This work deals with possibilities of securing local area network. It is divided into two parts. In the first part there are generally described basics of firewall and antivirus programs function by use of the available literary resources. In case of antivirus products there were created an overview with use of internet based comparative test, which should help in choosing the right program. Then in the second part the issue is tested in practice. Described possibilities are applied to specific software and evaluated. The purpose of this work is to show the issue of securing smaller or medium-sized local area network in practice, and demonstrate and explain the settings on the product step by step.