Question $20/1\mathrm{.}25$ points

If there are more timer requests than the available number of timer hardware channels, the OS resolves this problem by$\_\_\_\_\_\_\_$

Question options:

simulating virtual clocks

enabling busy wait

enabling priority level.

using interrupt & polling mechanisms

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Question $30/1\mathrm{.}25$ points

You are designing a network routing solution and your client really cares about the messages to arrive in order what would be your routing options $($select all that apply$)$

Question options:

Virtual routing

Fixed routing

Remote routing

Circuit switching

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Question $50/1\mathrm{.}25$ points

In a distributed system, a client has a resource that a remote server is trying to access

Question options:

True

False

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Question $100/1\mathrm{.}25$ points

Operating systems must provide mandatory and advisory file$-$locking mechanisms

Question options:

True

False

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Question $120/1\mathrm{.}25$ points

Protocol$-$layer DDoS attack is measured in packet per seconds $($PPS$)$

Question options:

True

False

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Question $150/1\mathrm{.}25$ points

When the file is a fixed length of logical records, it allows programs to read and write records rapidly in no particular order.

Question options:

True

False

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Question $170/1\mathrm{.}25$ points

Access $($o$,$ d$,$ read$)$ means

Question options:

Domain o has read access to object d

Object o has read access to domain d

Domain d has read access to object o

Object d has read access on domain o

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Question $220/1\mathrm{.}25$ points

Alice would like to have a very simple directory structure, what would be your recommendation to her?

Question options:

use raw disk structure

use simple$-$tree directory structure

use Unix directory structure

use single$-$level directory structure

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Question $230/1\mathrm{.}25$ points

OS determines the type of operations performed on a file by using

Question options:

file extension

file path

file lock

file format

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Question $260/1\mathrm{.}25$ points

Which Access Matrix implementation is more suitable for user's protection

Question options:

Global table

Access lists

Lock$-$key

Capability list

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Question $310/1\mathrm{.}25$ points

A potential security violation is called $\_\_\_\_\_\_\_$

Question options:

an attack

a threat

a breach

a reconnaissance

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Question $370/1\mathrm{.}25$ points

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

Question options:

system calls are faster

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

system calls are less erroneous

to enforce I$/$O protection

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Question $380/1\mathrm{.}25$ points

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

Question options:

True

False

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Question $460/1\mathrm{.}25$ points

Disk must be subdivided into partitions

Question options:

True

False

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Question $470/1\mathrm{.}25$ points

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

Question options:

True

False

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Question $510/1\mathrm{.}25$ points

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

Question options:

A virtual system Type$2$ hypervisor

A Distributed$-$operating system

A Network$-$operating system

A Multicore bases system

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Question $530/1\mathrm{.}25$ points

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

Question options:

partition

directory

metadata

file tree

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Question $540/1\mathrm{.}25$ points

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

Question 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

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Question $570/1\mathrm{.}25$ 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 options:

True

False

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Question $630/1\mathrm{.}25$ points

A guest VCPU using binary translation can run instructions natively if it is in$\_\_\_\_\_\_$

Question options: