Question $36(1\mathrm{.}25$ points$)$

$\_\_\_\_\_\_\_$ refers to data transfers initiated by a CPU under driver software control to access registers or memory on a device.

Question $36$ options:

Data$-$out registers

Programmed I$/$O

Status registers

Data$-$in registers

Question $37(1\mathrm{.}25$ points$)$

A common OS design is to allow I$/$O calls performed via system calls... why?

Question $37$ options:

system calls are faster

to enforce sync between CPU & I$/$O controller device

system calls are less erroneous

to enforce I$/$O protection

Question $38(1\mathrm{.}25$ points$)$

Device controller Present uniform device$-$access interface to I$/$O subsystem.

Question $38$ options:

True

False

Question $39(1\mathrm{.}25$ points$)$

Linux, Windows, Android has its own I$/$O subsystem structures and device driver frameworks

Question $39$ options:

True

False

Question $40(1\mathrm{.}25$ points$)$

$\_\_\_\_\_\_$ is achieved by giving programs, users, and systems just enough privileges to perform their tasks only.

Question $40$ options:

Need to know principle

Least privilege principle

Role$-$base access control

Rule$-$base access control

Question $41(1\mathrm{.}25$ points$)$

It is impossible to have a $100\%$ secure system

Question $41$ options:

True

False

Question $42(1\mathrm{.}25$ points$)$

The goal of OS protection is

Question $42$ options:

Ensure that each object is accessed correctly and only by the allowed processes

Ensure that each object has a name

Ensure that each object is related to specific hardware and$/$or software

Ensure that each object has a secure address

Question $43(1\mathrm{.}25$ points$)$

Application$-$layer attack is measured in bit per second

Question $43$ options:

True

False

Question $44(1\mathrm{.}25$ points$)$

Which Access Matrix implementation is more suitable for process protection

Question $44$ options:

Global table

Access lists

Lock$-$key

Capability list

Question $45(1\mathrm{.}25$ points$)$

Where does the File$-$system resides on$?$

Question $45$ options:

I$/$O

Cach

Memory

Disk

Question $46(1\mathrm{.}25$ points$)$

Disk must be subdivided into partitions

Question $46$ options:

True

False

Question $47(1\mathrm{.}25$ points$)$

OS assigns an address to every I$/$O device

Question $47$ options:

True

False

Question $48(1\mathrm{.}25$ points$)$

Memory oversubscription in virtualization is best defined as when the subscribed resources exceed those allocated which requires extra management efficiency from VMM

Question $48$ options:

True

False

Question $49(1\mathrm{.}25$ points$)$

Which of the following are considered valid file operations $($select all that apply$)$:

Question $49$ options:

Create

Truncate

Delete

Reposition

Question $50(1\mathrm{.}25$ points$)$

A massive amount of bogus traffic hit a web server is called $\_\_\_\_\_\_\_\_$

Question $50$ options:

volume$-$based DDoS attack

network$-$layer DDos attack

Phishing attack

application$-$layer DDoS attack

Question $51(1\mathrm{.}25$ points$)$

A system where the user is not aware of the multiplicity of the machine is best described as $\_\_\_\_\_$

Question $51$ options:

A virtual system Type$2$ hypervisor

A Distributed$-$operating system

A Network$-$operating system

A Multicore bases system

Question $52(1\mathrm{.}25$ points$)$

OS tracks open files via $\_\_\_\_\_\_.$

Question $52$ options:

OS kernel

file pointer

open$-$file table

file$-$open count

Question $53(1\mathrm{.}25$ points$)$

A $\_\_\_\_\_\_\_\_$ is a collection of nodes containing information about all files

Question $53$ options:

partition

directory

metadata

file tree

Question $54(1\mathrm{.}25$ points$)$

Which of the following examples represent a domain switching $($select all that apply$)$

Question $54$ options:

When one user logs out and another user logs in $($aka user change$)$

When a CPU switches from one process to another

When a procedure call is made

When memory swap occurs

Question $55(1\mathrm{.}25$ points$)$

$\_\_\_\_\_\_$hardware device used to bypasses CPU to transfer data directly between I$/$O device and memory

Question $55$ options:

Device controller

Programmed I$/$O

Interrupt driven I$/$O

DMA controller

Question $56(1\mathrm{.}25$ points$)$

The most common method to access a file is$\_\_\_$

Question $56$ options:

direct access

access control list $($ACL$)$

sequential access

read$-$only access

Question $57(1\mathrm{.}25$ points$)$

A relative pathname in a tree directory structure begins at the root and follows a path down to the specified file, giving the directory names on the path.

Question $57$ options:

True

False

Question $58(1\mathrm{.}25$ points$)$

$\_\_\_\_\_\_\_\_$ is a collection of loosely coupled processors interconnected by a communications network

Question $58$ options:

Distributed system

Multicore processor

Remote method invocation

Application Programmable interface

Question $59(1\mathrm{.}25$ points$)$

Intercept an already$-$established session between a client and a server is called $\_\_\_\_\_\_$

Question $59$ options:

reply attack

session hijacking

man$-$in$-$the middle attack

brute force attack

answer $36-60$ correctly only send me options