Network security is a field of computer science concerned with the control of risks related to network utilization.
The means traditionally taken to realize this objective is to attempt to create a secure network and server platform, designed so that agents (users or programs) can only perform actions that have been allowed. This involves specifying and implementing a security policy. The actions in question can be reduced to operations of access, modification and deletion. Network security can be seen as a subfield of security engineering, which looks at broader security issues in addition to computer security.
In a secure system the legitimate users of that system are still able to do what they should be able to do.
network security solutions will secure your network and servers with constant security measures like installing latest software released from vendor, maintaining firewalls, installing intrusion detection systems.