04-19-2012
OSI model, communication between same layers but on different machines
Hi friends,
I hope everyone is doing fine. I have this confusion regarding the OSI model. I have been reading a book on datacommunication and networking which discusses the OSI model in great detail. One thing that I can't figure out is the OSI daigram in this book. It shows communication between the upper and lower levels, but it also indicates diagramatically that same layers on two different machines are peers, and communicate with each other directly. I thought that if machine A want to communicate with machine B, it has to transfer the data downwards to its own physical layer, from where it can travel upwards to the upper layers of machine B. I can't understand the concept of same layers on two different machines communicating with each other directly. I hope you will help me understand it.
Looking forward to your wonderful and helpful replies.
Thanks in advance!
9 More Discussions You Might Find Interesting
1. IP Networking
Could anyone give a better picture of visualising the 7 layers in networking ? How the data is sent ...which part of it is taken care of by software and which is hardware related ?
I stumble here everytime I read a book on networking.. (1 Reply)
Discussion started by: seshagiri
1 Replies
2. UNIX Desktop Questions & Answers
what is it??
I looked everywhere but cant seem to find it
also where can I get information about the difference between NFS 2 or NFS 3?? (6 Replies)
Discussion started by: TRUEST
6 Replies
3. IP Networking
after reading a paper about the OSI-model I'm not exactly sure how to look at this model.
Does data (a file) travel from the application level "down" each layer at the client
Application
V
Presentation
V
Session
V
Transport
V
Network
V
Data link
V
|
|
| (Physical)
| (3 Replies)
Discussion started by: J.P
3 Replies
4. Solaris
Dear
After i received a demo license for OSI 9.0 from SUN , i installed the packages . but when i tried to start the osinet deamon ( /etc/rc2.d/S90osinet ) i am getting the foellowing errror
# ./S90osinet start
starting osi daemon/usr/sbin/osinetd cannot find a valid license (STACK 9.0)... (4 Replies)
Discussion started by: itsgeorge
4 Replies
5. Solaris
Hi.
I get the folloing message if i try to start the osinet deamon:
# /etc/rc2.d/S90osinet start
starting osi daemonunable to unload all the osi modules
some OSI applications may be running
unable to start OSI daemon
#
Has anyone an idea what is going wrong?
Answers to mail: (Note... (1 Reply)
Discussion started by: morenqfj
1 Replies
6. Solaris
I'm using OSI version 9.0 with solaries OS , I 'm thinking of analysing the tracing while sending information through OSI layers , I want to analyze exactly the BER data ? Any one could provide an examples , I know the command for tracing these information but i need to understand the bytes travels... (1 Reply)
Discussion started by: atiato
1 Replies
7. Debian
Is there OSI telecom application which can be installed on debian similar to Solstice Solaries OSI ?
I need to get it on debian to build cmise and communicate with Network element . (0 Replies)
Discussion started by: atiato
0 Replies
8. Ubuntu
How can i establish communication between two machines using IPSec in linux?? Do you have any materials or regarding links? or any materials of udp socket programming? (5 Replies)
Discussion started by: elinaz
5 Replies
9. Solaris
dear all,
i am working on test server with solaris 10 , after installing OSI deamon i stopped it for a test now when i am starting again i am getting this message that i ggoled and search evrywhere and haven't any response i will be glade for any help in here mate the error was :
./osinet... (1 Reply)
Discussion started by: semaan
1 Replies
LEARN ABOUT DEBIAN
perlio::via::dynamic
dynamic(3pm) User Contributed Perl Documentation dynamic(3pm)
NAME
PerlIO::via::dynamic - dynamic PerlIO layers
SYNOPSIS
open $fh, $fname;
$p = PerlIO::via::dynamic->new
(translate =>
sub { $_[1] =~ s/$Filename[:ws-./\]*$/$Filename: $fname$/e},
untranslate =>
sub { $_[1] =~ s/$Filename[:ws-./\]*$/$Filename$/});
$p->via ($fh);
binmode $fh, $p->via; # deprecated
DESCRIPTION
"PerlIO::via::dynamic" is used for creating dynamic PerlIO layers. It is useful when the behavior or the layer depends on variables. You
should not use this module as via layer directly (ie :via(dynamic)).
Use the constructor to create new layers, with two arguments: translate and untranslate. Then use "$p-"via ($fh)> to wrap the handle. Once
<$fh> is destroyed, the temporary namespace for the IO layer will be removed.
Note that PerlIO::via::dynamic uses the scalar fields to reference to the object representing the dynamic namespace.
OPTIONS
translate
A function that translate buffer upon write.
untranslate
A function that translate buffer upon read.
use_read
Use "READ" instead of "FILL" for the layer. Useful when caller expect exact amount of data from read, and the "untranslate" function
might return different length.
By default "PerlIO::via::dynamic" creates line-based layer to make "translate" implementation easier.
AUTHORS
Chia-liang Kao <clkao@clkao.org>
COPYRIGHT
Copyright 2004 by Chia-liang Kao <clkao@clkao.org>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See <http://www.perl.com/perl/misc/Artistic.html>
perl v5.8.8 2006-03-06 dynamic(3pm)