3.0 Infrastructure Security
In this section, well talk about the components of a network, and the security implications of them. Well also discuss security-related processes such as intrusion detection and increasing the security of networks, operating systems and applications, which is known as hardening. This section is a practical look at what you want to consider when securing your network -- everything from the bits and bytes traveling across a network cable to the server applications running on it.
Why cover everything from hardware devices to applications in a single section? you might ask. Well, to partly reinforce the point that a network is only as secure as its least secure component. You can have the most secure Internet gateway whatsoever, but, if one random user has installed a modem on her PC and uses that modem to connect to her personal Internet account, your internal network is exposed.
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