From the course: Firewall Administration Essential Training

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Understand protocols

Understand protocols

From the course: Firewall Administration Essential Training

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Understand protocols

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- [Instructor] A network protocol is a set of established rules that dictate how to format, transmit, and receive data. This allows devices on the network to communicate even if they're vastly different. All they have to do is communicate based on mutually agreed upon protocols. A set of cooperating network protocols is called a protocol suite. The TCP protocol functions on top of the Internet Protocol or IP. This is where the IP and IP address come from. Because of the protocol suite also defines addressing. There are two very important protocols we need to understand in order to write firewall rules. One is TCP and the other is UDP. TCP stands for Transmission Control Protocol. UDP stand for User Datagram Protocol. While the standards are tightly defined and complicated, we can simplify them down to one really important distinction. Data transmitted over TCP is very careful about whether all of the data arrives at its destination and UDP as a protocol isn't so concerned with that…

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