Network security is a broad term that can refer to the security of devices that comprise the network infrastructure, the traffic sent over that infrastructure, the hosts (clients and servers) attached to the infrastructure, the applications that utilize the network, the user community and the policies that govern usage of that network.
In this course, we will use the first four layers of the OSI protocol stack (physical, link, network, and transport) to introduce many aspects of network security. In particular, we will consider how devices at each layer provide 'defense in depth' by securing communications traffic as well as preventing unauthorized access. Our examination will be enhanced by using various security tools to observe network traffic that illustrates how security can be applied throughout today's enterprise.
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