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Transport layer framming question..

hello friends,

I have some query about transport layer..

As we all know that when data passes from session layer to transport layer, Transport layer fragments the data..and then data pass to network layer...

Now I want to know when data reaches at the destination the transport layer of destination machine again get the fragments and join it and make the full data..but how can the transport layer come to know that this is the last fragment of the data...? When we are talking about the sequence no lets say data is fragmented in to 10 small fragments at the sender transport layer..now how receiver transport layer come to know that fragment no 10 is the last one..????

With regards,

Nirav

2 REPLIES
Bronze

Re: Transport layer framming question..

Hi Nirav,

At the IP layer within the header there is a 3-bit field called "Flags". The last bit in Flags is a "MF", or More Fragments. The sender sets it to "0" if it's the last fragment to send.

There is also a fragment offset field which is set to zero upon completion of sending this fragment. This field defines which fragment order each IP packet is.

Does this make sense? Please let me know.

Thanks,

Michael.

Re: Transport layer framming question..

i think he is not talking about the ip layer fragmentation... he is talking about the data coming from application... now how the destination will come to know here is the whole data ended...?

i think, this care is taken by the upperlayer of the OSI...

regards

Devang

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