Ok, I thought. "I'll try to find the paper at the ISO web site". I did. They
want 123.90 CHF ($68.99) for a 31 page paper. The heck with the certs I want
to work with these guys :-)
--
James Haynes
Network Architect
Cendant IT
A+,MCSE,CCNA,CCDA,CCNP,CCDP
""Priscilla Oppenheimer"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> ARP was developed without reference to the OSI reference model. That's the
> easiest way to think about it. ;-) Cisco books that coerce protocols into
> the strict 7 layers are simplifying the truth. In many cases a protocol
> doesn't fit into a linear stack. ARP lies in a control plane. Its
> functionality is similar to call setup tasks in a WAN network.
>
> To understand ARP it helps to use the ISO document called "The Internal
> Organization of the Network Layer," which relaxes the rigid boundaries
> between Layer 2 and Layer 3. ARP resides in the Subnetwork Dependent
> Convergence Facility. Lots of words but if you think about them, they make
> sense.
>
> Howard has answered this question a ZILLION times. Check the archives. I'm
> sure he says it much better than I do. ;-)
>
> Priscilla
>
> At 11:50 AM 6/13/01, John Neiberger wrote:
> >This topic has come up a few times in the past and I don't think we ever
> >came to a common agreement. Several people made good arguments on both
> >sides. I don't recall the specific argument, but I believe someone even
> >made a convincing argument that it was an application layer function.
> >Perhaps someone here remembers that thread and could refresh our
> >memories.
> >
> >When most people think of host-to-host communications they think of one
> >layer on one device speaking to the corresponding layer of another
> >device. In this case of ARP I personally feel that we have the network
> >layer of one device speaking to the datalink layer of another. Even
> >that point is a little shaky because at the destination the packet must
> >reach the network layer to be recognized, but the information desired
> >from the end station is layer two, not layer three.
> >
> >I would also suggest that we determine the layer at which a function
> >resides by looking at the layer that originated the request for
> >information. In this case, it's the desire of the network layer in one
> >device to speak to the network layer of another device that initiates
> >this entire process. An ARP is generated at the request of the network
> >layer. This ARP seeks out the destination device, gathers the necessary
> >information, and delivers that information to the network layer of the
> >originating device.
> >
> >Because of those two arguments I'd say that the ARP function overlaps
> >both the network and datalink layer. It is a datalink frame generated
> >at the request of the network layer, and it just doesn't fit perfectly
> >into either layer.
> >
> >Then again, I may be wrong. :-)
> >
> >Regards,
> >John
> >
> > >>> "Dr Rita Puzmanova" 6/13/01 7:58:53 AM >>>
> >Hi all,
> >
> >Trivial yet fundamental question. I have seen ARP described as part of
> >the network (internet) layer so many times that I have started to
> >believe it belongs there (although I know well that it operates "as
> >if"
> >the Layer 2 protocol - as per OSI RM). Now I have eventually come
> >across
> >Doug Comer's statement: "It's part of the network interface layer."
> >
> >I should not ask where the truth is but still I will. That would mean
> >quite a lot of books are incorrect in this (including Cisco
> >materials).
> >
> >Rita
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=8507&t=8335
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
