Re: job screening question

[Owen DeLong <owen () delong com>]

On Jul 5, 2012, at 6:28 PM, Jon Lewis wrote:

> On Thu, 5 Jul 2012, William Herrin wrote:
>
> > On Thu, Jul 5, 2012 at 8:22 PM, Owen DeLong <owen () delong com> wrote:
> > > I would use questions such as the following:
> > >
> > > 1.      How many end-sites can be numbered from a single /32.
> > >                (Correct answers: IPv4 - 1, IPv6 - 65,536)
> >
> > IPv6 - 16,777,216 to 268,435,456 :p

I'd accept those if I was willing to send the candidate to rational IPv6 networking re-education camp.
If I expected the candidate to be able to do real work immediately, I would require the correct answer
as specified above.

Assigning a /56 to an end-site is bad juju. Assigning a /60 is pure useless evil.


> > > 5.      What is the reason for the 100m distance limit within an ethernet collision domain?
> >
> > What's an ethernet collision domain? Seriously, when was the last time
> > you dealt with a half duplex ethernet?
>
> 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 :)

Either way, the collision domain itself is irrelevant to the question at hand... The important thing is to find out 
that the candidate understands what an ethernet pre-amble is and why it is important.

Owen