What is a physical data model？Why learn physical data model concepts？
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
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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.、laaS B.PaaS C.SaaS D.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 layer B.data link layer C.application layer D.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 ERD B.ideal object model and analysis class model C.use case models and interface prototypes D.physical DFDs and database schema
