What is the main difference between "portability" & "Platform independent"?
Portability focuses on adaptation of software in various OS, by recompiling the source to make the binary compatible with the target OS and not necessarily modifying the source. If the source code strictly follows POSIX standard less likely one end up modifying it.
Platform independence focuses on ability of software to run on VIRTUAL hardware that inturn interfaces with the PHYSICAL hardware. Examples of cross-platform or platform independent languages are Python, JavaScript, Java etc.
Hope it helps. Let me know.
What is the difference between collision domain and broad cast domain?
A collision domain is a logical area in a computer network where data packets can "collide" with one another, in particular in the Ethernet networking protocol. The more collisions in a network the less efficient it is.
A broadcast domain is a logical area in a computer network where any computer connected to the computer network can directly transmit to any other in the domain without having to go through a routing device.
What is data modelling?
Designing a normalized schema is known as data modeling
Data Modelling is designing of the data content and structure of the database.
The data model documents the structure of and interrelationships between the data - it is presented as a combination of simple diagrams and written definitions and is independent of any DBMS software or hardware considerations.
Designing a de- normalized schema is known as dimension modeling
What is virtual Memory under Linux?
Linux supports virtual memory, that is, using a disk as an extension of RAM so that the effective size of usable memory grows correspondingly. The kernel will write the contents of a currently unused block of memory to the hard disk so that the memory can be used for another purpose. When the original contents are needed again, they are read back into memory. This is all made completely transparent to the user; programs running under Linux only see the larger amount of memory available and don't notice that parts of them reside on the disk from time to time. Of course, reading and writing the hard disk is slower (on the order of a thousand times slower) than using real memory, so the programs don't run as fast. The part of the hard disk that is used as virtual memory is called the swap space
Can we execute any simple program without installing any Operating system?
Why not? We can execute programes without operation system 'cause many machines like automatic washing machines, microwave and many other device do not have operating system but they execute program 'cause programs are implemented in there chip.
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