At 01:05 AM 8/28/2001, jacob mathews wrote:
Why is TCP/IP frame check required when the same is
verified by the ethernet MAC?
TCP/IP is designed for INTER-networking. That means that it works through
SEQUENCES of components. Some of the components well might provide strong
data integrity mechanisms. Some might not. Even more important is that
the INTERFACE BETWEEN components might not ensure data integrity.
The TCP checksum is simple (not very powerful) because it is intended only
to catch integrity problems not caught by other mechanisms.
d/
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Dave Crocker <mailto:dcrocker(_at_)brandenburg(_dot_)com>
Brandenburg InternetWorking <http://www.brandenburg.com>
tel +1.408.246.8253; fax +1.408.273.6464