December 2019
Beginner
510 pages
12h 7m
English
Content preview from Networking Fundamentals
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Layer 2 – the data-link layer
It could be argued that the data-link layer is only relevant within your own subnet, and, while this is true to an extent, we still require it for transmission of data outside of our subnet. The data-link layer creates a logical connection between nodes on the subnet. If the data is destined for a device within the same subnet, the link will be to that device; if the data is destined for a device outside the subnet, the link will be to the default gateway. The protocol data unit on layer 2 is the frame.
The responsibilities of the data-link layer include placing the data onto physical media, error notifications, and flow control. Error notifications are carried out through the use of a checksum that's included ...
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