Quiz
Os test 1
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Perguntas do quiz (200)
1There is an increasingly prominent trend in many organizations to move a substantial
portion or even all IT operations to an Internet-connected infrastructure known as
enterprise cloud computing.- AVerdadeiro
- BFalso
2Cloud computing gives you the ability to expand and reduce resources according to
your specific service requirement.- AVerdadeiro
- BFalso
3With PaaS the customer has access to the resources of the underlying cloud infrastructure.
- AVerdadeiro
- BFalso
4With PaaS the customer has access to the resources of the underlying cloud infrastructure.
- AVerdadeiro
- BFalso
5With a hybrid cloud solution, sensitive information can be placed in a private area of the
cloud, and less sensitive data can take advantage of the benefits of the public cloud.- AVerdadeiro
- BFalso
6The NIST cloud computing reference architecture focuses on the requirements of “how to”
design cloud solutions and implementations.- AVerdadeiro
- BFalso
7The cloud OS is the software that implements IaaS.
- AVerdadeiro
- BFalso
8The virtual storage component of the cloud OS provides data storage services for the cloud
infrastructure.- AVerdadeiro
- BFalso
9With file-based storage systems, data are stored on hard disk as fixed-size blocks.
- AVerdadeiro
- BFalso
10Nova is the management software that controls virtual machines within the IaaS cloud
computing platform.- AVerdadeiro
- BFalso
11The main elements of a RFID system are tags and readers.
- AVerdadeiro
- BFalso
12The hardware abstraction layer (HAL) is the same for each hardware platform.
- AVerdadeiro
- BFalso
13One notable feature of RIOT is that it uses a tickless scheduler.
- AVerdadeiro
- BFalso
14Network connectivity is essential for data collection, development of distributed IoT
applications, and remote system maintenance.- AVerdadeiro
- BFalso
15The term constrained device is used to refer to the vast majority of IoT devices.
- AVerdadeiro
- BFalso
16_________ is a model for enabling ubiquitous, convenient, on-demand network access to a shared
pool of configurable computing resources.- AIaaS
- BService aggregation
- CResource Pooling
- DCloud computing
17_________ provides service to customers in the form of software, specifically application software,
running on and accessible in the cloud.- AIaaS
- BSaaS
- CRaaS
- DPaaS
18A _________ cloud infrastructure is made available to the general public or a large industry group,
and is owned by an organization selling cloud services.- Adata
- Bpublic
- Cprivate
- Dtraditional
19__________ clouds are a way to leverage existing infrastructure and deliver and chargeback for
bundled or complete services from the privacy of the organization’s network.- ACommunity
- BPublic
- CHybrid
- DPrivate
20The _________ cloud infrastructure is a composition of two or more clouds that remain unique
entities but are bound together by standardized or proprietary technology that enables data and
application portability.- AThe _________ cloud infrastructure is a composition of two or more clouds that remain unique
entities but are bound together by standardized or proprietary technology that enables data and
application portability. - Btraditional
- Ccommunity
- Dhybrid
- AThe _________ cloud infrastructure is a composition of two or more clouds that remain unique
21The _________ is a networking facility that provides connectivity and transport of cloud services
between cloud consumers and CSPs.- Acloud service provider
- Bcloud carrier
- Ccloud auditor
- Dcloud broker
229) A __________ is a dedicated network that provides access to various types of storage devices
including tape libraries, optical jukeboxes, and disk arrays.- ACSP
- BDAS
- CSAN
- DNAS
23The __________ of the cloud OS provides networking services for the cloud infrastructure.
- Avirtual network component
- Brouting process
- Cinfrastructure addressing scheme
- Dbandwidth allocation process
24 _________ is the protocol you most commonly use when using a Web browser.
- ANFS
- BHTTP
- CCIFS
- DSMB
25________ storage uses a flat address space instead of the hierarchical, directory-based scheme.
- ABlock
- BFile-based
- CObject
- DNetwork Attached
26The _________ is software that presents a consistent API to the upper layers and maps upper-layer
operations onto a specific hardware platform.- AHAL
- BGPIO
- CSPI
- DI2C
27RFC 7228 (Terminology for Constrained-Node Networks) defines ________ classes of constrained
devices- Atwo
- Bthree
- Cfour
- Dfive
28Evaluation, formatting, expanding/decoding, distillation/reduction, and assessment are
examples of ________ computing operations.- AOpenStack
- Bcloud
- Cfog
- DRFID
29_________ cloud provides service to customers in the form of a platform on which the customer’s
applications can run.- APaaS
- BIaaS
- CSaaS
- DCaaS
30A __________ is an entity that manages the use, performance, and delivery of cloud services, and
negotiates relationships between CSPs and cloud consumers.- Acloud carrier
- Bcloud auditor
- Ccloud broker
- Dcloud provider
311) The two most significant developments in computing in recent years are cloud computing and
the [blank_start]__________[blank_end].- AInternet of Things (IoT)
32The essential characteristics of cloud computing include broad network access, rapid elasticity,
measured service, on-demand self-service, and [blank_start]__________[blank_end].- Aresource pooling
333) A [blank_start]__________[blank_end] cloud has restricted access like a private cloud and shared cloud resources among
a number of independent organizations like a public cloud.- Acommunity
344) A [blank_start]________[blank_end] is a party that can conduct independent assessment of cloud services, information
system operations, performance, and security of the cloud implementation.- Acloud auditor
355) A [blank_start]__________[blank_end] is a person or organization that maintains a business relationship with, and uses
service from, cloud providers.- Acloud service consumer (CSC)
36Storage comes in the following topologies: Direct Attached Storage, Storage Area Network, and [blank_start]________[blank_end].
- ANetwork Attached Storage (NAS)
37The most widely deployed protocol for large-scale virtualization environments is [blank_start]__________[blank_end].
- ANetwork File System (NFS)
38 [blank_start]_________[blank_end] is an open-source software project of the OpenStack Foundation that aims to produce
an open-source cloud operating system.- AOpenStack
399) The [blank_start]__________[blank_end] is a term that refers to the expanding interconnection of smart devices, ranging from
appliances to tiny sensors.- AInternet of Things (IoT)
4010) [blank_start]_________[blank_end] is an open-source OS designed specifically for constrained IoT devices
- ARIOT
4111) The main components of a typical IoT OS are: system and support libraries, device drivers and
logical file system, low-power network stack, kernel, and [blank_start]______________[blank_end].- Ahardware abstraction layer (HAL)
4212) [blank_start]________[blank_end] is a serial computer bus typically used for attaching lower-speed peripheral ICs to processors
and microcontrollers in short-distance, intra-board communication.- AInter-Integrated Circuit (I 2 C)
43In an IoT, a [blank_start]_________[blank_end] is a device with limited volatile and nonvolatile memory, limited processing
power, and a low-data-rate transceiver.- Aconstrained device
44 [blank_start]__________[blank_end] technology uses radio waves to identify items.
- ARadio-Frequency Identification (RFID)
4515) A [blank_start]_________[blank_end] measures some parameter of a physical, chemical, or biological entity and delivers
an electronic signal proportional to the observed characteristic, either in the form of an analog
voltage level or a digital signal.- Asensor
46A loosely coupled or distributed multiprocessor consists of a collection of relatively autonomous systems, with each processor having its own main memory and I/O channels.
- AVerdadeiro
- BFalso
47With independent parallelism there is an explicit synchronization among processes.
- AVerdadeiro
- BFalso
48A typical use of independent parallelism is in a time-sharing system.
- AVerdadeiro
- BFalso
49A disadvantage of static assignment is that one processor can be idle, with an empty queue, while another processor has a backlog.
- AVerdadeiro
- BFalso
50In most traditional multiprocessor systems processes are dedicated to processors.
- AVerdadeiro
- BFalso
51An application can be implemented as a set of threads, which cooperate and execute concurrently in the same address space.
- AVerdadeiro
- BFalso
52Because of the potential disadvantages, load sharing is not one of the commonly used schemes in current multiprocessors
- AVerdadeiro
- BFalso
53The operating system, and in particular the scheduler, is perhaps the most important
component of a real-time system- AVerdadeiro
- BFalso
54One useful measure of the ability of an operating system to function deterministically
is the maximum delay from the arrival of a high-priority device interrupt to when
servicing begins.- AVerdadeiro
- BFalso
55User control is generally much broader in an ordinary operating system than in a
real-time operating system.- AVerdadeiro
- BFalso
56Static table-driven scheduling is applicable to tasks that are periodic.
- AVerdadeiro
- BFalso
57One of the more promising methods of resolving multitask scheduling conflicts
for periodic tasks is rate monotonic scheduling- AVerdadeiro
- BFalso
58Real-time tasks are not handled any differently than non-real-time tasks in the
priority queues.- AVerdadeiro
- BFalso
59Linux provided a real-time scheduling capability coupled with a scheduler for
non-real-time processes that made use of the traditional UNIX scheduling algorithm.- AVerdadeiro
- BFalso
60In the real-time-priority class, all threads have a fixed priority that never changes and
all the active threads at a given priority level are in a round-robin queue.- AVerdadeiro
- BFalso
61The multiprocessor system which consists of a set of processors that share a common main
memory and are under the integrated control of an operating system is a _________ .- Atightly coupled multiprocessor
- Bcluster
- Cloosely coupled or distributed multiprocessor
- Dfunctionally specialized processor
62With coarse and __________ grained parallelism, there is synchronization among processes, but
at a very gross level.- Amedium
- Bfine
- Cindependent
- Dvery course
63An example of __________ is an I/O processor.
- Aloosely coupled or distributed multiprocessors
- Btightly coupled multiprocessors
- Ccluster multiprocessing
- Dfunctionally specialized processors
64A __________ is one that must meet its deadline, otherwise it will cause unacceptable damage
or a fatal error to the system.- Aperiodic task
- Bsoft real-time task
- Chard real-time task
- Daperiodic task
65Typically, there will need to be a rather high degree of coordination and interaction among
the threads of an application, leading to a __________ level of synchronization.- Aindependent grain
- Bmedium grain
- Ccourse grain
- Dfine grain
66The __________ approach is a set of related threads scheduled to run on a set of processors at
the same time, on a one-to-one basis.- Adynamic scheduling
- Bload sharing
- Cgang scheduling
- Ddedicated processor assignment
67A _________ has an associated deadline that is desirable but not mandatory
- Ahard real-time task
- Bperiodic task
- Csoft real-time task
- Daperiodic task
68With the __________ approach the number of threads in a process can be altered during the
course of execution.- Adynamic scheduling
- Bload sharing
- Cgang scheduling
- Ddedicated processor assignment
69 __________ perform static analysis of feasible schedules of dispatching with the result of the
analysis being a schedule that determines, at run time, when a task must begin execution.- AStatic priority-driven preemptive approaches
- BStatic table-driven approaches
- CDynamic planning-based approaches
- DDynamic best effort approaches
70 __________ is the time required to execute the task to completion.
- AProcessing time
- BPriority time
- CResource time
- DReady time
71The basic idea of _________ is that a lower-priority task inherits the priority of any higher-priority
task pending on a resource they share.- Apriority ceiling
- Bpriority inversion
- Cunbounded priority inversion
- Dpriority inheritance
72In the __________ approach, a priority is associated with each resource.
- Apriority ceiling
- Bunbounded priority inversion
- Cpriority inversion
- Dpriority inheritance
73Processes at _________ priority levels are guaranteed to be selected to run before any time-sharing
process but must defer to real-time processes.- Akernel
- Btime-shared
- Creal time
- Dload sharing
74 __________ is the lowest-priority process, intended for user applications other than real-time
applications.- AKernel
- BVariable priority
- CReal time
- DTime-shared
75The __________ class is intended for applications that will only consume processor time when
no other threads are ready to execute.- Aidle user
- Btime-sharing
- Cbottom-half kernel
- Dreal-time
76A good way of characterizing multiprocessors and placing them in context with other
architectures is to consider the synchronization [blank_start]__________[blank_end] , or frequency of synchronization,
between processes in a system.- Acommunication
77Linux uses [blank_start]_________[blank_end] , in which threads are moved from a queue for one processor to a queue
for another processor.- Amachine readable
78In a [blank_start]__________[blank_end] architecture, the kernel can execute on any processor, and each processor
does self-scheduling from the pool of available processes.- Adirect memory access (DMA)
79The [blank_start]_________[blank_end] approach is the opposite of the load-sharing approach and provides implicit
scheduling defined by the assignment of threads to processors.- Aefficiency
80 [blank_start]__________[blank_end] is useful for medium-grained to fine-grained parallel applications whose
performance severely degrades when any part of the application is not running while
other parts are ready to run.- Alogical I/O
81 [blank_start]__________[blank_end] computing is defined as that type of computing in which the correctness of the
system depends not only on the logical result of the computation but also on the time at
which the results are produced.- Afile system
82An [blank_start]_________[blank_end] has a deadline by which it must finish or start, or it may have a constraint on
both start and finish time.- Adirectory management
83An operating system is [blank_start]__________[blank_end] to the extent that it performs operations at fixed,
predetermined times or within predetermined time intervals.- Ashortest-service-time-first (SSTF)
84 [blank_start]_________[blank_end] is a characteristic that refers to the ability of a system to fail in such a way as
to preserve as much capability and data as possible.- Astream-oriented device
85No feasibility analysis is performed with [blank_start]__________[blank_end] approach, and the system tries to
meet all deadlines and aborts any started process whose deadline is missed.- Acircular buffer
86 [blank_start]__________[blank_end] is the time at which a task becomes ready for execution.
- Aaccess time
87For [blank_start]__________[blank_end] scheduling, the highest-priority task is the one with the shortest period,
the second highest-priority task is the one with the second shortest period, and so on.- Afirst-in-first-out (FIFO)
88 [blank_start]__________[blank_end] occurs when circumstances within the system force a higher-priority task to
wait for a lower-priority task.- Astripe
89Processes at [blank_start]_________[blank_end] priority levels are guaranteed to be selected to run before any kernel
or time-sharing process.- Acache memory
90A thread is considered to be [blank_start]_________[blank_end] if the ratio of its voluntary sleep time versus its runtime
is below a certain threshold.- AHardware RAID
91Linux is a multiuser OS based on UNIX
- AVerdadeiro
- BFalso
92Typically, more complex embedded systems do not include an OS
- AVerdadeiro
- BFalso
93An antilock braking system in a car is an example of an embedded system.
- AVerdadeiro
- BFalso
94General-purpose computer systems far outnumber embedded systems.
- AVerdadeiro
- BFalso
95A simple embedded system, with simple functionality, may be controlled
by a special-purpose program or set of programs with no other software.- AVerdadeiro
- BFalso
96Embedded software does not execute in response to external events.
- AVerdadeiro
- BFalso
97General-purpose operating systems typically permit any user process to
use interrupts directly.- AVerdadeiro
- BFalso
98The disadvantage of using a general-purpose OS is that it is not optimized
for real-time and embedded applications.- AVerdadeiro
- BFalso
99Android is an embedded OS based on a Linux kernel
- AVerdadeiro
- BFalso
100Has a slow and lightweight process or thread switch” is a typical characteristic
of a specialized embedded OS- AVerdadeiro
- BFalso
101The TinyOS system provides a more streamlined approach for an embedded
OS than one based on a commercial general-purpose OS.- AVerdadeiro
- BFalso
102To deal with timing constraints the kernel maintains a real-time clock.
- AVerdadeiro
- BFalso
103A key differentiator between desktop/server and embedded Linux distributions
is that desktop and server software is typically compiled on one platform but is
intended to be executed on another.- AVerdadeiro
- BFalso
104The TinyOS scheduler operates across all components.
- AVerdadeiro
- BFalso
105 Clinux is a popular open-source Linux kernel variation targeted at microcontrollers
and other very small embedded systems.- AVerdadeiro
- BFalso
106 __________ refers to the use of electronics and software within a product.
- ATinyOS
- BGeneral purpose computer
- CEmbedded system
- DDesktop system
107 _________ was developed primarily for use with networks of small wireless sensors
- AAPI
- BTinyOS
- CeCos
- DMQS
108The well-known ________ law continues to drive down the size of memory and processing logic elements.
- ADzack’s
- BBabbage’s
- CHopper’s
- DMoore’s
109Configurability, direct use of interrupts, I/O device flexibility, and real-time operation
are some of the unique characteristics and design requirements for __________- ATiny OS
- BeCos
- Cembedded operating systems
- DOS service routines
110Two examples of operating systems that have been designed from the ground up for
embedded applications are TinyOS and _________ .- AeCos
- BLinux
- CBSD
- DHAL
111 __________ are defined by the processor’s ability to execute complex operating systems, such as
Linux, Android, and Chrome.- AMicroprocessors
- BDedicated processors
- CEmbedded processors
- DApplication processors
112 _______ is a compressed, read-only file system that was designed for use on low memory or
limited storage size environments such as embedded Linux systems- Acramfs
- Bubifs
- Cyaffs2
- Dsquashfs
113 _________ in TinyOS may be tied either directly or indirectly to hardware events.
- ACommands
- BTasks
- CTimers
- DEvents
114 _________ is an advantage of using Linux as the basis for an embedded OS
- AVendor independence
- BVaried hardware support
- CLow cost
- DAll of the above
115 __________ is a C system library originally developed to support Clinux and it is generally
used in conjunction with Clinux- ATinyOS
- BArbiter
- CClibc
- DUbifs
116 __________ has become a popular approach to implementing wireless sensor
- AeCos
- BTinyOS
- CArbiter
- DEmbedded system
117Each _________ in a component is similar to a thread in an ordinary OS, with certain limitations
- Akernel
- Bcommand
- Cevent
- Dtask
118 The __________ interface allows the client to hold on to a resource until the client is
notified that someone else needs the resource.- AResource configure
- BResource requested
- CResource
- DResource-specific
119Once a client has access to a resource, it uses ___________ to exchange data and
control information with the resource- Aresource-specific interfaces
- BeCos
- Copen sources
- Dresource requests
120Operate with limited resources, adapt to hardware evolution, support a wide range of
applications, support a diverse set of platforms, and be robust are goals for __________ .- ATinyOs
- BeCos
- CDSRs
- DISRs
1211) An [blank_start]__________[blank_end] is any device that includes a computer chip, but that is not a general-purpose computer,
such as a laptop or desktop system- AEmbedded system
122The [blank_start]_________[blank_end] provides a more streamlined approach for an embedded OS than one based
on a commercial general-purpose OS, such as an embedded version of Linux.- A(eCos)
123An embedded software system built using TinyOS consists of a set of small modules,
called [blank_start]_________[blank_end] , each of which performs a simple task or set of tasks and which interface
with each other and with hardware in limited and well-defined ways.- Acomponents
124The default scheduler in TinyOS is a simple [blank_start]__________[blank_end] queue
- Afirst-in-first-out (FIFO)
125In TinyOS, [blank_start]__________[blank_end] are nonblocking requests
- Acommands
126The [blank_start]_________[blank_end] accepts requests for access and configuration from a client and enforces the
lock on the underlying resource.- AArbiter
127The [blank_start]________[blank_end] component mediates data exchange between the client and the underlying resource.
- Ashared resource
128Real-time operation, reactive operation, configurability, I/O device flexibility, and streamlined
protection mechanisms are characteristics and design requirements for [blank_start]__________[blank_end] systems.- Aembedded operating
129An existing commercial OS can be used for an embedded system by adding [blank_start]________[blank_end] capability,
streamlining operation, and adding necessary functionality.- Areal-time
130[blank_start]________[blank_end] is when the platform provider is not dependent on a particular vendor to provide needed
features and meet deadlines for deployment.- AVendor independence
131The [blank_start]_________[blank_end] is a simple, read-only file system that is designed to minimize size by
maximizing the efficient use of underlying storage.- Acramfs (Compressed RAM file system)
132Three abstractions for resources are used in TinyOS: dedicated, virtualized, and [blank_start]________[blank_end] .
- Ashared
133Interrupts and counters are examples of [blank_start]________[blank_end] abstractions
- Adedicated
134A clock or timer is an example of the [blank_start]_________[blank_end] abstraction.
- Avirtualized
135The shared resource configuration provides the following interfaces to a client: Resource,
Resource requested, [blank_start]________[blank_end] , and resource-specific interfaces.- AResource configure
136An OS associates a set of privileges with each process.
- AVerdadeiro
- BFalso
137The misfeasor is generally an outsider.
- AVerdadeiro
- BFalso
138The objective of the intruder is to gain access to a system or to increase
the range of privileges accessible on a system.- AVerdadeiro
- BFalso
139Worms and bot programs are self-contained programs that can be
scheduled and run by the operating system.- AVerdadeiro
- BFalso
140Intrusion detection systems are only designed to detect malicious
software behavior.- AVerdadeiro
- BFalso
141The owner of the object can generally perform any action on the
security descriptor- AVerdadeiro
- BFalso
142The Security ID identifies a user uniquely across all of the machines
on the network.- AVerdadeiro
- BFalso
143Manual analysis of logs is preferred, as it is more likely to identify
abnormal activity.- AVerdadeiro
- BFalso
144The needs and policy relating to backup and archive should be determined
during the final stages of implementation- AVerdadeiro
- BFalso
145Firewalls are traditionally configured to limit access by port or protocol,
from some or all external systems.- AVerdadeiro
- BFalso
146All users with access to a system will have the same access to all data
and resources on that system.- AVerdadeiro
- BFalso
147Host-based firewalls, IDS, and IPS software also may improve security
by limiting remote network access to services on the system.- AVerdadeiro
- BFalso
148You should stage and validate all patches on test systems before deploying
them in production.- AVerdadeiro
- BFalso
149The superuser is exempt from the usual file access control constraints
and has systemwide access- AVerdadeiro
- BFalso
150DAC is based on the roles that users assume in a system rather than
the user’s identity.- AVerdadeiro
- BFalso
151On a typical system the highest level or privilege is referred to as _________ .
- Aadministrator
- Bsupervisor
- Croot access
- Dall of the above
152A _________ is an individual who is not authorized to use the computer and who
penetrates a system’s access controls to exploit a legitimate user’s account.- Aclandestine user
- Bsuperuser
- Cmasquerader
- Dmisfeasor
153A __________ is an individual who seizes supervisory control of the system and
uses this control to evade auditing and access controls or to suppress audit collection- Amisfeasor
- Bclandestine user
- Csuperuser
- Dmasquerader
154A _________ is a legitimate user who accesses data, programs, or resources for which
such access is not authorized, or who is authorized for such access but misuses his or
her privileges.- Asuperuser
- Bmisfeasor
- Cmasquerader
- Dclandestine user
155The ________ determines which users and groups can access this object for which operations
- ADACL
- Bmisfeasor
- Cmasquerader
- Dclandestine user
156 ________ define the type and contents of a security descriptor.
- ASACLs
- BFlags
- COwners
- DDACLs
157________ is the identifier by which this user is known to the system for purposes of security.
- AACE
- BAccess token
- CSID
- DPassword scheme
158Effective _________ helps ensure that in the event of a system breach or failure, system
administrators can more quickly and accurately identify what happened and thus most
effectively focus their remediation and recovery efforts- Alogging
- Barchiving
- Csecurity
- Dpatching
159________ is the traditional method of implementing access control.
- AMAC
- BRAC
- CDAC
- DRBAC
160________ controls access based on comparing security labels with security clearances.
- ARBAC
- BMAC
- CDAC
- DRAC
161_________ defenses aim to harden programs to resist attacks
- ACoding
- BCompile-time
- CRuntime
- DProgramming
162A __________ is a dedicated computer that interfaces with computers outside a network
and has special security precautions built into it in order to protect sensitive files on
computers within the network.- Afirewall
- BACL
- Cmatrix
- Dguard
163_________ implements a security policy that specifies who or what may have access
to each specific system resource and the type of access that is permitted in each instance.- AGuard page
- BAccess control
- CFirewall
- DAll of the above
164Recognition by voice pattern, handwriting characteristics, and typing rhythm
are examples of ________ .- Acyclical biometrics
- Brecognition biometrics
- Cdynamic biometrics
- Dstatic biometrics
165Recognition by fingerprint, retina, and face are examples of ___________ .
- Astatic biometrics
- Bdynamic biometrics
- Crecognition biometrics
- Dcyclical biometrics
1661) With [blank_start]________[blank_end] a process has complete control of the system and can add or change programs and files, monitor other processes, send and receive network traffic, and alter privileges.
- Aroot access
1672) A key security issue in the design of any [blank_start]_________[blank_end] is to prevent, or at least detect, attempts by a user or a piece of malicious software from gaining unauthorized privileges on the system.
- Aoperating system
1683) System access threats fall into two general categories: intruders and [blank_start]________[blank_end]
- Amalicious software
1694) The three classes of intruders are: clandestine user, misfeasor, and [blank_start]________[blank_end]
- Amasquerader
1705) Intrusion detection systems can be classified as host-based or [blank_start]___________[blank_end]
- Anetwork-based
1716) [blank_start]_______[blank_end] is the process of retaining copies of data over extended periods of time in order to meet legal and operational requirements to access past data.
- AArchive
1727) [blank_start]_______[blank_end] is the process of making copies of data at regular intervals, allowing the recovery of lost or corrupted data over relatively short time periods.
- ABackup
1738) System security begins with the installation of the [blank_start]_________[blank_end] .
- Aoperating system
1749) [blank_start]_________[blank_end] controls access based on the roles that users have within the system and on rules stating what accesses are allowed to users in given roles.
- ARBAC (role-based access control)
17510) [blank_start]_________[blank_end] controls access based on the identity of the requestor and on access rules stating what requestors are or are not allowed to do.
- ADAC (discretionary access control)
17611) [blank_start]________[blank_end] defenses aim to detect and abort attacks in executing programs.
- ARuntime
17712) [blank_start]__________[blank_end] is a condition at an interface under which more input can be placed into a buffer or data-holding area than the capacity allocated, overwriting other information
- ABuffer overflow
17813) The design goals for a [blank_start]________[blank_end] are: acts as a choke point, enforces the local security policy, is secure against attacks.
- Afirewall
17914) Electronic keycards, smart cards, and physical keys are authenticators that are referred to as a [blank_start]__________[blank_end]
- Atoken
18015) An IDS comprises three logical components: sensors, user interface, and [blank_start]________[blank_end] .
- Aanalyzers
181In a multiprogramming system multiple processes exist concurrently in main memory.
- AVerdadeiro
- BFalso
182The key to multiprogramming is scheduling
- AVerdadeiro
- BFalso
183The medium-term scheduler is invoked whenever an event occurs that may lead to
the blocking of the current process or that may provide an opportunity to preempt a
currently running process in favor of another.- AVerdadeiro
- BFalso
184Scheduling affects the performance of the system because it determines which processes
will wait and which will progress.- AVerdadeiro
- BFalso
185The main objective of long-term scheduling is to allocate processor time in such a way
as to optimize one or more aspects of system behavior.- AVerdadeiro
- BFalso
186In most interactive operating systems adequate response time is the critical requirement
- AVerdadeiro
- BFalso
187One problem with a pure priority scheduling scheme is that lower-priority processes
may suffer starvation.- AVerdadeiro
- BFalso
188FCFS performs much better for short processes than long ones.
- AVerdadeiro
- BFalso
189Round robin is particularly effective in a general purpose time sharing system or
transaction processing system.- AVerdadeiro
- BFalso
190The objective of a fair-share scheduler is to monitor usage to give fewer resources
to users who have had more than their fair share, and more to those who have had
less than their fair share- AVerdadeiro
- BFalso
191The traditional UNIX scheduler employs multilevel feedback using round robin within
each of the priority queues- AVerdadeiro
- BFalso
192First-come-first-served (FCFS) is a simple scheduling policy that tends to favor I/O
bound processes over processor bound processes.- AVerdadeiro
- BFalso
193In the Highest Response Ration Next (HRRN) scheduling policy, longer jobs are favored
because they yield a larger ratio from the smaller denominator in the equation.- AVerdadeiro
- BFalso
194A disadvantage of simulation is that results for a given run only apply to that particular
collection of processes under that particular set of assumptions.- AVerdadeiro
- BFalso
195In fair share scheduling each user is assigned a weighting of some sort that defines that
user's share of system resources as a fraction of the total usage of those resources.- AVerdadeiro
- BFalso
196The decision as to which available process will be executed by the processor:
- Along-term scheduling
- BI/O scheduling
- Cmedium-term scheduling
- Dshort-term scheduling
197The _________ determines which process, among ready processes, is selected next for execution.
- Adecision mode
- Bselection function
- CTAT
- Dlong-term scheduler
198Which of the following scheduling policies allow the O/S to interrupt the currently running
process and move it to the Ready state?- AFIFO
- BFCFS
- Cnon-preemptive
- Dpreemptive
199The __________ specifies the instants in time at which the selection function is exercised.
- Adecision mode
- Bmedium-term scheduling
- Cready state
- DTAT
200The traditional UNIX scheduler divides processes into fixed bands of priority levels,
with the highest priority band being the _________ .- Auser process band
- Bswapper band
- Cfile manipulation band
- Dutilization band
Informações
- Descrição
- Quiz sobre Os test 1, criado por ALI Alherz em 14-12-2018.
- Autor
- ALI Alherz
- Idioma
- English
- Visualizações
- 7
- Avaliação
- Ainda sem avaliações Avalie este quiz