home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.protocols.tcp-ip
- Path: sparky!uunet!ukma!bogus.sura.net!howland.reston.ans.net!spool.mu.edu!sgiblab!newsun!donp
- From: donp@novell.com (don provan)
- Subject: Re: Info wanted on TCP/IP vs OSI 7 layer
- Message-ID: <1993Jan28.073137.7195@novell.com>
- Sender: news@novell.com (The Netnews Manager)
- Nntp-Posting-Host: na.sjf.novell.com
- Organization: Novell, Inc., San Jose, California
- References: <SALKIELD.93Jan26224429@csqx.cs.rhbnc.ac.uk> <1993Jan27.115319.21112W@lumina.edb.tih.no>
- Date: Thu, 28 Jan 1993 07:31:37 GMT
- Lines: 33
-
- In article <1993Jan27.115319.21112W@lumina.edb.tih.no> ketil@edb.tih.no (Ketil Albertsen,TIH) writes:
- >Then you have the fighting young priests, making detailed comparisons
- >for the sole purpose of showing how useless (wretched or whatever) one
- >alternative is, compared to the other.
-
- Actually, what they usually show is how dismal the OSI model is for
- analysis. Even the OSI protocols don't "fit" the OSI model in any
- significant analytical sense, with most of the layers turned sideways
- to allow functions to slip up or down at will.
-
- The OSI model is useful mainly for its descriptive properties.
- "Network layer" implies certain functionality which helps in
- conversation, but in practice that functionality is rarely contained
- in a neat layer between datalink and transport. Ironically, it's the
- OSI protocol suite itself which has the most drastic examples of
- non-layering, although any competent network expert will tell you that
- that, in itself, is not a deficiency.
-
- >In article <SALKIELD.93Jan26224429@csqx.cs.rhbnc.ac.uk>,
- >salkield@csqx.cs.rhbnc.ac.uk (Tom Salkield) writes:
- >>I am posting on behalf of a friend who needs to compare the layers of
- >>the internet protocol suite with the OSI seven layer model as part of
- >>his course assignment.
-
- Your friend would probably find it easier to do his homework himself.
- It doesn't take a significant amount of information about TCP/IP and
- the OSI model to do this analysis. I doubt that cribbing the answer
- from some other source will acheive the educational goal that your
- friend's instructor had in mind. And it's certainly not the kind of
- thing worth bothering thousands of people about.
-
- don provan
- donp@novell.com
-