Re: Several questions about LLC...

"Rich Seifert" <usenet@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

No. Type 3 service is a cobbled-together kludge attempting to achieve
contradictory goals. On the one hand, it purports to be a
"connectionless service", i.e., simple frame exchange without guarantees
of performance. On the other hand, it purports to be an "acknowledged
service", i.e., complexity is added to provide an indication that the
"connectionless frames" were actually delivered.

At the time, I thought the IEEE was trying to design into LLC all of the functionalities of previous standards, including RS-232 and X.25. In this example, wasn't X.25 acknowledged at layer 2? (And, for some frame types, 802.11 also sends ACKs at layer 2.)

Bert

.

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