job screening question

Fri Jul 6 02:10:32 UTC 2012

--- On Thu, 7/5/12, William Herrin <bill at herrin.us> wrote:

> From: William Herrin <bill at herrin.us>
> Subject: Re: job screening question
> To: "Jon Lewis" <jlewis at lewis.org>
> Cc: "nanog at nanog.org" <nanog at nanog.org>
> Date: Thursday, July 5, 2012, 6:43 PM
> On Thu, Jul 5, 2012 at 9:28 PM, Jon
> Lewis <jlewis at 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