Network security
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Give some reasons as to why network security is necessary.
• Ensures only authorised users can access the network and its resources • Ensures users can only access data relevant to them • Prevents misuse, such as deleting information, installing software, copying and removing data • Prevents damage to hardware
Describe some factors that warrant the importance of network security.
• Business success - data on the network is vital for running an organisation, the business may fail if data is compromised • Privacy - data stored on the network may be sensitive (e.g. medical records, must be stored securely to comply with the law) • Financial - the data may be financially valuable (e.g. details of new products, marketing campaigns)
Identify three methods of protection in network security.
• Physical security • Access control • Firewalls
Describe some features of using physical security to protect a network.
• Access doors of building where network equipment is located should be kept locked, and should be fitted with security recognition measures (keypads) • Biometric security recognition can be used on mobile devices to authenticate users / swipe cards containing users’ details can be used for entry to building • Closed-circuit television can be used to monitor building’s interior and exterior • RFID chips can be fitted to all equipment so that an alarm will sound if equipment is removed
Describe some features of access control in protecting networks.
• Access control limits who can log into a network and what they are permitted to do • Authentication is the process of determining whether a person attempting to gain access is who they claim to be • Biometric authentication is gaining popularity because of the uniqueness and convenience
Describe some features of the permissions that some people on a network may be given.
• Some users may not be able to view certain folders and files • Users can be given ‘read-only’ access so that they can read files, or ‘read and write’ access so they can also modify them • At a higher level, users can be given the right to delete files and also to set other users’ rights to particular files
Describe some features of using firewalls to protect a network.
• They protect a network connected to a WAN such as the internet • Firewalls can be configured to prevent communications from entering the network, and to prevent programs and users from accessing the internet from within the network