Discuss the protocols and tools for providing secure VPN services

Explain the memory management model of Linux Operating System

Answer the following questions related to Linux commands:

• List all the directories using echo command only

• List all the files within a directory including hidden files • Display a Calendar for a specific month and year

• What will be the output of the following: who| more who –a cat file name | more ℓs- ℓ > temp

• What options can be used with a grep command? Show output with each option

Discuss the key characteristics of a modern operating system

What is the default location of the print spooler in Windows NT?

Explain functions of Primary Domain Controller. Also, explain the role of the 'primary domain controller' and 'backup domain controller' in enhancing security of window 2000 server.

Discuss the basic design issues in distributed OS which are different from traditional OS and network OS and how are they implemented?