[Year 12 SofDev] SD key knowledge

Wed Mar 9 21:42:01 EST 2011

Hi,
Just adding to the conversation,

The physical layer is just that - the actual cable, whether cat 5 or other.

As you progress up the layers, the data link layer is your protocols for
your network card to get the signals on and off the cable and the next layer
up (the network layer) is where the data gets formed into packets and
addressed - logical address/Mac address.  
After that the transport layer is where the data gets chunked for
transmission or reassembled on reception into a data stream.

Most people talk about TCP/IP as if they were  together yet they each
represent a different layer in the OSI model.  TCP being in one layer and IP
in the other.  
The only reason I see them as being important is that they flow down from
the above layers to allow the data stream to be broken down into packets,
addressed, etc so they can go out on the cable or visa versa. 
 Each layer is as important as the one above or below.  If one layer doesn't
function correctly then the data can be lost or not sent/received/corrupted,
etc.
We can use different tests to test the layers in a network - ping as an
example -  ping a domain name - www.microsoft.com, ping localhost, or ping a
specific ip address on a network to check that different layers  e.g link,
etc  are working correctly.

This link may be of useful reference http://tools.ietf.org/html/rfc1122

Regards
Malcolm Carson
Glenmore Park High School, NSW

-----Original Message-----
From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au]
On Behalf Of David Dawson
Sent: Wednesday, 9 March 2011 1:37 PM
To: sofdev at edulists.com.au
Subject: Re: [Year 12 SofDev] SD key knowledge

My guess is that it means the 'physical layer' relates to 'network
standards' in Hardware, like the electronics and microtechnology in modems
and network cards, SIMS etc; connections like CAT 5 and 802.11 wireless
transmission - which then must send packets via a standard communication
protocol (TCP/IP) for transmission of data across the Internet and LANs.
Hence this relationship points to a universal standard for Internet
connection devices.
Let me know if I am warm ..... 

David Dawson
Head of Information Technology Learning Area Head of Learning Technologies
St Kilda Rd Campus Wesley College
577 St Kilda Rd
Melbourne 3004
Ph 8102 6340
Mob 0425 718147

>>> sofdev-bounces at edulists.com.au 03/09/11 1:21 PM >>>
SD U3O1 KK04
Purposes and functions of the physical layer (Layer 1) of the OSI and the
relationship of the physical layer to the Transmission Control
Protocol/Internet Protocol model

For quite some time now I've been avoiding this KK because I'd rather clean
a dead dog's ears than spend time on the OSI.

But in the end I had to find the cotton buds and get stuck in, and I think I
have a reasonable overview of the OSI and how TCP/IP maps to it.
 (even produced a draft slideshow).

But the second part of KK04 really has me baffled: the relationship of the
physical layer to the Transmission Control Protocol/Internet Protocol model.
I know that TCP/IP's Network interface layer maps to OSI's physical layer
(and the data link layer), but for the life of me I can't see how it's any
more significant than any of OSI's or TCP/IP's other layers.

Can someone suggest why the relationship between the OSI physical layer and
TCP/IP is so significant?  
Has this relationship been in the papers?  Has this physical relationship
resulted in offspring?
Is Mr OSI going to be on Oprah... or the Jerry Springer show?

--
Mark Kelly
Manager of ICT, Reporting, IT Learning Area McKinnon Secondary College
McKinnon Rd McKinnon 3204, Victoria, Australia Direct line / Voicemail: +613
8520 9085, Fax +613 9578 9253 kel at mckinnonsc.vic.edu.au

VCE IT Lecture Notes: http://vceit.com
Moderator: IT Applications Edulist

All generalisations are false, except this one.

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