Almost finished layer 2

1.txt

@@ -116,3 +116,57 @@ to it as well. Specifically, it adds a header (which is inserted before the pack
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 The header consists of four fields:
+Frame Start - This field indicates the start of a frame (a frame is really just a grouping of bits). 
+Addresses - This field contains the source and destination MAC addresses.
+Type - This identifies the layer 3 protocol that the data uses (more on this later).
+Control - This field contains information that's used for flow control, essentially determining the priority of the packet.
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+The trailer consists of two fields:
+Error detection - This field contains a checksum (a mathematical hash) of the data in the frame. This can be used to ensure that the data wasn't corrupted on the way.
+Frame stop - This field indicates the end of the frame.
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