Includes a recipe for calculating a subnet mask, a network address and a broadcast address. A general introduction to the Domain Name System and how it works on the Internet. Firewall security Provides an understanding of the role of firewalls. Describes how firewalls work and why it is important that a company has a carefully planned security policy. You should have a basic understanding of IP addresses beforehand.
Proxy servers Find out how proxy servers can help reduce costs as well as increase control.