Most network security is now managed by means of a technology solution such as a firewall. Network security is a specialised area often considered beyond the capability of small business owners and even regular IT support vendors, but instead requiring the services of a network security specialist.
There is a wide choice of intrusion prevention devices (IPDs) and intrusion prevention systems (IPSs) available which, again, generally require a degree of specialisation to deploy. You can also engage specialist organisations to test the integrity of your security.
Here are some commonly-visited subjects covered on this website to give you more information and advice about keeping your computers secure: