Network Security

Network Security

    The first level of network security is the use of user accounts to allow only authorized users access the network.Without an account,a computer user cannot log in and cannot use the network environment.User IDs are not usually secret but passwords represent another level of security and are secret.Privileges are the next level of security defense.The specific privileges you can assign to users depend on the network operating system.E.g.:System.Operator etc.Privileges control what a user can do on a network-wide basis.Access rights let you fine-tune your network security by controlling specific file operations for specific users.E.g.:read,write,delete etc.Physical security includes locking the door to the computer room,locking the computer,etc.

Methods employed to protect networks from unauthorized access:

• Encryption 
• Firewalling

Encryption 

 It is important that sensitive and secret information should be encoded to reduce the chances of any damage to the organizational data in case if the system`s security is broken and information is accessed.

If information is encoded,any information stolen is useless without the Knowledge of how to decode that information.
Firewalling

       The basic idea of a firewall is to prevent uses external to the organisation from accessing the internal network.This is achieved using routers and computer to filter access to the network.

                Internal user`s requests to external facilities,such as the World Wide Web(WWW),are allowed to pass through the firewall,but requests origination from users external to the organization are blocked by the firewall.

            Although the Firewalling technique is an excellent menthod of protection from the external threats posed to a network,there are number of problems that must be looked at to ensure that the network is capable of providing enough flexibility to meet modern needs.

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