Okay, let's rephrase the question:
You have variably subnetted 172.16.0.0/16 using a /19 mask. Someone
working with you is configuring a server to be placed at a remote
location that is on the 172.16.0.0/19 network, and he asks you for a
valid host address.
Would you tell him to use 172.16.80.255? I don't think so. You would
make sure he uses an address from the 172.16.0.0/19 subnet, so it would
have to be in the range 172.16.0.1 through 172.16.31.254.
And for the very same reason, I feel that D is not a good answer as the
original question is worded.
John
>>> "Lowell Sharrah" <[EMAIL PROTECTED]> 3/15/01 11:10:10 AM >>>
this is assuming vlsm. when you have a class network with varibale
bits in the subnet mask that is different than the default subnet mask,
you have multiple subnets and multiple host on each subnet. This
question is telling us that there are 3 bits as subnet bits (since the
default for class B networks is 16) and the remaining 13 are host bits.
This arnagement (172.16.0.0/19) calculates out to be more than one
subnet and answer d falls in one of the valid subnet ranges. If thew
question was worded differently with a particular subnet such as
172.16.30.x/19, then it would not be true.
>>> "John Neiberger" <[EMAIL PROTECTED]> 03/15/01 12:04PM
>>>
How could the wording be correct? 172.16.80.255 is a host address in
172.16.64.0/19, *not* 172.16.0.0/19. There is no correct answer
provided to that specific question as worded. I agree that it is
trying
to be a trick question, but it fails because of poor wording or a typo.
Perhaps one of the answers should have been 172.16.15.255 or something
like that. That would have been tricky yet also correct given the
question that was being asked.
John
>>> "Arthur Simplina" <[EMAIL PROTECTED]> 3/15/01 9:51:53 AM >>>
I think the trick part of question here is that the answer d.
172.16.80.255
seems like a broadcast address because of the 255 (all 1's in the last
octec.) So now the test taker faces the dilemna of choosing between
two
subnetwork addressess and two "broadcast" addresses.
Cisco would want to know if you really know subnetting. Hence, the
wording
of the question (which to my opinion is still correct).
Arthur
>From: "John Neiberger" <[EMAIL PROTECTED]>
>Reply-To: "John Neiberger" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Re: Sample CCNA test question..bogus?
>Date: Thu, 15 Mar 2001 09:19:53 -0700
>
>I think I'll side with those who say there is no correct answer, but
>there is an answer that's closer to being correct than the others.
:-)
>
>The question is asking for a valid host in the 172.16.0.0/19 range.
>Answer D is not in that range! It is in the 172.16.64.0/19 network.
>Valid host addresses in the 172.16.0.0/19 range are:
>
>172.16.0.1 through 172.16.31.254
>
>I would agree that by making a subtle adjustment to the question,
>answer D is the only answer possible. Given a /19 prefix length, the
>only possible host address given in the answers is D, which forces us
to
>change the question to fit the answer.
>
>This just appears to be a poorly worded question that not only allows
>you to figure out the most-correct answer eventually but also forces
you
>to deduce what the actual question is in the first place. <g> In
other
>words, it's a typical Cisco test question!
>
>Regards,
>John
>
> >>> "Arthur Simplina" <[EMAIL PROTECTED]> 3/15/01 8:46:27 AM
>>>
>d. 172.16.80.255
>
>This belongs to subnet 172.16.64.0 with host range of 172.16.64.1 -
>172.16.95.254.
>
>Arthur
>
>
> >From: "Bruce" <[EMAIL PROTECTED]>
> >Reply-To: "Bruce" <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: Sample CCNA test question..bogus?
> >Date: Thu, 15 Mar 2001 15:11:07 +1100
> >
> >Q. Which one of the following is a valid host using the address of
> >172.16.0.0 /19?
> >
> >a. 172.16.32.0
> >
> >b. 172.16.64.0
> >
> >c. 172.16.63.255
> >
> >d. 172.16.80.255
> >
> >
> >
> >Which one and why?
> >
> >(I say none of them. Am I going mad?)
> >
> >
> >
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