Network security consists of the policies adopted to prevent and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources.

Network security is typically handled by a network administrator or system administrator who implements the security policy, network software and hardware needed to protect a network and the resources accessed through the network from unauthorized access and also ensure that employees have adequate access to the network and resources to work.

A network security system typically relies on layers of protection and consists of multiple components including networking monitoring and security software in addition to hardware and appliances. All components work together to increase the overall security of the computer network.

Network Security Service Features:

Confidentiality: information should be not disclosed to unauthorized users, entities or processes, or any feature for their use.

Integrity: data cannot be modified without authorization, in other words, the information cannot be modified, destroyed or lost while being stored or during transmission process.

Availability: information is accessible by authorized entities. The attacks to the availability include a denial of service, destroying networks and relevant systems operation under the network environment.

Controllability: the control over the transmission of information and content.

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