>> So transport layer should somehow enhance
>> the error check and/or correction mechanism.
>
> actually, I would put it in the application layer. I would have the
> application include some form of checksum (PGP signature, file CRC,
> whatever) to ensure for itself that what was sent was what was received.
If there is no error recovery at the link layer, then an erronious
set high-order bit in a packet length field might very likely leave
input processes open listening for more data that will never come.
But I agree that redundancy is a good idea.
By the way, on the storage technology front, it seems that 3.4
terabytes will soon be pocket-sized and cost about $50 (!)
http://www.keele.ac.uk/research/cmrkeele.htm
Cheers,
James
