John's right on track here. When using the /19 notation with 172.16.0.0,
you're referring to that specific network. 172.16.0.0/19 is not the same
network as 172.16.64.0/19.
Reading this question a little bit differently, I can see that perhaps
there is a typo...if the question used a /18 instead of a /19, then answer
"A" would be correct.
If you want to make answer "D" correct, you either need to rephrase the
question to "Which one is a valid host using 172.16.64.0/19?" or rephrase
the question to "Which one is a valid host using 172.16.0.0/17?", which
would allow for ALL of the answers to be correct.
Craig
At 10:13 AM 3/15/2001 -0700, you wrote:
>I disagree. Valid hosts in 172.16.0.0/19 are:
>
>172.16.0.1 through 172.16.31.255
>
>I guarantee you that any other interpretation will make life miserable
>for you eventually, especially in a production environment where you
>actually use CIDR or VLSM. A good example would be if you were running
>BGP in a production environment that actually connected to the internet.
>
>
>Let's say you were Joe's ISP and were assigned 172.16.0.0/19. This is
>*very* specific...you can only advertise 172.16.0.1 through
>172.16.31.254. Most likely, 172.16.32.1 through 172.16.63.254 is going
>to be assigned to someone else. If you followed your logic and
>advertise the entire 172.16.0.0/16, you will be getting some nasty phone
>calls or nastygrams in your email box. Companies tend to get a little
>upset with you if you start advertising their address block.
>
>In that spirit, I assume when a test question says something as
>specific as 172.16.0.0/19 that they *really* mean it.
>
>John
>
> >>> "Lowell Sharrah" <[EMAIL PROTECTED]> 3/15/01 9:54:56 AM >>>
>I believe that answer D is correct and here is why
>
>Vaslid hosts in the network 172.16.0.0/19 are as follows
>
>172.16.64.1-172.16.95.254
>172.16.128.1-172.16.159.254
>172.16.192.1-172.16.223.254
>172.16.32.1-172.16.63.265
>172.16.160.1-172.16.191.254
>172.16.96.1-172.16.127.254
>.255 is broadcast
>
> >>> "John Neiberger" <[EMAIL PROTECTED]> 03/15/01 11:19AM
> >>>
>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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