An operating system also has to be able to service peripheral（ ）,such as timers,motors,sensors,communicationdevices,disks,etc.All of those can request the attention of the OS（请作答此空）,i.e.at the time that they want to use the OS,theOS has to make sure it's ready to service the requests.Such a request for attention is called an interrupt.There are twokinds of interrupts:Hardware interrupts and Software interrupts.The result of an inteiTup:is also a triggering of theprocessor,so that it jumps to a（ ）address.Examples of cases where software interrupts appear are perhaps a divide by zero,a memory segmentation fault,etc.So this kind of interrupt is not caused by a hardware event but by a specificmachine language operation code.Many systems have more than one hardware interrupt line,and the hardwaremanufacturer typically assembles all these interrupt lines in an interrupt（ ）.An Interrupt（ ）is a piece of hardware that shields the OS from the electronic details of the interrupt lines,so that interrupts can be queued and none of themgets lost.A.synchronouslyB.asynchronouslyC.simultaneouslyD.directly
An operating system also has to be able to service peripheral（ ）,such as timers,motors,sensors,communicationdevices,disks,etc.All of those can request the attention of the OS（请作答此空）,i.e.at the time that they want to use the OS,theOS has to make sure it's ready to service the requests.Such a request for attention is called an interrupt.There are twokinds of interrupts:Hardware interrupts and Software interrupts.The result of an inteiTup:is also a triggering of theprocessor,so that it jumps to a（ ）address.Examples of cases where software interrupts appear are perhaps a divide by zero,a memory segmentation fault,etc.So this kind of interrupt is not caused by a hardware event but by a specificmachine language operation code.Many systems have more than one hardware interrupt line,and the hardwaremanufacturer typically assembles all these interrupt lines in an interrupt（ ）.An Interrupt（ ）is a piece of hardware that shields the OS from the electronic details of the interrupt lines,so that interrupts can be queued and none of themgets lost.
A.synchronously
B.asynchronously
C.simultaneously
D.directly
B.asynchronously
C.simultaneously
D.directly
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It is a kind of online service system, on which you can publish and exchange information with others who also are the members of the system.On which you can paste your articles and answer the questions asked by the members of the system and you can also look for help here.It isA．BBSB．WWWC．E-mailD．TELNET
In the fields of physical security and information security, access control is the selective restriction of access to a place or other resource. The act of accessing may mean consuming,entering, or using. Permission to access a resource is called authorization（授权）.An access control mechanism（ ）between a user （or a process executing on behalf of a user） and system resources, such as applications, operating systems, firewalls; routers, files,and databases. The system must first authenticate（验证）a user seeking access. Typically the authentication function determines whether the user is （ ） to access the system at all.Then the access control function determines if the specific requested access by this user is permitted. A security administrator maintains an authorization database that specifies what type of access to which resources is allowed for this user. The access control function consults this database to determine whether to（ ） access. An auditing function monitors and keeps a record of user accesses to system resources.In practice, a number of（请作答此空）may cooperatively share the access control function. All Operating systems have at least a rudimentary（基本的）.and in many cases a quite robust, access control component. Add-on security packages can add to the （ ）access control capabilities of the OS. Particular applications .or utilities, such as a database management system, also incorporate access control functions. External devices, such as firewalls, can also provide access control services .A.componentsB.usersC.mechanismsD.algorithms
An operating system also has to be able to service peripheral（ ）,such as timers,motors,sensors,communicationdevices,disks,etc.All of those can request the attention of the OS（ ）,i.e.at the time that they want to use the OS,theOS has to make sure it's ready to service the requests.Such a request for attention is called an interrupt.There are twokinds of interrupts:Hardware interrupts and Software interrupts.The result of an inteiTup:is also a triggering of theprocessor,so that it jumps to a（ ）address.Examples of cases where software interrupts appear are perhaps a divide by zero,a memory segmentation fault,etc.So this kind of interrupt is not caused by a hardware event but by a specificmachine language operation code.Many systems have more than one hardware interrupt line,and the hardwaremanufacturer typically assembles all these interrupt lines in an interrupt（请作答此空）.An Interrupt（ ）is a piece of hardware that shields the OS from the electronic details of the interrupt lines,so that interrupts can be queued and none of themgets lost.A.vectorB.arrayC.queueD.ist
A real-time operating system.（RTOS）is an operating system intended to serve（ ）application process data as it comes in,typically without buffering delays.A key（请作答此空）of a RTOS is the level of its consistency concerning the amount of time it takes to accept and complete an application’s task;the variability is jitter.A hard real-time operating system has（ ）jitter than a soft real-time operating system.The chief design goal is not high throughput,but rather a guarantee of a soft or hard performance category.A RTOS has an advanced algorithm for scheduling.（ ）flexibility enables a wider,computer-system orchestration of process priorities,but a real-time OS is more frequently dedicated to a narrow set of applications.Key factors in a real-time OS are minimal（ ）latency and minimal thread switching latency.A.characteristicB.programmingC.structureD.computer
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CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （ ） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（请作答此空） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.propagationB.transmissionC.collidingD.listening
CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （请作答此空） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（ ） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.convenient B.inconvenientC.usableD.unusable
Management information systems form a bedrock ofIT use in the public sector.They are therefore found in all sections ofthe public sector and in all countries..Of course，different people use the term"management information system"differently:The term should therefore not form the basis for arguments about__（请作答此空）__an MIS is and is not.So long as one and those with whom one works understand and agree on a definition，that is good enough.Similarly，when dealing with written material，one needs to be able to__（ ）__and communicate，not get locked into doctrinal debate，Many public service providers have developed management information systems to morutor and control the services that they provide.Both the US__（ ）__UK Social Security agencies have developed MIS to report on the welfare payments and services that they provide.The British public healthcare system has also been a major investor in MIS as it 1ries to control healthcare costs and simultaneously improve delivery standards.Individual schools can also__（ ）__use ofMIS.Hobmoor Junior and Infant School，a public school in Birmingham，UK，introduced a computerised attendance system to produce MIS reports that monitor pupil attendance.This improved the Principal’s ability to understand and control absence patterns，resulting in a 2.5 per cent__（ ）__in attendance rates.A.whatB.thatC.whichD.this
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System analysis is traditionally done top-down using structured analysis based on（ ）. Object-oriented analysis focuses on creation of models. The three types of theanalysis model are（ ）. There are two substages of object-oriented analysis.（ ） focuses on real-world things whose semantics the application captures. The object constructedin the requirement analysis shows the（ ）of the real-world system and organizes it intoworkable pieces.（请作答此空）addresses the computer aspects of the application that are visible tousers. The objects are those which can be expected to vary from time to time quite rapidly. A. Program analysisB. Function requirementC. Application analysisD. Physical model
System analysis is traditionally done top-down using structured analysis based on（ ）. Object-oriented analysis focuses on creation of models. The three types of theanalysis model are（ ）. There are two substages of object-oriented analysis.（ ） focuses on real-world things whose semantics the application captures. The object constructedin the requirement analysis shows the（请作答此空）of the real-world system and organizes it intoworkable pieces.（ ）addresses the computer aspects of the application that are visible tousers. The objects are those which can be expected to vary from time to time quite rapidly. A. static structureB. system componentsC. data flowsD. program procedures
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The database instance has the following parameter setting： OS_AUTHENT_PREFIX = OPS$ OS_ROLES = FALSE REMOTE_OS_AUTHENT = FALSE REMOTE_OS_ROLES = FALSE TIMED_OS_STATISTICS = 0 You have a local operating system user SKD. You create a database user OPS$SKD， and then assignexternal authentication. The user OPS$SKD has the CREATE SESSION privilege. What would youachieve by the above process（）A、The database user OPS$SKD will be able to administer the database.B、The authentication detail for the database user OPS$SKD is recorded in the password file.C、The local operating system user SKD will be able to access the database instance without specifying the username and password.D、The database user OPS$SKD has to login with the password of the local operating system user SKD to access the database instance.
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单选题The database instance has the following parameter setting： OS_AUTHENT_PREFIX = OPS$ OS_ROLES = FALSE REMOTE_OS_AUTHENT = FALSE REMOTE_OS_ROLES = FALSE TIMED_OS_STATISTICS = 0 You have a local operating system user SKD. You create a database user OPS$SKD， and then assignexternal authentication. The user OPS$SKD has the CREATE SESSION privilege. What would youachieve by the above process（）AThe database user OPS$SKD will be able to administer the database.BThe authentication detail for the database user OPS$SKD is recorded in the password file.CThe local operating system user SKD will be able to access the database instance without specifying the username and password.DThe database user OPS$SKD has to login with the password of the local operating system user SKD to access the database instance.