[154569] in North American Network Operators' Group
Re: job screening question
daemon@ATHENA.MIT.EDU (Randy)
Thu Jul 5 22:11:12 2012
Date: Thu, 5 Jul 2012 19:10:32 -0700 (PDT)
From: Randy <randy_94108@yahoo.com>
To: William Herrin <bill@herrin.us>
In-Reply-To: <CAP-guGWDxzoGCBj-RFrG62w-KeuqvWT7002-YZDphY7BMW1e6w@mail.gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
--- On Thu, 7/5/12, William Herrin <bill@herrin.us> wrote:
> From: William Herrin <bill@herrin.us>
> Subject: Re: job screening question
> To: "Jon Lewis" <jlewis@lewis.org>
> Cc: "nanog@nanog.org" <nanog@nanog.org>
> Date: Thursday, July 5, 2012, 6:43 PM
> On Thu, Jul 5, 2012 at 9:28 PM, Jon
> Lewis <jlewis@lewis.org>
> wrote:
> > You've never (much less recently) seen a customer
> misconfigure their end of
> > an ethernet handoff such that you end up with duplex
> mismatch? Granted, in
> > that case, distance is irrelevant...but it is half
> half-duplex ethernet :)
>
> If I was asking an ethernet question, I'd rather ask:
>
> 1. How do you make a crossover ethernet cable to connect two
> switches?
> (cross the green and orange pairs)
>
> 2. What happens if you plug that cable into a pair of
> gigabit ethernet
> switches? (mdix malfunctions, ports negotiate to 100 full,
> on some
> poorly implemented switches the mix of straight and crossed
> wires
> eventually damage the ports so they can no longer do gige)
>
> Regards,
> Bill Herrin
Or for that matter, in the absence of auto-MDI/MDIX:
1) when is a straight-through cable *required*?
2) when is a cross-over cable *required*?
How about another HR-Question:
what do 0.0.0.0/1 and 128.0.0.0.0/1 as static-routes accomplish?
./Randy
