Please, help with the questions. Thank you

QUESTION 1

What does the TRAP (INT) instruction do?

		Calls an interrupt handler.
		Restarts the CPU.
		Interrupts the CPU, as if an external device raised an interrupt.
		Terminates the current process.

QUESTION 2

What characterizes a layered OS?

		An upper layer cannot use a lower layer.
		There is no OS kernel.
		A lower layer cannot use an upper layer.
		Higher layers have lower protection.

QUESTION 3

Look at the file /proc/interrupts of any Intel-based Linux computer (such as one in the labs). Which hardware device uses IRQ 0? (MacOS does not have the /proc file system.)

		Parallel port
		Keyboard controller
		Ethernet card
		Timer

QUESTION 4

Run command strace on any Linux machine to intercept the system calls of several programs of your choice (ls, dir, cd, and pwd are some possible examples). What is the first system call in the sequence?

		Different sequences begin with different system calls.
		execve()
		brk()
		open()

QUESTION 5

Which of the following are software abstractions? (Check all that apply.)

		Process
		File
		Port
		Interrupt

QUESTION 6

Which trade-off is involved in the choice of the OS organization in terms of kernel configurability?

		Speed vs Space
		Security vs User-friendliness
		Reliability vs Flexibility
		Cost vs Quality

QUESTION 7

A video game compiled for Windows 10 runs in a separate window on a Ubuntu Linux desktop. What kind of arrangement is this?

		Abstraction
		Virtualization
		Emulation
		Protection