Quiz
Os test 2
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Perguntas do quiz (160)
1This is a decision whether to add a new process to the set of processes that are currently active:
- Ashort-term scheduling
- Blong-term scheduling
- Cmedium-term scheduling
- DI/O scheduling
2A risk with _________ is the possibility of starvation for longer processes, as long as there is a
steady supply of shorter processes.- ASRT
- BSPN
- CFIFO
- DFCFS
3The decision as to which process' pending I/O request shall be handled by an available I/O device
- Along-term scheduling
- Bshort-term scheduling
- CI/O scheduling
- Dmedium-term scheduling
4In the case of the __________ policy, the scheduler always chooses the process that has the shortest
expected remaining processing time- ASRT
- BFCFS
- CSPN
- DHRRN
5This is a decision whether to add a process to those that are at least partially in main memory
and therefore available for execution:- Along-term scheduling
- BI/O scheduling
- Cshort-term scheduling
- Dmedium-term scheduling
6Response time in an interactive system is an example of:
- Auser-oriented criteria for long-term scheduling policies
- Bsystem-oriented criteria for short-term scheduling policies
- Csystem-oriented criteria for long-term scheduling policies
- Duser-oriented criteria for short-term scheduling policies
7 __________ considers the execution history of a related group of processes along with the
individual execution history of each process in making scheduling decisions.- ATAT
- BHRRN
- CFSS
- DFCFS
8 The operating system must make _________ types of scheduling decisions with respect to
the execution of processes.- Asix
- Bfour
- Cfive
- Dthree
9Typically, the swapping-in function for processes is based on the need to manage _______
- Athe degree of multiprogramming
- BI/O requirements
- Cprocess priorities
- Dvirtual memory
10The strategy that schedules processes based on their group affiliation is generally
referred to as _________ .- Ashortest process next
- Bfair share scheduling
- Cqueuing analysis
- Dsimulation modeling
11The aim of [blank_start]__________[blank_end] is to assign processes to be executed by the processor or processors
over time, in a way that meets system objectives, such as response time, throughput, and
processor efficiency- Aprocessor scheduling
12The [blank_start]_________[blank_end] scheduler determines which programs are admitted to the system for processing.
- Along-term
13 [blank_start]_________[blank_end] is the elapsed time between the submission of a request until the response begins
to appear as output.- AResponse time
14The simplest scheduling policy is [blank_start]__________[blank_end] .
- Afirst-come-first-served (FCFS)
15 [blank_start]__________[blank_end] scheduling is part of the swapping function.
- AMedium-term
16In terms of the queuing model, [blank_start]__________[blank_end] is the total time that the item spends in the system
(waiting time plus service time).- Aturnaround time (TAT)
17Giving each process a slice of time before being preempted is a technique known as [blank_start]________[blank_end]
- Atime slicing
18A common technique for predicting a future value on the basis of a time series of past
values is [blank_start]__________[blank_end] .- Aexponential averaging
19The [blank_start]__________[blank_end] scheduler executes most frequently and makes the fine-grained decision
of which process to execute next.- Ashort-term
20The [blank_start]__________[blank_end] approach means that the operating system allocates the processor to a
process and when the process blocks or is preempted, feeds it back into one of several
priority queues- Amultilevel feedback
21The need to know or estimate required processing times for each process, the starvation
of longer processes, and the lack of preemption are all difficulties with the [blank_start]__________[blank_end]
scheduling technique- AShortest Process Next (SPN)
22Response time and throughput are examples of [blank_start]__________[blank_end] criteria for short term scheduling.
- Aperformance-related
23 [blank_start]_________[blank_end] is a scheduling policy in which the process with the shortest expected processing
time is selected next, and if a shorter process becomes ready in the system, the currently
running process is preempted- AShortest remaining time (SRT)
24The traditional UNIX scheduler, such as those used in SVR3 and 4.3 BSD UNIX systems,
divides processes into fixed [blank_start]__________[blank_end] of priority levels.- Abands
25A scheduling mechanism that requires no prior knowledge of process length, yet can nevertheless
favor shorter jobs, is known as the [blank_start]__________[blank_end] scheduling mechanism.- Afeedback
26Virtualization technology enables a single PC or server to simultaneously
run multiple operating systems or multiple sessions of a single OS.- AVerdadeiro
- BFalso
27VMM allows multiple VMs to safely coexist on a single physical server
host and share that host’s resources.- AVerdadeiro
- BFalso
28The hyperfile sits between the hardware and the VMs and acts as a
resource broker.- AVerdadeiro
- BFalso
29There are currently more virtual servers deployed in the world than
physical servers- AVerdadeiro
- BFalso
30A key aspect of server virtualization is that VMs cannot be viewed as
network resources.- AVerdadeiro
- BFalso
31Virtual Machine technologies are also used in desktop environments to
run multiple operating systems.- AVerdadeiro
- BFalso
32A virtual server sees all of the resources of the physical host
- AVerdadeiro
- BFalso
33Once the virtual machine is created it can be powered on like a physical
server and utilized in the manner of a physical server.- AVerdadeiro
- BFalso
34Virtual machines are made up of files
- AVerdadeiro
- BFalso
35Type-2 hypervisors are considered to be more secure than the
Type-1 hypervisors- AVerdadeiro
- BFalso
36Adding additional vCPUs in a VM is a difficult and time-consuming
process.- AVerdadeiro
- BFalso
37Protection rings describe level of access or privilege inside of a
computer system.- AVerdadeiro
- BFalso
38The process of reclaiming older pages that are not being used is done
through ballooning.- AVerdadeiro
- BFalso
39 The disadvantage to a directly connected I/O device is that the virtual
machine is tied to the physical server it is running on.- AVerdadeiro
- BFalso
40Virtual machines are hosted via the infrastructure services in the VMkernel
- AVerdadeiro
- BFalso
41The solution that enables virtualization is a __________ .
- Around robin
- Bvirtual machine monitor
- Chyperfile
- DDalviB600
42The number of guests that can exist on a single host is measured as a ________ .
- AVMM ratio
- Bhypervisor ratio
- Cconsolidation ratio
- Dbroker ratio
43The concept of a hypervisor is the most common basis for classifying __________ approaches.
- Avirtual machine
- Bconsolidation
- Cratio
- Dround robin
44The ________ facilitates the translation and I/O from the virtual machine to the physical server devices.
- Ahardware
- Bmemory
- Chypervisor
- Dnetwork interface card
45There are _______ types of hypervisors, distinguished by whether there is another operating system between the hypervisor and the host.
- Atwo
- Bthree
- Cfour
- Dfive
46 A ________ hypervisor has much better performance characteristics than the Type-2 hypervisor.
- AType-1
- BType-3
- CType-4
- DType-5
47User applications run in ______ which is the least trusted area.
- ARing 0
- BRing 1
- CRing 2
- DRing 3
48Hypervisors run in ________ controlling hardware access for the virtual machines they host
- ARing 0
- BRing 1
- CRing 2
- DRing 3
49_______ is a commercially available hypervisor from VMware that provides users a bare metal hypervisor to host virtual machines on their servers.
- AZygote
- BDalvi06B
- CJVM
- DESXi
5010) ________ permits the relocation of the data files that compose a virtual machine while that virtual machine is in use.
- ADRS
- BStorage VMotion
- CFault Tolerance
- DStorage and Network I/O Control
51________ can power-off and on physical hosts as they are needed.
- AStorage and Network I/O Control
- BDRS
- CDPM
- DResource Scheduler
52________ uses various replication technologies to copy selected virtual machines to a secondary site in the case of a data center disaster.
- ASite Recovery Manager
- BDPM
- CFault Tolerance
- DStorage VMotion
5313) The __________ is the core of the hypervisor and performs all the virtualization functions
- AVMkernel
- Bcontainer
- CJVM
- Dchbind utility
54________ promise of “Write Once, Run Anywhere” provides an agile and simple deployment model, allowing applications to be developed independent of the execution platform
- ALinux’s
- BJava’s
- CDocker’s
- DVserver’s
55The concept of _________, as used in Linux, refers to a partitioning of the privileges available to a root user.
- Aroot isolation
- Bhosting platform
- Ccapabilities
- Dprocess isolation
561) A machine with [blank_start]_________[blank_end] software can host numerous applications, including those that run on different operating systems, on a single platform.
- Avirtualization
57A VMM is commonly known today as a [blank_start]________[blank_end] .
- Ahypervisor
58The [blank_start]_________[blank_end] , or hypervisor, abstracts the physical hardware from the virtual machines it supports
- Avirtual machine monitor (VMM)
59A [blank_start]________[blank_end] is a software construct that mimics the characteristics of a physical server.
- AVirtual Machine (VM)
605) An operating system in a virtual machine accesses the resource that is presented to it by the Virtual Machine Monitor or [blank_start]_________[blank_end] .
- Ahypervisor
61VMware Workstation and Oracle VM Virtual Box are examples of [blank_start]________[blank_end] hypervisors.
- AType-2
627) [blank_start]________[blank_end] is a software-assisted virtualization technique that uses specialized APIs to link virtual machines with the hypervisor to optimize their performance.
- AParavirtualization
63When multiple VMs are contending for a processor, the [blank_start]________[blank_end] acts as the traffic controller, scheduling processor time for each VM’s request as well as directing the requests and data to and from the virtual machines.
- Ahypervisor
64The [blank_start]_________[blank_end] is the central router of information and controls access to all of the physical resources of the hardware.
- Aoperating system
65Ring [blank_start]_______[blank_end] is the most trusted layer and is where the operating system kernel works and can interact directly with hardware.
- A0
66Similar to data de-duplication, [blank_start]__________[blank_end] is a feature built into hypervisors that helps optimize memory usage.
- Apage sharing
67The capability to allocate more memory than physically exists on a host is called [blank_start]__________[blank_end] .
- Amemory overcommit
68[blank_start]________[blank_end] creates a lockstep copy of a virtual machine on different host so that if the original host suffers a failure, the virtual machine’s connections get shifted to the copy without interrupting users or the application they are using.
- AFault Tolerance
6914) The goal of a [blank_start]__________[blank_end] is to provide a runtime space for a set of Java code to run on any operating system staged on any hardware platform, without needing to make code changes to accommodate the different operating systems or hardware
- AJava Virtual Machine (JVM)
70The [blank_start]__________[blank_end] is described as being an abstract computing machine, consisting of an instruction set, a program counter register, a stack to hold variables and results, and a heap for runtime data and garbage collection, and a method area for code and constants.
- AJava Virtual Machine (JVM)
71All types of UNIX files are administered by the OS by means of inodes
- AVerdadeiro
- BFalso
72A preallocation policy requires that the maximum size of a file be declared
at the time of the file creation request- AVerdadeiro
- BFalso
73File systems do not maintain the attributes associated with the files.
- AVerdadeiro
- BFalso
74A field is characterized by its length and data type.
- AVerdadeiro
- BFalso
75The cluster is the fundamental unit of allocation in NTFS.
- AVerdadeiro
- BFalso
76Records may only be of fixed length.
- AVerdadeiro
- BFalso
77The superuser is exempt from the usual file access control constraints and
has system wide access.- AVerdadeiro
- BFalso
78Typically, the only way that a user or application may access files is through
the file management system.- AVerdadeiro
- BFalso
79Device drivers are not part of the operating system.
- AVerdadeiro
- BFalso
80The least-complicated form of file organization is the indexed file.
- AVerdadeiro
- BFalso
81The sequential file organization is the only one that is easily stored on
tape as well as disk.- AVerdadeiro
- BFalso
82A partial index contains one entry for every record in the main file.
- AVerdadeiro
- BFalso
83A file directory contains information about the files, including attributes,
location, and ownership.- AVerdadeiro
- BFalso
84Indexed allocation supports both sequential and direct access to the file and
thus is the most popular form of file allocation.- AVerdadeiro
- BFalso
85A file allocation table (FAT) is used to keep track of the portions assigned to a file.
- AVerdadeiro
- BFalso
86A _________ is the basic element of data.
- Adatabase
- Bfield
- Cfile
- Drecord
87A __________ is responsible for starting I/O operations on a device and processing the
completion of an I/O request.- Abasic I/O supervisor
- Bbasic file system
- Cdevice driver
- Dlogical I/O
88A _________ is a collection of related fields that can be treated as a unit by some
application program- Afile
- Bfield
- Crecord
- Ddatabase
89An objective of the __________ is to provide a standardized set of I/O interface routines
to user processes- Aworking directory
- Bfile management system
- Cindexed file allocation
- Dfile directory
90A __________ is a collection of similar records.
- Afile
- Bdatabase
- Crecord
- Dfield
91The __________ level is the primary interface with the environment outside of the
computer system- Alogical I/O
- Bbasic I/O supervisor
- Cphysical I/O
- Daccess method
92 _________ are used mostly in applications where timeliness of information is critical and
where data are rarely processed exhaustively.- AIndexed files
- BIndexed sequential files
- CSequential files
- DHashed files
93A _________ is a collection of related data
- Arecord
- Bfile
- Cdatabase
- Dfield
94The _________ is concerned with scheduling disk and tape accesses to optimize performance
- Adevice driver
- Bbasic I/O supervisor
- Caccess method
- Dlogical I/O
95The term _________ refers to the logical structuring of the records as determined by the
way in which they are accessed.- Afile organization
- Baccess method
- Cworking directory
- Ddatabase
96The most common form of file structure is __________ .
- Athe indexed file
- Bthe sequential file
- Cthe pile
- Dthe indexed sequential file
97The _________ file exploits the capability found on disks to access directly any block
of a known address.- Adirect
- Bsequential
- Cindexed sequential
- Dindexed
98 A _________ is a contiguous set of allocated blocks.
- Akey
- Bpathname
- Cpile
- Dportion
99The _________ contains the core parts of the operating system, including system binaries, system libraries,
and configuration files.- Adata directory
- Bsystem directory
- Ccache directory
- Dmnt/sdcard directory
100 __________ represents an open file associated with a process.
- ADentry object
- BInode object
- CFile object
- DSuperblock object
101A UNIX file system resides on a single logical disk or disk partition and is laid out with
the following elements: superblock, inode table, data blocks, and [blank_start]__________[blank_end] .- Aboot block
102The [blank_start]__________[blank_end] level provides a standard interface between applications and the file systems
and devices that hold the data.- Aaccess method
103In the [blank_start]__________[blank_end] form of file structure all records are of the same length, consisting of the
same number of fixed-length fields in a particular order.- Asequential file
104The essential aspects of a [blank_start]__________[blank_end] are that the relationships that exist among elements
of data are explicit and designed for use by a number of different applications.- Adatabase
105The physical organization of the file on secondary storage depends on the blocking
strategy and the [blank_start]__________[blank_end] strategy- Afile allocation
106 [blank_start]__________[blank_end] provides a general purpose record I/O capability and maintains basic data about files.
- ALogical I/O
107An [blank_start]_________[blank_end] is a control structure that contains the key information needed by the
operating system for a particular file.- Ainode
108An objective of the [blank_start]__________[blank_end] is to meet the data management needs and requirements of
the user, which include storage of data and the ability to perform related operations.- Afile management system
109The [blank_start]__________[blank_end] is responsible for all file I/O initiation and termination.
- Abasic I/O supervisor
110Because there is no structure to the [blank_start]_________[blank_end] form of file organization, record access is
by exhaustive search.- Apile
111 [blank_start]__________[blank_end] are often used where very rapid access is required, where fixed-length records
are used, and where records are always accessed one at a time.- ADirect files (or Hashed files)
112The [blank_start]________[blank_end] is a balanced tree structure with all branches of equal length, and has become
the standard method of organizing indexes for databases.- AB-tree
113Linux makes use of a [blank_start]__________[blank_end] , which presents a single, uniform file system
interface to user processes.- Avirtual file system (VFS)
114Three methods of file allocation commonly used are: chained, indexed and [blank_start]_________[blank_end] .
- Acontiguous
115A [blank_start]_________[blank_end] is a collection of addressable sectors in secondary memory that an OS or
application can use for data storage.- Avolume
116Examples of human readable external I/O devices are printers, terminals,
and keyboards.- AVerdadeiro
- BFalso
117The use to which a device is put does not have an influence on the software
and polices in the operating system and supporting utilities.- AVerdadeiro
- BFalso
118Direct memory access is the dominant form of transfer that must be supported
by the operating system- AVerdadeiro
- BFalso
119The hierarchical philosophy is that the functions of the operating system
should be separated according to their complexity, their characteristic time scale,
and their level of abstraction.- AVerdadeiro
- BFalso
120The actual queuing and scheduling of I/O operations occurs at the logical I/O module.
- AVerdadeiro
- BFalso
121Access rights are managed at the physical organization layer.
- AVerdadeiro
- BFalso
122Double buffering is when a process transfers data to (or from) one buffer while the
operating system empties (or fills) the other.- AVerdadeiro
- BFalso
123RAID 0 provides real-time backups of all data so that in the event of a disk failure,
all of the critical data is still immediately available- AVerdadeiro
- BFalso
124The SCAN policy favors jobs whose requests are for tracks nearest to both innermost
and outermost tracks, and favors the latest arriving jobs.- AVerdadeiro
- BFalso
125RAID is a set of physical disk drives viewed by the operating system as a single
logical drive.- AVerdadeiro
- BFalso
126Windows has no way to support the encryption of entire volumes.
- AVerdadeiro
- BFalso
127Cache memory reduces average memory access time by exploiting the principle
of locality.- AVerdadeiro
- BFalso
128A key aspect of I/O is the use of buffers that are controlled by I/O utilities rather
than by application processes.- AVerdadeiro
- BFalso
129Two of the most widely used approaches to improve disk I/O performance are
disk scheduling and disk cache.- AVerdadeiro
- BFalso
130In the C-SCAN disk scheduling algorithm, the disk arm is required to move in
one direction only until it reaches the last track or there are no more requests to
service in that direction, then it reverses direction and the scan proceeds in the
opposite direction in the same fashion.- AVerdadeiro
- BFalso
131The __________ category of external devices are suitable for communicating with the computer user.
- Aapplication
- Bmachine readable
- Ccommunication
- Dhuman readable
132The __________ unit is capable of mimicking the processor and of taking over control of the
system bus just like a processor.- Ainterrupt-driven I/O
- BI/O channel
- Cdirect memory access
- Dprogrammed I/O
133 __________ external devices are suitable for communicating with electronic equipment.
- ACommunication
- BApplication
- CMachine readable
- DHuman readable
134The requested operations and data are converted into appropriate sequences of I/O instructions,
channel commands, and controller orders at the __________ layer.- Adevice I/O
- Bscheduling and control
- Clogical I/O
- Dphysical organization
135 __________ external devices are suitable for communicating with modems
- AHuman readable
- BApplication
- CMachine readable
- DCommunication
136 __________ is a technique that smoothes out peaks in I/O demand
- ABuffering
- BBlocking
- CSmoothing
- DTracking
137The advantage of _________ is that it provides extremely high data availability.
- ARAID 2
- BRAID 4
- CRAID 0
- DRAID 6
138The _________ technique is used on a Windows server to optimize the use of threads.
- Apolling
- Basynchronous procedure call
- Csignaling an event object
- DI/O completion ports
139On a moveable-head system, the time it takes to position the head at the track is known as ________
- Aaccess time
- Bseek time
- Ctransfer time
- Drotational delay
140RAID level __________ is not a true member of the RAID family because it does not include redundancy to improve performance or provide data protection.
- A3
- B0
- C5
- D4
141The __________ technique allows multiple simultaneous I/O requests against a
single device or file.- Aasynchronous procedure call
- Bsignaling an event object
- Cpolling
- Dsignaling the file object
142 __________ are an efficient way of making consistent snapshots of volumes so that they
can be backed up.- APhoto copies
- BProcess copies
- CTransfer copies
- DShadow copies
143RAID 5 is organized in a similar fashion to _________ , but is different in the fact that
RAID 5 distributes the parity strips across all disks.- ARAID 3
- BRAID 2
- CRAID 1
- DRAID 4
144The disk scheduling algorithm that implements two sub-queues in a measure to avoid
the problem of "arm stickiness" is the __________ .- AC-SCAN policy
- BFSCAN policy
- CDMA
- DN-step-SCAN policy
145The simplest type of support that the operating system can provide is _________
- Aoverflow buffering
- Bdual buffering
- Csingle buffering
- Dcircular buffering
146External devices that engage in I/O with computer systems are grouped into three
categories: human readable, machine readable, and [blank_start]__________[blank_end] .- Acommunication
147Disk drives, USB keys, sensors, and controllers are examples of [blank_start]__________[blank_end] external I/O devices.
- Amachine readable
148A [blank_start]__________[blank_end] module controls the exchange of data between main memory and an I/O module
- Adirect memory access (DMA)
149Two objectives are paramount in designing the I/O facility: generality and [blank_start]__________[blank_end]
- Aefficiency
150The [blank_start]__________[blank_end] module deals with the device as a logical resource and is not concerned with
the details of actually controlling the device.- Alogical I/O
151The [blank_start]_________[blank_end] layer deals with the logical structure of files and with the operations that can
be specified by users, such as open, close, read, and write.- Afile system
152At the [blank_start]_________[blank_end] layer, symbolic file names are converted to identifiers that either reference
the file directly or indirectly through a file descriptor or index table.- Adirectory management
153The [blank_start]__________[blank_end] policy is to select the disk I/O request that requires the least movement of
the disk arm from its current position.- Ashortest-service-time-first (SSTF)
154A [blank_start]__________[blank_end] transfers data in and out as a stream of bytes, with no block structure.
- Astream-oriented device
155When more than two buffers are used, the collection of buffers is itself referred to as
a [blank_start]__________,[blank_end] with each individual buffer being one unit.- Acircular buffer
156The sum of the seek time and the rotational delay equals the [blank_start]__________[blank_end] , which is the
time it takes to get into position to read or write.- Aaccess time
157The simplest form of scheduling is [blank_start]___________[blank_end] scheduling, which processes items from
the queue in sequential order.- Afirst-in-first-out (FIFO)
158A set of logically consecutive strips that maps exactly one strip to each array member is
referred to as a [blank_start]__________[blank_end] .- Astripe
159The term [blank_start]_________[blank_end] is usually used to apply to a memory that is smaller and faster than
main memory, and that is interposed between main memory and the processor.- Acache memory
160Windows supports two sorts of RAID configurations: Software RAID and [blank_start]________[blank_end] .
- AHardware RAID
Informações
- Descrição
- Quiz sobre Os test 2, criado por ALI Alherz em 14-12-2018.
- Autor
- ALI Alherz
- Idioma
- English
- Visualizações
- 3
- Avaliação
- Ainda sem avaliações Avalie este quiz