A network tester is a person who tests and evaluates the performance, reliability, and security of a computer network. Network testers may work with a variety of different types of networks, including local area networks (LANs), wide area networks (WANs), and wireless networks.

Network testers use a variety of tools and techniques to test the various components of a network, including routers, switches, firewalls, and other devices. They may use automated testing tools to identify vulnerabilities and weaknesses, or they may manually test the network by simulating different types of traffic and analyzing the results.

Network testers work to identify and fix any problems or issues with the network, and they may also work with network administrators to implement and maintain network security measures. They may also be responsible for documenting their findings and providing recommendations for improving the network’s performance and security.

Network testers typically have a strong background in computer science or a related field, and they may hold relevant certifications such as the Certified Network Professional (CCNP) or the Certified Ethical Hacker (CEH). They may work in a variety of settings, including in-house IT departments, consulting firms, or as freelance contractors.