Tom, Thanks for your response but I beg to differ. I agree that answer D
falls inside the range of the 64 subnet as you explain, but this is not the
question. The question asks for a valid host using 172.16.0.0/19, not
172.16.64.0/19
By my reckoning, the valid host range is 172.16.0.1 to 172.16.31.254
Regards,
BR.
"Tom Lisa" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Well, since I'm not a qualified psychiatrist I don't want to comment on
your mental
> health, but there is a correct answer here. If we go to binary it all
becomes clear.
>
> The /19 means that the first 19 bits are network/subnetwork bits and the
remaining 13
> bits are host bits. Therefore our mask would look like this:
> 11111111.11111111.11100000.00000000
>
> Since the first two octects are identical, we can dispense with them and
concentrate on
> the first 3 bits of the third octet and the remaining host bits.
>
> Our subnet addresses would be as follows:
>
> X.X.00000000.00000000 = X.X.0.0 Hosts = X.X.0.1 - X.X.31.254 Bdcst =
X.X.31.255*
> *Assumes Subnet Zero Allowed
> X.X.00100000.00000000 = X.X.32.0 Hosts = X.X.32.1 - X.X.63.254 Bdcst =
X.X.63.255
> X.X.01000000.00000000 = X.X.64.0 Hosts = X.X.64.1 - X.X.95.254 Bdcst =
X.X.95.255
> X.X.01100000.00000000 = X.X.96.0 Etcetera, Etcetera....
> .
> .
> Etcetera (You get the picture)
>
> From this you can see that:
> answer A is the "wire" address of the 32 subnet
> answer B is the "wire" address of the 64 subnet
> answer C is the Broadcast address of the 32 subnet
> answer D falls within the valid host range for the 64 subnet and is
correct.
>
> BTW, a good source for learning IP Addressing & subnetting is:
www.learntosubnet.com
>
> HTH,
> Prof. Tom Lisa, CCAI
> Community College of Southern Nevada
> Cisco Regional Networking Academy
>
>
> Bruce wrote:
>
> > 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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