From the course: Learning the Packet Delivery Process

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Explore ports 20, 21, 22, 23, 25, and 53, 80, 443

Explore ports 20, 21, 22, 23, 25, and 53, 80, 443

From the course: Learning the Packet Delivery Process

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Explore ports 20, 21, 22, 23, 25, and 53, 80, 443

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- [Instructor] A port is where network connections start and end. Ports are numbers associated with data that define what kind of data it is, such as email or web surfing. Before we talk any more about ports though, let's recap what we know so far and find out where ports come into play. Most data delivery processes happen over the internet. The data is prepared and separated into data packets at the source before it's sent. During this process, a header and other information are added to each packet at each layer of the TCP/IP model. Once the data packets are ready, they traverse the internet, and using multiple routes, hop from router to router until they reach their destination. The data is reassembled and delivered to the destination host on the network. At the destination computer or network, data enters through an open port. A port can be compared to a doorway in your home. If the door's unlocked, people can…

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