network to be secure but also to gain the most return for the smallest investment.

Organizations often do not have the security built into their  infrastructure that is required as the organization grows. When the need  for security increases, someone is often assigned the responsibility of  determining what security measures need to be improved. A network administrator at PPI came to you with a new  task. PPI has a LAN using TCP/IP. They want the network to be secure but  also to gain the most return for the smallest investment. You have been  asked to advise the Global Communications team on LAN security: