code:

Given the following IP address and mask, provide the 
class, network ID, # subnets, and # of hosts per net:


Address/mask        Class  Net ID              #subs    # hosts
==================  =====  ==================  =======  ========
___.___.___.___/__    _    ___.___.___.___/__  _______  ________

72.53.144.12/20       
4.192.255.61/8        
232.214.7.101/23      
172.17.142.7/20       



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Here's the previous question and its answer:


Congratulations!  You just acquired the mobile sales
force from your competitor!  Now you need to expand 
the scope of your remote access VPN pool (10.172.0.0/23) 
to accommodate the additional 400 staff.  

Which of the following will satisfy your VPN users?

A. 10.172.0.0/24
B. 10.172.2.0/22
C. 10.172.4.0/22
D. 10.172.0.0/22

Answer:  C and D both will supply the required 1020 
maximum hosts, but D is actually the expansion of the 
existing addresses, as requested.  Tricky, I know, but 
that's what you've got to be prepared for!