1. Define data communication.
It is the exchange of data between two devices via some form of Transmission medium ( such as copper cable,twisted pair cable etc).
2. What are the elements of data communication?
The elements of data communication are
- Transmission medium
3. How we can check the effectiveness of data communication?
The effectiveness of data communication can be checked by
4. What are the classes of transmission media?
The classes of transmission media are
- Guided transmission media
- Unguided transmission media
5. Define Optical fiber
It is a method of transmitting information from one place to another by sending light through an optical fiber.
6. Define distributed processing
A task is divided among multiple computers. Instead of single large machine handling all the process, each separate computer handles the subset
7. What do you mean by OSI?
Open system interconnection model is a model for understanding and designing a network architecture. It is not a protocol.
8. Define Network.
A network is a set of devices connected by physical media links. A network is recursively is a connection of two or more nodes by a physical link or two or more networks connected by one or more nodes
9. What is a Link?
At the lowest level, a network can consist of two or more computers directly connected by some physical medium such as coaxial cable or optical fiber. Such a physical medium is called as Link.
10 What is point-point link?
If the physical links are limited to a pair of nodes it is said to be point-point link.
11. What is Multiple Access?
If the physical links are shared by more than two nodes, it is said to be Multiple Access.
12. Define Switch
Switches are hardware or software devices capable of creating temporary Connections between two or more devices
13. What are the types of switching?
The types of switching are
- Circuit switching
- Packet switching
- Message switching
14. What do you mean by Crossbar switches?
It connects m inputs to n outputs in a grid using electronic micro switches at each cross points.
15. Define Blocking
The reduction in the number of cross points result in a phenomenon called Blocking
16. Define packet switching
In packet switching data are transmitted in discrete units of potentially variable length blocks called Packets
17. What are the approaches of packet switching?
The approaches of packet switching are
- Virtual circuit
18. What do you mean by Permanent Virtual circuit?
The same Virtual circuit is provided between two users on a continuous basis. The circuit is dedicated to the specific user
19. What do you mean by DSL?
It is a new technology that uses the existing telecommunication network to accomplish high speed delivery of data, voice & video etc.
20. What is the purpose of Physical layer?
The physical layer coordinates the functions required to transmit a bit stream over a physical medium.