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With systems being increasingly open to the world via the internet it is very important that these systems are secure. Anti-virus software is an absolute necessity and current offerings usually have variants that scan email as well as files on disk.
Companies need to prevent unauthorised access to their works whether they are childish Denial of Service (DoS) attacks or something more specific to gain information for business advantage; firewalls and virtual private networks (VPNs) are employed to allow only authorised users access.
Companies can improve their employees' efficiency by providing fast and full-time internet access. This access is open to abuse from employees viewing sites for private ends. Software is now available to monitor usage, deny access to certain sites.