CND – Network Security Controls
The list of security attacks is very long, and the news media carry frequent accounts of serious security incidents. From these, you may be ready to conclude that network security is hopeless. Fortunately, that is not the case. Previous chapters have presented several strategies for addressing security concerns, such as encryption for confidentiality and integrity, reference monitors for access control, and overlapping controls for defense in depth. These strategies are also useful in protecting networks. This section presents many excellent defenses available to the network security engineer. Subsequent sections provide detailed explanations for three particularly important controls—firewalls, intrusion detection systems, and encrypted e-mail.
Security Threat Analysis
Recall the three steps of a security threat analysis in other situations. First, we scrutinize all the parts of a system so that we know what each part does and how it interacts with other parts. Next, we consider possible damage to confidentiality, integrity, and availability. Finally, we hypothesize the kinds of attacks that could cause this damage. We can take the same steps with a network. We begin by looking at the individual parts of a network:
- local nodes connected via
- local communications links to a
- local area network, which also has
- local data storage,
- local processes, and
- local devices.
The local network is also connected to a
- network gateway which gives access via
- network communications links to
- network control resources,
- network routers, and
- network resources, such as databases.
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