There are many network components and topologies (layouts) that we need to know about to maintain a secure environment. We are going to look at each of these in turn. We need to know how each device is configured and which device is the most appropriate in different scenarios. We will look at firewalls, the main job of which is to prevent unauthorized access to the network.
Installing and Configuring Network Components
Firewall
A firewall prevents unauthorized access to the corporate network, and in the Security+ exam, we tend to use a back-to-back configuration, as shown here:
Figure 2: Back-to-back firewall configuration
You can see each of these firewalls is not letting traffic pass through them; this is because we need...
