Operating System question and answer

30. What are DDks? Name an operating system that includes this feature.
DDks are device driver kits, which are equivalent to SDKs for writing device drivers. Windows NT includes DDks.

31. What level of security does Windows NT meets?
C2 level security.

32. What is page cannibalizing?
Page swapping or page replacements are called page cannibalizing.

33. What has triggered the need for multitasking in PCs?

1. Increased speed and memory capacity of microprocessors together with the support fir virtual memory and
2. Growth of client server computing

34. What are the four layers that Windows NT have in order to achieve independence?

1. Hardware abstraction layer
2. Kernel
3. Subsystems
4. System Services.

35. What are the stipulations of C2 level security?
C2 level security provides for:

1. Discretionary Access Control
2. Identification and Authentication
3. Auditing
4. Resource reuse

36. List the Coffman's conditions that lead to a deadlock.

1. Mutual Exclusion: Only one process may use a critical resource at a time.
2. Hold & Wait: A process may be allocated some resources while waiting for others.
3. No Pre-emption: No resource can be forcible removed from a process holding it.
4. Circular Wait: A closed chain of processes exist such that each process holds at least one resource needed by another process in the chain.