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In this chapter of [[Security+ Essentials]] the topic of security as it pertains to network topologies will be explored. Topologies are created by dividing networks into ''security zones'' providing both a multi-layered defense strategy and different levels of security commensurate with the purpose of each specific zone (for example less security is necessary for a web server than for an internal server containing sensitive customer information).

Tunneling involves the packaging of data packets so that they can securely traverse a public network. In essence, the packets for one protocal are encapsulated in the packets of another protocol. An example is the Point-to-Point Tunneling Protocol which encapsulates its own packets into the TCP/IP protocol. Encapsulation is often combined with encryption to increase the level of security.

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