OS also do the protection and security for the system, the security aim to:

• defense of the system against internal and external attack

• unlock the system

• breach the server datas

The sample of protection in Operating System:

Note: The answers may be more than 1

• User ID grouping

• Privilege escalation

• Free access to admin

In virtualization of OS, VMM (virtual machine manager) provides:

• virtualization services

• anti virus services

• hard disk format services

Choose the type of network:

Note: The answers may be more than 1

• Local Area Network (LAN)

• Wide Area Network (WAN)

• Metropolitan Area Network (MAN)

• Social Networking

The type of cloud computing:

Note: The answers may be more than 1

• Public Cloud

• Private Cloud

• Hybrid Cloud

• Original Cloud

The feature of Software as Services (SaaS):

• one or more applications available via the internet

• specific platform available via the internet

• special infrastructure available via the internet

The feature of Platform as Services (PaaS)

• specific application available via the internet

• special infrastructure available via the internet

• software stack ready for application use via the Internet (i.e., a database server)

The feature of Infrastructure as Services (IaaS)

• specific application available via the internet

• servers or storage available over Internet (i.e., storage available for backup use)

• special platform available via the internet

The example of Open-Source OS:

Note: The answers may be more than 1

• Linux

• BSD Unix

• Microsoft

OS activities in mass storage management:

Note: The answers may be more than 1

• Mounting and unmounting

• Free space management

• Storage allocation

• Disk scheduling

• Partitioning