From the course: Learning the Packet Delivery Process

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Learn the purpose of the network access layer

Learn the purpose of the network access layer

From the course: Learning the Packet Delivery Process

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Learn the purpose of the network access layer

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- [Instructor] The network access layer is the bottom layer of the TCP IP model. This layer is mainly responsible for delivering data between two devices on the same network and is sometimes called the data link layer for this reason. It defines how the data moves over the network. To ready the data it's turned into frames. The frames are what's actually transmitted. Frames must be packaged with a header that include the IP and Mac addresses, routing information, error control information and so on. A frame could look like this, for instance. With the data being only part of what's transferred. Once the frames are ready, the data is sent to the physical media that's used in the transmission. To give you an example of what actually happens when data is pushed out on the wire, let's look at ethernet. A very common network type. Ethernet uses CSMA/CD to get data onto the wire. This stands for Carrier Since Multiple Access…

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