>In the discussion of error correction, I think an error on my part has been
>missed. I was thinking about it and I wonder if this is entirely accurate:
>
>(concerning what happens after a frame is discarded on WAN link)
>
>"The end station will respond by acking the next packet it recieves with the
>appriopriate (lower numbered) sequence number (of the missed packet). The
>originating station will
>get this ack (with the lower sequence number) see that the end station is
>requesting a packet out of sequence and the originating station will begin
>it's next transmission with the data from that particular sequence number."
>
>Is this correct?
Emphasis: end station. You are describing what TCP does. Routers
typically are unconcerned with TCP.
And again, not all applications need reliable links, so not all
applications will have retransmission ANYWHERE in the path.
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