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computer network interview questions | Part2

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All computer network Interview Questions

11.Define internet?
Ans: It is a network of networks.

12.What is a protocol?
Ans: It is a set of rules that governs data communication. A protocol defines what is communicated, how it is communicated, and when it is communicated. The key elements of protocol are syntax, semantics and timing.

13.What is TCP/IP protocol model?
Ans: It is a five layered model which provides guidelines for the development of universally compatible networking protocols.
The five layers are physical, data link, network, transport and application.

14.Describe the functions of five layers?
Ans: Physical- It transmits raw bits over a medium. It provides mechanical and electrical specification.
Data link- It organizes bits into frames. It provides hop to hop delivery.
Network-It moves the packets from source to destination.It provide internetworking.
Transport-It provides reliable process to process message delivery and error recovery.
Application-It allows ti access to network resources.

15.What is ISO-OSI model?
Ans: Open Systems Interconnection or OSI model was designed by the International Organization for Standardization (ISO) .It is a seven layer model. It is a theoretical model designed to show how a protocol stack should be implemented.
It defines two extra layers in addition to TCP/IP model.
Session -It was designed to establish, maintain, and synchronize the interaction between communicating system.
Presentation-It was designed to handle the syntax and semantics of the information exchanged between the two systems. It was designed for data translation, encryption, decryption, and compression.

16. What is multiplexing?
Ans: Multiplexing is the process of dividing a link, the phycal medium, into logical channels for better efficiency. Here medium is not changed but it has several channels instead of one.

16.What is switching?
Ans: Switching in data communication is of three types
Circuit switching
Packet switching
Message switching

17.How data is transmitted over a medium?
Ans: Data is transmitted in the form of electromagnetic signals.

18. Compare analog and digital signals?
Ans: Analog signals can have an infinite number of values in a range but digital signal can have only a limited number of values.

19.Define bandwidth?
Ans: The range of frequencies that a medium can pass is called bandwidth. It is the difference between the highest and lowest frequencies that the medium can satisfactorily pass.

20.What are the factors on which data rate depends?
Ans: Data rate ie.how fast we can send data depends upon
i) Bandwidth available
ii) The levels of signals we can use
iii) The quality of the channel (level of noise)

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