what is the difference between logical and physical data flow diagram?
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What's the difference between a logical DFD and a physical DFD? A logical DFD focuses on the business and business activities, while a physical DFD looks at how a system is implemented. ... The logical DFD describes the business events that take place and the data required for each event.
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Physical and logical networks. A physical network connects two or more physical network interfaces. ... A logical network is a portion of a physical network that connects two or more logical network interfaces or devices. A logical network interface or device is the software entity that is known by an operating system.
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2 Answers. Physical schema represents the actual connection to the data source or data target. ... One logical schema can be associated with multiple physical schema along with context, i.e. one logical schema is associated with different physical schema using different context.
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A conceptual data model identifies the highest-level relationships between the different entities. ... A logical data model describes the data in as much detail as possible, without regard to how they will be physical implemented in the database.
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The conceptual model is to establish the entities, their attributes, and their relationships. The logical data model defines the structure of the data elements and set the relationships between them. The physical Data Model describes the database-specific implementation of the data model.
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The basic difference between Logical and physical address is that Logical address is generated by CPU in perspective of a program. On the other hand, the physical address is a location that exists in the memory unit. The set of all logical addresses generated by CPU for a program is called Logical Address Space.
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A logical network diagram usually shows network devices like routers, firewalls, and voice gateways. ... A physical network diagram shows how the network devices are physically connected together, and therefor all ports on all devices on the network are represented here. This will include cables.
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Is the logical design the design of the network based on current needs, growth issues and cost and the physical design of a network the actual network with cables routers switches, etc.? The Logical Design would be the IP structure of your network. ... The Physical design will be the topology you will be using.
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In the logical design, you look at the logical relationships among the objects. In the physical design, you look at the most effective way of storing and retrieving the objects. Your design should be oriented toward the needs of the end users.
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data flow, flow charts and data structures are covered under HLD. High Level Design gives the overall System Design in terms of Functional Architecture details and Database design. ... LLD -- Low Level Design (LLD) is like detailing the HLD. It defines the actual logic for each and every component of the system.
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Simply put, an ADT (Abstract Data Type) is more of a logical description, while a Data Structure is concrete. Think of an ADT as a picture of the data and the operations to manipulate and change it. A Data Structure is the the real, concrete thing.
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A logical DFD focuses on the business and business activities, while a physical DFD looks at how a system is implemented. ... The logical DFD describes the business events that take place and the data required for each event.
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A physical network connects two or more physical network interfaces. A logical network is a portion of a physical network that connects two or more logical network interfaces or devices. ... A logical network interface or device is the software entity that is known by an operating system.
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A physical topology describes how network devices are physically connected - in other words, how devices are actually plugged into each other. We're talking about cables, wireless connectivity, and more. A logical topology describes how network devices appear to be connected to each other.
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A logical topology is how devices appear connected to the user. A physical topology is how they are actually interconnected with wires and cables. ... However, its physical topology is a star, in which every node on the network connects to a central hub.
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Physical view refers to the way data are physically stored and processed in a database. On the other side, logical view is designed to suit the need of different users by representing data in a meaningful format. Another word, the logical view tells the users, in their term, what is in the database.
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There are three main models of data modeling like conceptual, logical, and physical. A conceptual model is used to establish the entities, attributes, and relationships. A logical data model is to define the structure of the data elements and set the relationship between them.