OPERATING SYSTEMS FOR PROGRAMMERS (31-60)

Question 1

Which solution resolves slow access time to user memory location when implementing paging?

Accepted Answer

Using the translation look-aside buffer (TLB)

Answer

Using swap

Answer

Using segmentation

Answer

Using the page-table base register (PTBR)

Question 2

Which component ensures the integrity of memory in a paged environment?

Accepted Answer

Protection bits

Answer

Page-table length register (PTLR)

Answer

Address-space identifiers (ASID)

Answer

Hit ratio

Question 3

What is a non-self-modifying code that never changes during execution?

Accepted Answer

Reentrant

Answer

Public

Answer

Private

Answer

Reserved

Question 4

What is the purpose of an inverted page table?

Accepted Answer

It reduces memory usage to store addresses.

Answer

It reduces the need for a reentrant code.

Answer

It reduces look-up time needed to search page tables.

Answer

It reduces the need for smaller page tables.

Question 5

What is a benefit of using virtual memory?

Accepted Answer

System libraries can be shared.

Answer

Implementation requires fewer resources.

Answer

System debugging is simplified.

Answer

Disk thrashing is eliminated.

Question 6

Which algorithm has the lowest possible page-fault rate and does not suffer from Belady's anomaly?

Accepted Answer

Optimal

Answer

Least Recently Used (LRU)

Answer

Counting-base

Answer

First in, first out (FIFO)

Question 7

Which collection of pages references the most recent set of delta parameters (Δ)?

Accepted Answer

The working set

Answer

The register set

Answer

The locality model

Answer

The page fault

Question 8

In Windows, what represents the shared-memory object that will enable communication between processes?

Accepted Answer

A memory-mapped file

Answer

A hashed page table

Answer

The dynamic link library

Answer

A memory frame object

Question 9

Which strategy for assigning kernel memory uses cache to refer to a set of one or more physically contiguous pages that serve for each unique kernel?

Accepted Answer

Slab allocation

Answer

Swap-space segmentation

Answer

Memory-mapped

Answer

Buddy system

Question 10

What is a scheme used to help free up space (i.e. garbage collection)?

Accepted Answer

Least frequently used (LFU)

Answer

First in, first out (FIFO)

Answer

Batch scheduling

Answer

Multi-level queue scheduling

Question 11

What will collect free space (i.e., garbage collection) together to provide more usable space?

Accepted Answer

Compaction

Answer

Segmentation

Answer

Modularity

Answer

Process management

Question 12

What is the smallest unit of data transfer in a physical hard disk drive?

Accepted Answer

Block

Answer

Sector

Answer

Track

Answer

Cylinder

Question 13

How is the array of logical blocks mapped onto the hard disk?

Accepted Answer

Onto the sectors of the disk sequentially

Answer

Onto the cylinders of the disk sequentially

Answer

Onto the cache memory of the disk

Answer

Onto the platter of the disk by block size

Question 14

What is the average latency of a typical hard disk?

Accepted Answer

3 milliseconds

Answer

.05 milliseconds

Answer

5 milliseconds

Answer

8 milliseconds

Question 15

What is the rate at which data flows from the hard disk to the computer?

Accepted Answer

Transfer

Answer

Latency

Answer

Seek

Answer

Arrival

Question 16

What is a benefit of creating a separate raw partition for use as swap space?

Accepted Answer

It is optimized for speed of access.

Answer

It requires less frequent access than file systems.

Answer

It can dynamically resize itself to meet system demands.

Answer

It reduces internal fragmentation.

Question 17

What is a stored data condition that can prevent other processes from gaining access to it?

Accepted Answer

File locking

Answer

Page locking

Answer

File sharing

Answer

Shared lock

Answer

File channel

Question 18

Which access type is used when speed is important in linked allocation files?

Accepted Answer

Sequential access

Answer

Direct access

Answer

Random access

Answer

Client access

Question 19

How do code editors and code compilers usually access files?

Accepted Answer

Sequential access

Answer

Random access

Answer

Relative access

Answer

Direct access

Question 20

What are two key types of access permissions?

Choose 2 answers

Accepted Answer

Append

Accepted Answer

List

Answer

Remove

Answer

Update

Answer

Create

Question 21

Which mounting model allows a computer to mount file systems from remote machines?

Accepted Answer

Client-server

Answer

Local

Answer

Loopback

Answer

Sharing

Question 22

What is the I/O bus standard that connects the processor-memory subsystem to the fast devices?

Accepted Answer

PCI

Answer

USB

Answer

SCSI

Answer

Expansion

Answer

FireWire

Answer

Fiber connection

Question 23

What is memory-mapped I/O?

Accepted Answer

Memory addresses reserved for device registers

Answer

Memory set aside for hard disks

Answer

Memory addresses developed for multi-user modes

Answer

Memory set aside for hardware manufacturers

Question 24

Which protection goal is achieved by detecting latent errors at the interfaces between components subsystems?

Accepted Answer

Improving reliability

Answer

Authorizing usage

Answer

Guarding resources

Answer

Enforcing policies

Question 25

How can protection improve the reliability of a system?

Accepted Answer

By detecting errors at the interfaces between component subsystems

Answer

By enabling users to configure a process affinity

Answer

By abstracting the underlying hardware from the user space

Answer

By preventing an unprivileged user to disable the antivirus

Question 26

What is an example of a policy?

Accepted Answer

User access

Answer

Physical key

Answer

Magnetic card reader

Answer

Mechanical door lock

Answer

Security bit

Question 27

How do policies and mechanisms differ?

Accepted Answer

Policies may change from place to place whereas mechanisms remain the same.

Answer

Policies dictate how something will be done whereas mechanisms dictate what should be done.

Answer

Polices decide where something will occur whereas mechanisms decide when something will occur.

Answer

Policies remain the same whereas mechanisms may change from time to time.

Question 28

What can be assigned roles when using role-based access control?

Choose 2 answers

Accepted Answer

The program

Accepted Answer

The process

Answer

The memory

Answer

The scheduler

Answer

The CPU

Answer

The system bus

Question 29

Several major retail chains are hacked and customer information is stolen, including credit card numbers.

Which type of attack has occurred?

Accepted Answer

Breach of confidentiality

Answer

Interruption of availability

Answer

Denial of service

Answer

Theft of service

Answer

Social engineering

Answer

Compromised integrity

Question 30

Which security level is identified by gathering information through malicious phone calls?

Accepted Answer

Human

Answer

Operating system

Answer

Physical

Answer

Network

OPERATING SYSTEMS FOR PROGRAMMERS (31-60)

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