Im trying to understand subnetting, and I end up just getting confused as hell and i have a test on this next week and i can't solve the darn thing. I have an IP address 172.16.88.4/21my submask would be 255.255.11111000.0decimal form=248. 255.255.248.0n=8(my increment bits)So now I have to find 5 things. a) subnet IDb)First Usable addressc)Last Usable addressD) Broadcast addressE) total number of host per subnet( I already know how to solve, the method my professor showed me was just to count the remaining zeroes in the submask binary format and use that as the power of M, 2^m-2=2046 in this case)But I get confused as all hell on the rest. Any help I can get, I'll be grateful. I need to learn how to do this by head, so no calculator for me.