If you connect you workstation directly to a router both would are layer 3
devices, and would require a crossover cable. If you connect two Cisco
routers you need to use a crossover cable (DCE-DTE back-to-back) because
both are layer 3 devices. When connecting a Workstation(layer 3) to a
Switch(layer 2) you use a straight through cable. Each of these scenarios
prove Bernard's basic rule. Your example about a PC and a modem also proves
his point. A workstation is a layer 3 device because it is using TCP/IP (or
IPX). The modem is a layer 2 device, using PPP as a Layer 2 protocol.
Therefore you do not need a crossover cable between the two. After the modem
connects to ISP (with PPP), TCP/IP can travel over the link. You can also
think of it as workstation is a DTE and modem is a DCE, because that is true
in that case.
Tim
----- Original Message -----
From: "Jojo" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, October 16, 2000 8:22 PM
Subject: Re: cross-over roll-over : Here is THE simplest rule
> How about when you connect a workstation to a modem will this rule apply?
I
> think not.
> This rule will only be applicable to LAN devices but for WAN devices the
> rule as Sebastian pointed out should be applied.
>
>
> >>The rule is:
> >>connecting devices of the same OSI layer, use cross-over cable.
> >>connecting devices of different layers, use straight through.
> >>A workstation is considered layer3.
> >>
> >>Bernard
>
>
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