Hello! The differences and connections among network engineers, network security engineers and information security engineers are different in the main training objectives and key knowledge, technology, methods and ability requirements. There are various training points all over the country.
Network engineers focus on the knowledge, technology, methods and abilities of network engineering (software and hardware) and management.
Network security engineers mainly study the knowledge, technology, methods and abilities of network security, network security engineering and management. Network security engineers are divided into three categories: assistant (junior), intermediate and senior network information security engineers. See my answer for details:
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Compared with network security engineers, information security engineers mainly focus on information security, including information security and data.
I wish you all the best and all the best!