Small business working out of the home or small office, typically with 10 or fewer computers, most of the more advanced technologies are not cost-effective. Anti-Virus software packages are very important to keep installed and up-to-date on individual computers. Domain authentication allows network users to share resources on the network, while blocking out users who do not have domain access. Large corporate networks have a higher need for network-based security measures to protect their increased number of users. Large networks have advanced firewalls running on dedicated machines just for this purpose.”]
Source: https://www.govinfosecurity.com/network-perimeter-safety-a-781