Networking: topic of discussion at nblug?

Nancy Harrison vulpia at
Sun Jan 23 10:12:53 PST 2000

Date sent:      	Sat, 22 Jan 2000 15:48:57 -0800 (PST)
From:           	Mike <dugan at>
Subject:        	Networking: topic of discussion at nblug?
To:             	nblug <nblug-talk at>
Send reply to:  	nblug-talk at

Dear Mike: I read your networking page with interest. As a clueless 
person, I found that it would be good if you included a completely simple-
minded example for us clueless ones, based on a simple task that
actually takes place on a network: for example, I am at home, I connect
via PPP to the Internet, I call up a browser and click on a URL in
my bookmarks to view the page, I view the page and close the
browser and the PPP connection.
  How would this simple task percolate through all the layers, and
what would be involved at each layer? Assume I have an Intel or
Mac box with an internal modem, connected to my home phone
  Or, for a person on a LAN, at work, say - they log on, they ask for the
grade record for last semester's Biology 666 class, they print this, they
log off. They are using a dumb terminal on a HP-UX system networking
all the departments and offices.  How would the layers work in this
   I know this is a dumb question, but I need to visualize what is 
happening on a more personal level. I like your page a lot - you
did a great job! I just need a bit more help understanding the
concepts of the layers. - Grandma
Mike wrote:
> Hello Everyone,
> There was an announcement a while bacak letting us know that there was
> going to be a discussion of some networking issues at the next few NBLUG
> meetings.
> For a long time, I have been unhappy with many books, web pages, and
> resources that try to explain the ISO OSI 7-Layer Model. Many of them only
> offer a brief, or incomplete review. Some actually get some parts wrong
> (E.G. A Networking Essentials book for people to pass the MCNE.)
> There are a few good resources out there on networking, but are not as
> descriptive as I would like.
> Being unhappy with (insert an item here) often provides a desire to build
> a better (insert same item here). So, I have been working at writing a web
> page that better describes this well known networking model as well as
> other concepts.
> It may be helpful to read this to better understand networking from a
> general point of view. This theory may help to understand the topics being
> discussed at the meetings.
> In addition, an incomplete review of a 5-layer model (often used to
> describe TCP/IP) can be found here:
> (These pages are being created and updated daily.)
> If you find an error in my documents, or do not think I have explained
> something with enough detail, or find general faults with these, please
> send an e-mail directly to me. Include in your e-mail your choice on
> allowing me to publish your name and/or e-mail address for your
> suggestions to the relative sections. (I like to offer proper credit to
> sources that are willing to be identified.) In most of my on-line
> documents, people's comments or partial comments are included in the paper
> itself where they have disagreement or comment, not as a side mark at the
> end. (This can be seen in the very old document I created for a friend;s
> Fujitsu Laptop 790 : 
> and the paper on reverse engineering the net booting procedures for the
> newer macintoshes to make them boot from a Linux box instead of a Mac OS
> X Server:
> Thanks,
> -M

-Nancy Harrison, Life Sciences Dept., Santa Rosa JC (Calif.native plants)

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