Network Management: Question about calculating network,host and broadcast a

I would like to say i am new to this forum and I do not know if this is the right place to post this but i am currently in a cisco academy for CCNA and if anyone else is in this class i am stuck @ 6.2.2 in the online cisco material.....
given the following address/prefix of 141.124.88.174/30
enter the last octet in binary of the network,
I am totally lost @ how to find the network octet i know /30 means the first 30bits are network and the last 2 are host i also know the last octet is 10101100 or 172
my question how do you get .174 to .172??? if you are wondering how i know the answer --it is in the book i just dont know how to do it on my own :)
thanks much

Eric
My sense is that you may have skipped a step (or maybe I skipped in understanding your post). The best way to explain this is to refer to binary - which you have started to do.
For address ...174 the last octet is 101011 10 (in which 101011 represent the network bits and 10 represent the host bits). To find the network bits make the host bits all binary 0 - which means that the subnet address is 101011 00 or 172.
So the answer to your question is that you get from 174 (host address ) to 172 (network address) by changing all host bits to binary zero.
HTH
Rick

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