2.13. Identifying the Purpose of Network Services and Protocols

As mentioned earlier, protocols are rules of behavior that network services and applications follow. Each service or application is designed for a specific purpose. As important as it is that you know the port number of the most common network services, it's equally important that you understand the purpose of each of the services and what they bring to the network. In this section we identify the most common network services and protocols and describe their purpose.

2.13.1. Critical Information

You should be glad that you don't have to know every one of the services in an average network, because there are hundreds of them. You should, however, be able to list the most common ...

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