
7 RESTful APIs and HTTP Methods
8 JSON and XML Data Formats
9 YANG Data Modeling
10 NETCONF and RESTCONF
11 Ansible for Data Center Automation
12 Puppet for Data Center Automation
13 Git and Version Control
14 CICD Pipelines for Data Center Automation
15 Troubleshooting Data Center Programmability Issues
11 DevNet Specialist - IoT Programmability
1 Introduction to IoT Programmability
2 Cisco IoT Field Network Director (FND) Programmability
3 Cisco Kinetic for Cities Programmability
4 Cisco IoT Operations Dashboard Programmability
5 IoT Programmability Tools and Frameworks
6 Python for IoT Engineers
7 RESTful APIs and HTTP Methods
8 JSON and XML Data Formats
9 YANG Data Modeling
10 NETCONF and RESTCONF
11 Ansible for IoT Automation
12 Puppet for IoT Automation
13 Git and Version Control
14 CICD Pipelines for IoT Automation
15 Troubleshooting IoT Programmability Issues
12 DevNet Specialist - Service Provider Programmability
1 Introduction to Service Provider Programmability
2 Cisco Network Services Orchestrator (NSO) Programmability
3 Cisco IOS XR Programmability
4 Cisco ASR 9000 Series Programmability
5 Service Provider Programmability Tools and Frameworks
6 Python for Service Provider Engineers
7 RESTful APIs and HTTP Methods
8 JSON and XML Data Formats
9 YANG Data Modeling
10 NETCONF and RESTCONF
11 Ansible for Service Provider Automation
12 Puppet for Service Provider Automation
13 Git and Version Control
14 CICD Pipelines for Service Provider Automation
15 Troubleshooting Service Provider Programmability Issues
13 DevNet Specialist - Wireless Programmability
1 Introduction to Wireless Programmability
2 Cisco Wireless LAN Controller (WLC) Programmability
3 Cisco DNA Center Wireless Programmability
4 Cisco Mobility Services Engine (MSE) Programmability
5 Wireless Programmability Tools and Frameworks
6 Python for Wireless Engineers
7 RESTful APIs and HTTP Methods
8 JSON and XML Data Formats
9 YANG Data Modeling
10 NETCONF and RESTCONF
11 Ansible for Wireless Automation
12 Puppet for Wireless Automation
13 Git and Version Control
14 CICD Pipelines for Wireless Automation
15 Troubleshooting Wireless Programmability Issues
14 DevNet Specialist - DevOps and Automation
1 Introduction to DevOps and Automation
2 Continuous Integration (CI)
3 Continuous Deployment (CD)
4 Infrastructure as Code (IaC)
5 Configuration Management Tools
6 Monitoring and Logging
7 Containerization and Orchestration
8 CICD Pipelines
9 Version Control with Git
10 Agile Development Methodologies
11 DevOps Practices
12 Troubleshooting DevOps Issues
15 DevNet Specialist - Automation and Programmability Best Practices
1 Best Practices for Network Automation
2 Best Practices for Software Development
3 Best Practices for Cloud Automation
4 Best Practices for Security Programmability
5 Best Practices for Data Center Programmability
6 Best Practices for IoT Programmability
7 Best Practices for Service Provider Programmability
8 Best Practices for Wireless Programmability
9 Best Practices for Collaboration Programmability
10 Best Practices for DevOps and Automation
16 DevNet Specialist - Certification Exam Preparation
1 Exam Objectives and Domains
2 Study Resources and Materials
3 Practice Exams and Simulations
4 Exam Registration and Scheduling
5 Test-Taking Strategies
6 Post-Exam Actions and Certification Maintenance
16 Troubleshooting Security Programmability Issues Explained

16 Troubleshooting Security Programmability Issues Explained

1. API Authentication Failures

API authentication failures occur when a client application fails to authenticate with the API server. This can be due to incorrect credentials, expired tokens, or misconfigured authentication mechanisms.

Example: Think of API authentication as a door lock. If you use the wrong key (incorrect credentials) or the key has expired (expired token), you won't be able to open the door (access the API).

2. SSL/TLS Certificate Errors

SSL/TLS certificate errors happen when there is a problem with the SSL/TLS certificate used for secure communication. This can include issues like expired certificates, self-signed certificates, or certificate chain issues.

Example: Consider SSL/TLS certificates as a passport. If your passport is expired (expired certificate) or not recognized by authorities (self-signed certificate), you won't be allowed to travel (secure communication).

3. Firewall Blocking API Requests

Firewall blocking API requests occurs when network firewalls block incoming or outgoing API requests due to misconfigured rules or policies. This can prevent communication between client applications and API servers.

Example: Think of a firewall as a bouncer at a club. If the bouncer doesn't recognize you (misconfigured rules), you won't be allowed in (API requests are blocked).

4. Rate Limiting Issues

Rate limiting issues happen when an API server restricts the number of requests a client can make within a certain time period. This can lead to errors if the client exceeds the allowed rate.

Example: Consider rate limiting as a traffic light. If you go through too many green lights too quickly (exceed the rate limit), you'll hit a red light (API error).

5. Data Encoding Errors

Data encoding errors occur when data is not encoded or decoded correctly, leading to malformed requests or responses. This can happen with formats like JSON, XML, or YAML.

Example: Think of data encoding as translating a message. If the translation is incorrect (malformed data), the message won't make sense (API error).

6. API Versioning Conflicts

API versioning conflicts happen when a client application uses an outdated or incorrect version of the API, leading to compatibility issues. This can result in errors or unexpected behavior.

Example: Consider API versioning as a software update. If you use an old version (outdated API) with new features, it won't work correctly (compatibility issues).

7. Network Latency and Timeouts

Network latency and timeouts occur when there is a delay in network communication, causing API requests to take too long and eventually time out. This can be due to high network traffic or poor connectivity.

Example: Think of network latency as a slow internet connection. If your connection is too slow (high latency), you'll experience buffering (timeouts).

8. Resource Exhaustion

Resource exhaustion happens when an API server runs out of resources like memory, CPU, or disk space, leading to performance degradation or crashes. This can be caused by high traffic or inefficient code.

Example: Consider resource exhaustion as a crowded room. If there are too many people (high traffic), the room will become overcrowded (resource exhaustion).

9. Misconfigured API Endpoints

Misconfigured API endpoints occur when the URLs or paths for API requests are incorrect or not properly set up. This can lead to 404 errors or other routing issues.

Example: Think of API endpoints as addresses. If you go to the wrong address (misconfigured endpoint), you won't find what you're looking for (404 error).

10. Data Validation Errors

Data validation errors happen when the data sent to an API does not meet the required format or constraints. This can result in validation errors or rejected requests.

Example: Consider data validation as a form. If you fill out the form incorrectly (invalid data), it won't be accepted (validation error).

11. Dependency Issues

Dependency issues occur when an application relies on external libraries or services that are not available or not functioning correctly. This can lead to runtime errors or failures.

Example: Think of dependencies as ingredients for a recipe. If one ingredient is missing (unavailable dependency), the recipe won't work (runtime error).

12. Logging and Monitoring Failures

Logging and monitoring failures happen when there is a problem with capturing or analyzing logs and metrics from API interactions. This can hinder troubleshooting and performance analysis.

Example: Consider logging and monitoring as security cameras. If the cameras are not working (logging failure), you won't be able to see what happened (troubleshooting).

13. Misconfigured Security Policies

Misconfigured security policies occur when security rules or policies are not correctly set up, leading to unauthorized access or security breaches. This can compromise the integrity of the system.

Example: Think of security policies as locks on doors. If the locks are not set up correctly (misconfigured policies), intruders can get in (security breach).

14. API Gateway Issues

API gateway issues happen when there is a problem with the API gateway, which acts as an intermediary between clients and backend services. This can include routing errors, authentication failures, or performance issues.

Example: Consider an API gateway as a receptionist. If the receptionist is not doing their job (gateway issue), clients won't be able to reach the services (routing errors).

15. Data Consistency Problems

Data consistency problems occur when data across different systems or databases is not synchronized, leading to discrepancies or conflicts. This can affect the accuracy and reliability of the data.

Example: Think of data consistency as a shared calendar. If the calendar is not updated across all devices (data inconsistency), there will be conflicts (discrepancies).

16. Misconfigured Load Balancers

Misconfigured load balancers happen when the load balancer is not correctly set up to distribute traffic across multiple servers. This can lead to uneven load distribution, performance issues, or downtime.

Example: Consider a load balancer as a traffic cop. If the traffic cop is not directing traffic correctly (misconfigured load balancer), there will be congestion (performance issues).