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Saturday, September 28, 2013

20 QUE IN CN

1. What is a network?
 
It is a set of devices connected by communication links. A node can be a computer or any other device capable of sending and/or receiving data generated by other nodes on the network.

2. What is a protocol?
 
It is a set of rules that governs data communication.

3. What is multiplexing?
 
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.

4. Define bandwidth?
 
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.

5. What do you mean by switching?
 
It is a method in which communication devices are connected to one another efficiently. A switch is intermediary hardware or software that links devices together temporarily.

6. What are the important topologies for networks?
 
BUS topology
STAR topology
RING topology
MESS topology

7. What are the duties of data link layer?
 
Data link layer is responsible for carrying packets from one hop (computer or router) to the next. The duties of data link layer include packetizing, adderssing, error control, flow control, medium access control.

8. What is virtual channel?
 
Virtual channel is normally a connection from one source to one destination, although multicast connections are also permitted. The other name for virtual channel is virtual circuit.

9. What is multicast routing?
 
Sending a message to a group is called multicasting, and its routing algorithm is called multicast routing.

10. What is TELNET ?
 
TELNET is a client - server application that allows a user to log on to a remote machine,giving the user access to the remote system. TELNET is an abbreviation of terminal network.

11. What do you mean by data communication?
 
It is the exchange of data between two devices via some form of transmission medium such as wire cable. The communicating system must be part of a communication system made up of a combination of hardware and software.The effectiveness of a data communication system depends on three fundamental characteristics: delivery, accuracy and timeliness.

12. What is distributed processing?
 
It is a strategy in which services provided by the network reside at multiple sites.

13. What is point to point connection?
 
It provides a dedicated link between two devices. The entire capacity of the link is reserved for transmission between the two devices.

14. What is Redundancy?
 
The concept of including extra information in the transmission solely for the purpose of comparison. This technique is called redundancy.

15. What is subnet?
 
A generic term for section of a large networks usually separated by a bridge or router.

16. What is multipoint connection?
 
In multipoint connection more than two specific devices share a single link. Here the capacity of the channel is shared either separately or temporally.

17. What is simplex?
 
It is the mode of communication between two devices in which flow of data is unidirectional.

18. What is half-duplex?
 
It is the mode of communication between two devices in which flow of data is bidirectional but not at the same time. ie each station can transmit and receive but not at the same time.

19. What is full duplex?
 
It is the mode of communication between two devices in which flow of data is bidirectional and it occurs simultaneously. Here signals going in either direction share the capacity of the link.

20. What is a topology?
 
Topology of a network is defined as the geometric representation of the relationship of all the links and linking devices (node) to one another .

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