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
18 Troubleshooting Automation Issues Explained

18 Troubleshooting Automation Issues Explained

1. Configuration Drift

Configuration drift occurs when the actual configuration of a network device deviates from the intended configuration. This can happen due to manual changes or automated scripts that overwrite each other.

Example: A network administrator manually changes the VLAN settings on a switch, which conflicts with an automated script that was supposed to apply a different VLAN configuration. This results in configuration drift.

2. API Rate Limiting

API rate limiting refers to the restriction on the number of requests a client can make to an API within a specific time period. Exceeding this limit can result in errors or temporary bans.

Example: A Python script that polls a network device's API every second hits the rate limit, causing subsequent requests to be rejected. The script needs to be adjusted to poll at a lower frequency.

3. Authentication Failures

Authentication failures occur when a client is unable to authenticate with a server due to incorrect credentials, expired tokens, or other authentication issues.

Example: A network automation script fails to authenticate with a Cisco DNA Center instance because the API token has expired. The script needs to request a new token before proceeding.

4. Network Latency

Network latency is the delay between sending a request and receiving a response. High latency can cause timeouts and slow down automation processes.

Example: A network automation script that configures devices over a WAN connection experiences high latency, causing timeouts. The script needs to be optimized to handle longer response times.

5. Script Execution Errors

Script execution errors occur when a script encounters an unexpected condition, such as a syntax error, runtime error, or logical error.

Example: A Python script that configures VLANs on a switch encounters a syntax error due to a missing colon in an if statement. The script needs to be corrected to run successfully.

6. Data Parsing Errors

Data parsing errors happen when a script is unable to correctly interpret the data it receives, often due to mismatched data formats or unexpected data structures.

Example: A script that parses JSON data from a network device receives data in XML format, causing a parsing error. The script needs to be updated to handle both JSON and XML formats.

7. Dependency Issues

Dependency issues occur when a script or application relies on external libraries or services that are not available, outdated, or incompatible.

Example: A network automation script relies on an outdated version of the Netmiko library, which is incompatible with the latest network devices. The script needs to be updated to use the latest version of the library.

8. Configuration Locking

Configuration locking issues arise when multiple scripts or users attempt to modify the same configuration simultaneously, leading to conflicts and errors.

Example: Two network automation scripts attempt to modify the routing configuration on a router at the same time, causing a configuration lock. The scripts need to implement a locking mechanism to prevent conflicts.

9. API Version Mismatch

API version mismatch occurs when a client application uses an outdated or incompatible version of an API, leading to errors or unexpected behavior.

Example: A network automation script uses an outdated version of the Cisco NX-API, which is no longer supported by the latest network devices. The script needs to be updated to use the latest API version.

10. Incomplete Data Collection

Incomplete data collection happens when a script fails to collect all necessary data from a network device, leading to incomplete or inaccurate automation processes.

Example: A script that collects interface statistics from a switch misses some interfaces due to a filtering error. The script needs to be corrected to collect data from all interfaces.

11. Timeout Errors

Timeout errors occur when a script or application waits too long for a response from a network device or service, leading to a timeout and failure of the automation process.

Example: A network automation script that configures a large number of devices experiences timeout errors due to long response times. The script needs to be optimized to handle longer response times or split into smaller batches.

12. Resource Constraints

Resource constraints occur when a script or application consumes too many system resources, such as CPU, memory, or disk space, leading to performance issues or failures.

Example: A network automation script that processes large amounts of data consumes too much memory, causing the system to slow down or crash. The script needs to be optimized to use fewer resources.

13. Log Parsing Errors

Log parsing errors happen when a script is unable to correctly interpret log files from network devices, often due to unexpected log formats or incomplete logs.

Example: A script that parses log files from a network device encounters errors due to a change in the log format. The script needs to be updated to handle the new log format.

14. Configuration Rollback Failures

Configuration rollback failures occur when a script or application is unable to revert to a previous configuration after a failed automation process, leading to inconsistent or incorrect configurations.

Example: A network automation script that configures a new routing protocol fails halfway through, but the rollback process also fails, leaving the network in an inconsistent state. The script needs to be improved to ensure successful rollbacks.

15. API Endpoint Changes

API endpoint changes occur when a network device or service changes its API endpoints, causing scripts or applications to fail due to incorrect or outdated endpoint URLs.

Example: A network automation script that uses a deprecated API endpoint to configure VLANs on a switch fails after the switch firmware is updated. The script needs to be updated to use the new API endpoint.

16. Data Validation Errors

Data validation errors occur when a script or application fails to validate the data it receives, leading to incorrect or inconsistent automation processes.

Example: A script that configures VLANs on a switch fails to validate the VLAN IDs, causing invalid VLANs to be configured. The script needs to include data validation checks to prevent such errors.

17. Script Execution Order

Script execution order issues occur when multiple scripts or tasks are executed in the wrong order, leading to incorrect or inconsistent configurations.

Example: A network automation process that includes multiple scripts for configuring VLANs, routing, and security policies is executed in the wrong order, causing configuration conflicts. The scripts need to be executed in the correct order to ensure consistent configurations.

18. Environment Mismatch

Environment mismatch issues occur when a script or application is executed in an environment that is different from the one it was designed for, leading to errors or unexpected behavior.

Example: A network automation script that was designed to run in a test environment is executed in a production environment, causing unexpected errors due to differences in network configurations. The script needs to be tested and adapted for the production environment.