Operating System (OS)
The virtual memory is

A type of memory used in super computer
An illusion of extremely large main memory
An extremely large main memory
An extremely large secondary memory

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Operating System (OS)
Semaphores

are used to do I/O
synchronize critical resources to prevent contention
are used for memory management
None of these
synchronize critical resources to prevent deadlock

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Operating System (OS)
Link encryption

None of these
is less secure than end-to-end encryption
is used only to debug
is more secure than end-to-end encryption
can not be used in a public network

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