code:

You've just been hired as a Network Administrator for a 
large International firm.  As the "new guy" to the team, 
you've been assigned the CIO's latest task - IP address 
allocation of the rfc 1918 192.168.0.0 private 
addressing for the 5 subsidiaries.  In addition to the 
following requirements, the addresses must be summarizable:  

Parent Company - First block of addresses, and must 
support 400 people, 40 printers, and 50 servers

Company A has 150 people, 30 printers, and 50 servers in 
their corporate offices, plus 12 retail stores that 
require 10 IP addresses each.

Company B has 2 corporate offices with 300 people, 50 
printers, and 150 servers in each building.

Company C has 24 small field offices with 3 PCs and a 
router, plus a corporate office with 100 people, 8 printers, 
and 20 servers (but plans to add up to 50 more devices 
in the next two years)

Company D has three mid-size offices and a data center.  
Each office has about 75 people, 10 printers, and 3 servers, 
and the Data Center has 20 people, and 300 servers. 

Company E has a small corporate office of 35 people and 10 
printers, but has a large sales staff of 450 across the 
country who VPN from their home offices (each user must 
have their own IP address assigned for access to network 
resources). 

code:

Your boss forgot to send you the email about the new site scheduled 
to be brought up in 1 hour.  It must have enough IP addresses 
to support the current 10 people, printers, and network equipment, 
plus have room to grow to 30.  
Which of the following IP addresses would satisfy the requirements?

A. 10.192.168.64/29
B. 192.168.10.64/27
C. 172.16.10.64/28
D. 10.172.31.0/28

Answer:  B - /27 mask provides for up to 30 hosts