A network security engineer’s responsibilities are multifaceted as they’ll have to make the system as secure as possible. They are responsible for many different tasks related to the security of the system.

Creating virus and threat detection systems.
Configuring and installing security infrastructure devices.
Investigating intrusion and hacking incidents, collecting incident responses, and carrying out forensic investigations.
Determining latest technologies and processes that improve the overall security of the system.
Using industry-standard analysis criteria to test the security level of the firm.
Developing tracking documents to note system vulnerabilities.
Reporting the security analysis and monitoring findings.
Supervising the configuration and installation of new software and hardware.
Implementing regulatory systems in accordance with IT security.
Informing the company about the security incidents as soon as possible.
Modifying the technical, legal, and regulatory aspects of the system security.
Defining and maintaining security policies.
Occasionally replacing the security system protocol and architecture.
Maintaining switches and servers.