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Special Forums UNIX Desktop Questions & Answers What are the 7 layers of OSI model or TCP/IP Post 17937 by Perderabo on Thursday 21st of March 2002 09:57:48 AM
Old 03-21-2002
First, please see my post in this thread.

Quote:
Originally posted by Neo
Here is another question:

With N-tier web application services and publish-subscribe architectures in the picture, what are the current layered protocol stack (complexity management) models?
Stuff like this does not modify the basic networking protocols. Rather, it imposes much more order on the application layer. The three tier model, which my company now uses, says that the user should not need a special client for your application. Instead, the user should just use a local web browser. Next, the user should not be expected to learn sql or anything like it to search a database. Some kind of easy to use middleware should interupt the user's needs and figure out what to do. That front-end to our database is complex and multi-layered itself. But we still call the whole concept a three tiered approach.

In the old days, we would have delivered special client software to our customers with its own user interface. And some skill would be needed to search our database. Now our customers just use a web browser and this alone shortens the learning curve. And you could probably teach Lassie to search our database...no sql or anything.

But the whole shebang is running on TCP/IP which has not changed. I don't know what publish-subscribe means, but I doubt that it modified TCP/IP either.
 

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NFSD(8) 						    BSD System Manager's Manual 						   NFSD(8)

NAME
nfsd -- remote NFS server SYNOPSIS
nfsd [-6rut] [-n num_threads] DESCRIPTION
nfsd runs on a server machine to service NFS requests from client machines. At least one nfsd must be running for a machine to operate as a server. Unless otherwise specified, four servers for UDP transport are started. The following options are available: -r Register the NFS service with rpcbind(8) without creating any servers. This option can be used along with the -u or -t options to re-register NFS if the portmap server is restarted. -n Specifies how many server threads to create. The default is 4. A server should run enough threads to handle the maximum level of concurrency from its clients. -6 Listen to IPv6 requests as well as IPv4 requests. If IPv6 support is not available, nfsd will silently continue and just use IPv4. -t Serve TCP NFS clients. -u Serve UDP NFS clients. For example, ``nfsd -t -u -n 6'' serves UDP and TCP transports using six threads. nfsd listens for service requests at the port indicated in the NFS server specification; see Network File System Protocol Specification, RFC 1094 and NFS: Network File System Version 3 Protocol Specification. The nfsd utility exits 0 on success, and >0 if an error occurs. SEE ALSO
nfsstat(1), nfssvc(2), mountd(8), rpcbind(8) HISTORY
The nfsd utility first appeared in 4.4BSD. BSD
March 17, 2008 BSD
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