The CCDP's challenge can be to consolidate a company's many different security technologies
so that there are just a few. This saves the company personnel training costs by limiting the
devices on which those personnel need to be trained. It also reduces ongoing administrative
costs of needing people to monitor logs and so on. Another advantage is that applications once
considered unsafe can be implemented, enabling extranet-type applications to link the company
more closely with partners and suppliers. The Internet will be a more accessible global
access medium.
required. At least three different types of firewalls are commonly used in today's networks:
discussed.
routers. A perimeter router is the router that interfaces with the Internet, or the exit point from
a customer's network, as shown in Figure 15-5.