问答题What is a physical data model？Why learn physical data model concepts？
问答题
What is a physical data model？Why learn physical data model concepts？
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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.（ ）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.functional decomposition B.object abstraction C.data inheritance D.information generalization A.function model，class model and state model B.class model，interaction model and state model C.class model，interaction model and sequence model D.function model，interaction model and state model A.Static analysis B.Semantic analysis C.Scope analysis D.Domain analysis A.static structure B.system components C.data flows D.program procedures A.Program analysis B.Function requirement C.Application analysis D.Physical model
The X.25 standard specifies three layers of functionality.Which layers of the OSI model correspond to the X.25 layers?A．the Physical, Network, and Session LayersB．the Physical, Data Link, and Network LayersC．the Physical, Data Link, and Transport LayersD．the Physical, Session, and Presentation layers
● System analysis is traditionally done top-down using structured analysis based on （71）. Object-oriented analysis focuses on creation of models. The three types of theanalysis model are （72）. There are two substages of object-oriented analysis. （73） focuses on real-world things whose semantics the application captures. The object constructedin the requirement analysis shows the （74） of the real-world system and organizes it intoworkable pieces.（75）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.（71）A. functional decompositionB. object abstractionC. data inheritanceD. information generalization（72）A. function model，class model and state modelB. class model，interaction model and state modelC. class model，interaction model and sequence modelD. function model，interaction model and state model（73）A. Static analysisB. Semantic analysisC. Scope analysisD. Domain analysis（74）A. static structureB. system componentsC. data flowsD. program procedures（75）A. Program analysisB. Function requirementC. Application analysisD. Physical model
You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation?A. ApplicationB. PresentationC. SessionD. TransportE. InternetF. Data LinkG. Physical
You have set up an Internet based FTP server, where people can upload and download files. In terms of the OSI model, what is the highest layer used during the FTP sessions.A. ApplicationB. PresentationC. SessionD. TransportE. InternetF. Data LinkG. Physical
Which layer in the OSI model is responsible for translating frames into bits?() A. Application LayerB. Presentation LayerC. Data Link LayerD. Physical Layer
The TCP/IP stack is a complete set of networking protocols. The OSI Model was meantto be a standardized way of connecting devices together. and most protocols have some directcorrelation to the OSI Model. The OSI Model has 7 layers. the foruth layer is called(75)A. physical layerB. data link IayerC.application layerD.transport layer
Which three of the following OSI model layers also belong to the TCP／IP model?() A. The application layerB. The session layerC. The data link layerD. The transport layerE. The network interface layerF. The physical layer
The TCP／IP network model differs from the more popular OSI model. Which of the layers below belong to the TCP／IP model?() A. application layerB. session layerC. transport layerD. internet layerE. network layerF. data link layerG. physical layer
Which layer of the OSI reference model uses flow control, sequencing, and acknowledgements to ensure that reliable networking occurs?() A. data linkB. networkC. transportD. presentationE. physical
Data transfer is slow between the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintained. To fix this issue, at which layer should the troubleshooting process begin?（）A. presentationB. sessionC. transportD. networkE. physical
cloud storage is a model of computer of computer data storage in which the digital data is stored in logical pools.The physical storage spans multiple servers（somentimes in multiple locations）,and the physical environment is typically owned and managed by a hosting company.As for the cloud concepet,the cloud storage service is one kind of（ ）.A.、laaSB.PaaSC.SaaSD.DaaS
The TCP/IP stack is a complete set of networking protocols.The OSI Model was meant to be a standardized way of connecting devices together,and most protocols have some direct correlation to the OSI Model.The OSI Model has 7 layers,the fourth layer is called______.A.physical layerB.data link layerC.application layerD.transport layer
An application architecture specifies the technologies to be used to implement one or more information systems. It serves as an outline for detailed design, construction, and implementation. Given the models and details, include （请作答此空）, we can distribute data and processes to create a general design of application architecture. The design will normally be constrained by architecture standards, project objectives, and （ ）. The first physical DFD to be drawn is the （ ）. The next step is to distribute data stores to different processors. Data（ ）are two types of distributed data which most RDBMSs support. There are many distribution options used in data distribution. In the case of （ ）, we should record each table as a data store on the physical DFD and connect each to the appropriate server.A.logical DFDs and ERDB.ideal object model and analysis class modelC.use case models and interface prototypesD.physical DFDs and database schema
（）is not a physical wall but a flow virtual data to protect the computer network.A、data wallB、data channelC、databaseD、firewall
（）is not a physical wall, but a lot of virtual data to protect the computer network. A、Data wallB、Data ChannelC、Data baseD、firewall
You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation?（）A、ApplicationB、PresentationC、SessionD、TransportE、InternetF、Data LinkG、Physical
Which three of the following OSI model layers also belong to the TCP/IP model?（）A、The application layerB、The session layerC、The data link layerD、The transport layerE、The network interface layerF、The physical layer
The TCP/IP network model differs from the more popular OSI model. Which of the layers below belong to the TCP/IP model?（）A、application layerB、session layerC、transport layerD、internet layerE、network layerF、data link layerG、physical layer
Which layer of the OSI reference model uses flow control, sequencing, and acknowledgements to ensure that reliable networking occurs?（）A、data linkB、networkC、transportD、presentationE、physical
What are five of the seven layers that are found in the OSI model?（）A、applicationB、protocolC、sessionD、transportE、physicalF、gatewayG、data link
Data transfer is slow between the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintaineD.To fix this issue, at which layer should the troubleshooting process begin?（）A、presentationB、sessionC、transportD、networkE、physical
Which layer in the OSI model is responsible for translating frames into bits?（）A、Application LayerB、Presentation LayerC、Data Link LayerD、Physical Layer
多选题Which three of the following OSI model layers also belong to the TCP/IP model?（）AThe application layerBThe session layerCThe data link layerDThe transport layerEThe network interface layerFThe physical layer
问答题Is relational DBMS physical data model suitable for spatial data？如果不适合，有哪两类解决途径？