Summary
We saw in this chapter some pretty complicated networks. We also saw that building firewalls and QoS for such networks is not so complicated. However, it is very important to draw the network and identify security breakpoints to be able to create a firewall that will protect your network.
In my opinion, the most important things about security are knowing your network, building it in an intelligent manner and with security in mind, and most of all, understanding how packets flow in your network.
Understanding the flow of the packets in the network is essential for people who want to build good firewalls and intelligent QoS. I've seen simpler networks than the ones presented here with very complicated firewalls, which had rules that didn't ...
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