Hi,
When we refer to layer 2 and layer 3 devices we are referring to the OSI 7
layer model, you wont see any devices at layer 1 as this is the physical
layer, i.e. the cable electrical signals are passed along or the fibre that
light is transmitted across, layer 4 is the transport layer which TCP works
at where as layer 3 network layer which is where IP operates.
FYI
TCP/IP is actually 2 protocols each working at a different layer
We usually refer to routers as layer 3/4 devices and switches/hubs/bridges
as layer 2 devices although switches are increasingly starting to look at
layers 3/4 and in some all the way though to layer 7 otherwise known as
application layer switching.
Regards
Alex
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Zachary Uram
Sent: 10 June 2001 19:30
To: Rene Wijninga
Cc: [EMAIL PROTECTED]
Subject: Re: analyzing traceroute ouput
what are layer 1 and layer 4 type devices?
are there any tools to probe such devices since traceroute only
works on layer 3?
On Sun, 10 Jun 2001, Rene Wijninga wrote:
> Hi James,
>
> A traceroute is done on the layer 3 level (IP) whereas a bridge is a layer
2
> device (MAC layer), unaware of layer 3 information. So a traceroute will
> only show you layer 3 info, and not layer 2. So the answer is no, only
layer
> 3 devices like routers will show up in a traceroute, not layer 2 devices
> like switches.
>
> Regards, Rene
>
> ----- Original Message -----
> From: "Saint James" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Sunday, June 10, 2001 11:42 AM
> Subject: Re: analyzing traceroute ouput
>
>
> > Is there anyway to make traceroute show any additional
> > devices/nodes, like
> > bridges ?
> >
> > James
> >
> >
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