Good answer, ElephantChild.
Also, the one I was thinking of was TFTP. With TFTP, when the client wants
to download a file, it simply sends a Read Request. In the absence of any
errors, the response from the server is the first block of data. Each block
is acknowledged. The session ends when the server sends a block that is
smaller than the default block size of 512 bytes. To send a file, the
client sends a Write Request. The server sends an ACK, and then the client
sends 512-byte blocks, each of which are acknowledged.
I'm not sure about NFS, which runs on top of Sun's RPC which is
transaction-oriented. Hmmmmm. Yes, I think I do agree as I think more about
it. There's no connection establishment, but data is acknowledged. Maybe
NFS, RPC, SNMP, and DNS would all be considered transaction-based, which is
sort its own category outside the basic categories of connection-oriented
and connectionless.
Priscilla
At 03:36 AM 12/17/00, ElephantChild wrote:
>On Sat, 16 Dec 2000, Priscilla Oppenheimer wrote:
>
> > You're right, LLC Type 3 doesn't appear to be in the IEEE Logical Link
> > Control 802.2 specification.
>
>...
>
> > Study question: are there any other examples of protocols that use
> > acknowledgements but don't require a connection establishment? I can think
> > of one that we use quite regularly...
>
>(humming to myself for a minute - skip to next message if you don't
>want to see the answer)
>
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>Hmmm
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>Hmmmmmmmmm.
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>Hmmmmmmmmmmmmdedummmmmmmmm.
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>(glances at watch) OK, here goes:
>
>Many client-server protocols fall in that category: DNS, NFS, RPC, SNMP,
>...; the server's answer is an acknowledgment of the client's request.
>
>OSPF does *not* fall in that category. The requirement for adjacency
>setup makes it a connection-oriented protocol IMHO.
>
>--
>"Airplane travel is nature's way of making you look like your passport
>photo." --- Al Gore
________________________
Priscilla Oppenheimer
http://www.priscilla.com
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