Firewall Installation Services in Coimbatore | Nallu Infotech: One of the many tasks of a system administrator is the installation and setting up of firewalls in an organization. A firewall is a vital component of a firm’s network and it plays an extremely important part in securing and protecting it; network security refers to methods of addressing external and internal threats to a company’s network system. Firewalls can help secure a network from both internal and external dangers.