System Administrator

• Configuring and installing Linux servers and workstations.
• Administer user accounts and rights.
• Troubleshooting and monitoring system performance.
• Updates and security measures are being implemented.
• Backup and disaster recovery methods must be managed.
• Keeping track of system documentation.

Network Administrator 

• Network Administrators are in charge of configuring and administering network devices and services.
• Configuring and maintaining network connectivity.
• Putting firewall rules and network security measures in place.
• Keeping track of network performance and addressing network issues.
• Domain name service (DNS) and DHCP (Dynamic Host Configuration Protocol) administration.
• Remote access and virtual private networks (VPNs) configuration.

Security Administrator:

• Identifying and analyzing security flaws.
• Putting security rules and best practices into action.
• System monitoring for security breaches and incidents.
• Security audits and risk assessments are carried out.
• Responding to security events and conducting forensic investigations.
• Controlling access and implementing authentication procedures.

Application Administrator:

• Installation, configuration, and management of applications and services.
• Troubleshooting application-specific problems.
• Increasing application performance and maximizing resource utilization.
• Keeping track of application updates and fixes.
• Creating and managing application databases.
• Monitoring and reporting on application logs.

DevOps Engineer:

• Software deployment and infrastructure provisioning are being automated.
• Managing pipelines for continuous integration and continuous delivery (CI/CD).
• Containerization platform configuration and management (e.g., Docker, Kubernetes).
• Analyzing the system and application performance.
• Working with development teams to improve software development methods.
• Putting infrastructure-as-code (IaC) practices in place.