Test: Data Communication and Networking - 1 - SSC CGL MCQ

The primary function of a communication system is to facilitate the exchange of information between different devices within a network. This system comprises both hardware and software components that enable the transmission and reception of data. By establishing a connection between devices, a communication system ensures seamless sharing of information, promoting effective interaction and data transfer among networked devices.

Data integrity in data communication refers to the accuracy and reliability of data during transmission. It ensures that the data sent from one device to another remains unchanged and consistent throughout the communication process. Various mechanisms such as error detection and correction techniques are employed to maintain data integrity, guaranteeing that the information received is identical to the information sent.

Data is typically transferred in data communication in the form of signals from one location to another. These signals encode the data being transmitted and are sent across a transmission medium to the receiving device. By converting data into signals, information can be efficiently transmitted over networks, enabling effective communication between devices. This process plays a crucial role in ensuring the successful exchange of data in various communication systems.

In digital signal transmission, data is transmitted electronically as binary digits, typically represented as 0s and 1s. This method allows for more efficient and accurate data transmission compared to analog signals. Binary digit transmission forms the backbone of modern digital communication systems, enabling the representation of complex information through sequences of 0s and 1s.

The protocol is the component responsible for ensuring that data is delivered from the source to the correct destination in the right order. Protocols establish the rules and procedures for communication between devices, ensuring that data is transmitted reliably and efficiently. They play a crucial role in maintaining the integrity and accuracy of data during transmission.

Communication media serves as the pathway through which messages travel from the source to the destination. Whether wired or wireless, the communication medium facilitates the transmission of data between devices. It acts as the physical link that enables the exchange of information, playing a vital role in establishing connections and facilitating communication in networks.

A simplex channel is a communication channel where data flows in only one direction without the ability to support a response in the other direction. An example of a simplex channel is a radio broadcast where the transmitter sends information, and the receiver can only receive it. This type of communication is uni-directional and does not allow for two-way communication.

A half duplex channel is a communication channel where data can flow in both directions, but not at the same time. When one device is transmitting information, the other device can only receive it, and vice versa. An example of a half duplex channel is a walkie-talkie, where users take turns speaking and listening.

A full duplex channel is a communication channel where data flows in both directions simultaneously, enabling both stations to transmit and receive information at the same time. An example of a full duplex channel is a mobile phone, where users can talk and listen at the same time, allowing for real-time two-way communication.

Ethernet Cable, also known as Twisted Pair Cable, is commonly used in local area networks. The wires in an Ethernet Cable are twisted together and insulated, with an outer jacket for protection. This design helps reduce electromagnetic interference, making it an effective choice for transmitting data signals within a local network.

Radiowave Transmission involves communication using radio frequencies that range from 3Hz to 1GHz. These waves are omni-directional and can travel long distances, especially those that propagate in the sky mode. Radiowave transmission is commonly utilized in various communication systems due to its ability to cover expansive areas efficiently.

Fiber Optic Cable is made of glass or plastic and transmits signals as light from one end to another. Unlike other types of cables, fiber optic cables are unaffected by electromagnetic fields, allowing for reliable transmission over long distances at higher bandwidths. The use of light signals in fiber optics enables faster data transmission compared to traditional copper cables.

ARPANET, developed by Vint Cerf in 1969, was the first network of computers that paved the way for what we now know as the internet. It was a groundbreaking development in the history of computer networks, enabling researchers to share information and resources across different locations.

A switch in a computer network primarily functions to connect multiple computers within a LAN. Unlike hubs, switches forward data packets to specific recipients by establishing temporary connections between the source and destination, thus reducing overall network traffic.

A modem is a device that converts digital signals to analog signals at the sender's end and vice versa at the receiver's end, enabling communication over telephone lines. This conversion process allows data to be transmitted over analog mediums such as telephone lines, facilitating communication between devices over a network.