John,
While your answer is technically accurate. The fact remains that
unfortunatly the Cisco tests will throw poorly worded questions at you and
you simply need to figure out the "best" answer sometimes. It is a painful
truth. So, for the test you answer "D", for real life, you get
clarification before answering.
Tom McNamara
MCSE, CCNA
Account Manager, U.S. Datacom
[EMAIL PROTECTED]
Direct line: (407)398-6521
Toll-Free: (800)216-5517
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
John Neiberger
Sent: Thursday, March 15, 2001 12:14 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: Sample CCNA test question..bogus?
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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