1
1
If I am correct, at a source node, the network layer passes the datagram to the link layer. Then the link layer breaks the datagram into frames, and move entire frames from one network element to an adjacent network element.
I was wondering at the destination node, does the reassembling of frames into datagrams happen in the link layer or the network layer? Does the link layer pass frames or datagrams to the network layer?
Generally, at a source node, when passing from a higher layer to a lower layer, does the breakdown of bigger data units into smaller data units happen in the lower layer.
At a destination node, when passing from a lower layer to a higher layer, does the reassembling of smaller data units into bigger data units happen in the lower or higher layer?
Thanks and regards!
"link layer" rings a bell with me for some reason, but a quick search shows it's called the "data link layer" in the ISO OSI model. not "link layer". and the "data link layer" has a logical link is split into 2 sublayers - logical link control, and media access control http://www.microsoft.com/mspress/books/sampchap/5507a.aspx http://www.microsoft.com/mspress/books/sampchap/5507/0735614563-06.gif
– barlop – 2012-03-18T04:56:07.680also, and i may be wrong, but I think when going down the layers, the data is getting -bigger-. it's assembly(to use your term). and up the layers it's getting smaller, disassembly. (that's the opposite of what you wrote), I guess i'm correct there 'cos I see from some comments that you expressed some doubt yourself(which is good), and your terminology is definitely wrong like "network element" I think you made up that term. – barlop – 2012-03-18T05:00:24.243