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What is physical data structure and logical data structure?
Physical data structure: This is the physical equipment involved in the network eg router, cabling etc). Logical data structure: This is how the information flows internally and externally (the transfer of information from one node to another on the network).
Which one is a physical data structure?
tables
What is physical dfd?
A Physical Data Flow Diagram is a diagram showing howparticular functions are performed within the data flow as opposed to a Logical DFD which only shows what functions are performed.
What is the Difference between physical DFD and logical DFD?
For a physical Data Flow Diagram you explore into the logical DFD. for example, if you have a data flow arrow declared as "customer information" now the physical DFD would include in that data flow arrow "customer information = customer_name + customer_address". something along these lines Physical DFD shows how various functions are performed and who does them but Logical DFD strips away all physical constraints but does not restrict physical happenings from taking place.
Which layers of the OSI model are involved in data encapsulation?
none
What is the lowest data model?
The lowest data model is the physical data model. It represents how data is stored on a specific type of hardware and helps optimize storage and retrieval. It is the closest to the physical implementation in a database system.
What is the data modeler?
Physical Data Model
Which two layers of the OSI model have the same functions as the TCP model network layer?
physical & data link layers
In which two layers of the osi model do NIC's belong?
NIC's can perform in the Data Link Layer of the OSI model. However, they can also perform services in the Physical Layer.(Network+ Guide to Networking Answer)Physical and Data Link layers
Define data models and list different types of data models?
A data model is a collection of concepts that can be used to describe the structure of a database and provides the necessary means to achieve this abstraction whereas structure of a database means the data types,relationships and constraints that should hold on the data. Data model are divided into three different groups they are 1)object based logical model 2)record based logical models 3)physical models Types: Entity-Relationship (E-R) Data Model Object-Oriented Data Model Physical Data Model functional data model
Which layer of the OSI model is primarily concerned with accessing the physical media and physical addressing?
Data Link
The what layer in the OSI model arranges data into packets whereas the what layer prepares data for physical transmission?
network data-link
Which two layers of the osi model have the same function as the TCPIP?
physical and data link
Cable modems operate at the physical and what other layers of the OSI Model?
Answer: Data Link
Which two layers of the osi model have the same functions as the tcp model network access layer?
Physical Data Link
What layer of the OSI model routes data different lLANs and WANs based on network addresses?
Physical Layer of OSI model
What is the difference between data model and schema in database?
As I understand it, a database schema is a physical entity, it describes the structure of exactly how the data is stored and is itself stored by DBMS for reference. Data model, on the other hand, is an abstract representation of database.
