You are the administrator of a large network. At the moment you are using IP 207.200.16.0/24 for muliticasting purposes. Your CEO wants to add 2000 pc's to your network, and make sure the current subnet can deal with an extra 2000 workstations. Should you:

A. 200.17.0-207.200.24.0

B. 200.33.0- 207.200.48.0

C. 200.16.0/20

D. 200.16.0/22 - 207.200.16.0/23

Most chooses C. Any idea how it works, cause I only know multi-casting ia the act of transmitting a message to a select group of recipients.

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I think the subnet mask is 20 ie 255.255.240.0 as leaves 12 bits spare ie 2048 hosts - could be wrong though as I haven't yet properly covered multicasting in my studies.

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hi Freddyformat, thanks for sharing your views.

A bit of re-reading, indeed, it's a Classless Inter-Domain Routing (CIDR) network, also described as "slash x" network. The 'x' is a number ,representing the number of bits in the IP address range that the InterNIC controls.

So in this question, the current IP's addressess(/24 or class C network) is not sufficient, because 2 to the power of 8, gives 256 hosts.
Therefore, by requesting a "200.16.0/20" CIDR network, as the 'x' is the number of bits being controlled by IANA, so 32bits minus 20 bit, remainder 12 bits, which is 2 to the power of 12, giving more addressess other then required.

So quiz seems to test on TCP/IP, not 'multicasting'. Correct me if I'm wrong.

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I think you're right.

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To let you all know 207.17.0.X is not a multicast address it is a class c address. Multicast is from 224-239.

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ITs actually an insane question.
Fistly your starting with only a class C
You can`t supernet what you dont have.
Also nobody who knew what was what would put 2000 hosts on a subnet.
And lastly I`m not sure what multicasting has to do with this at all.
Maybe some info was left out of the question.
I hope someones instructor didn`t write this question.

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This question is incomplete and could never be worked out!!

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quote:

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Originally posted by wbafrank
This question is incomplete and could never be worked out!!

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" When asked if he felt discouraged by the 1,073 failures he had before inventing the electric light bulb, "I did not fail 1,073 times; I found 1,073 ways not to do it."

Thomas Edison.

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