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Data Communication and Network - Internet & Networking, Computer Awareness | Famous Books for UPSC Exam (Summary & Tests) PDF Download

Data Communication and Network

Data communications refers to the transmission of digital data between two or more computers and a computer network. The physical connection between networked computing devices is established using either cable media or wireless media. The best-known computer network is the Internet.

The transmission of data is carried out by the propagation and processing of signals. The different types of transmission are,

  • Parallel Data Transmission – The sender sends all the bits at once on all lines. Because data lines are equal to the number of bits in a group or data frame. Advantage of Parallel transmission is speed and disadvantage is the cost of wires, as it is equal to the number of bits needs to send parallelly.

  • Serial Data Transmission –  Bits are sent one after another in a queue manner. It is slower than the Parallel Data Transmission.

  • Synchronous Data Transmission – Data-bits have specific pattern and helps receiver
    recognize when the actual data bits start and where it ends

Computer Network and it’s Types

The different types of Computer Networks are,

  • Personal Area Network

  • Local Area Network

  • Metropolitan Area Network

  • Wide Area Network

  • Storage Area Network

  • System Area Network

  • Controller Area Network

Personal Area Network (PAN)

PAN is the smallest network which is very personal. PAN network has a connectivity range of 10 meters. Bluetooth devices and Infra-Red devices are the common PAN devices. Bluetooth enabled Keyboard or Mouse, TV remote, wireless printers are some examples of PAN network.

Local Area Network (LAN)

LAN is a computer network spanned inside a building and operated under single administrative system. Each computer is connected by cables. LAN provides a useful way of sharing resources between end users. LANs are capable of transmitting data at very fast rates, much faster than data can be transmitted over a telephone line; but the distances are limited. Resources like Printers, File Servers, Scanners and internet is easy sharable among computers.

Metropolitan Area Network (MAN)

A network spanning a physical area larger than a LAN but smaller than a WAN, such as a city. A MAN is typically owned an operated by a single entity such as a government body or large corporation.  MANs provide Internet connectivity for LANs in a metropolitan region, and connect them to WANs like the Internet.

Wide Area Network (WAN)

A computer network that spans a relatively large geographical area. Typically, a WAN consists of two or more local-area networks (LANs). Generally, telecommunication networks are Wide Area Network. These networks provides connectivity to MANs and LANs. Equipped with very high speed backbone, WAN uses very expensive network equipment.They can also be connected through leased lines or satellites. The largest WAN in existence is the Internet.

Storage Area Network (SAN)

A Storage area network is a high-speed network of storage devices that also connects those storage devices with servers. SAN storage devices can include tape libraries, and, more commonly, disk-based devices.

System Area Network

System Area Network links high-performance computers with high-speed connections in a cluster configuration. Also known as Cluster Area Network.

Controller Area Network

Controller Area Network is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer.

Communication

Communication is carried out by means of

  • Modem –  a device that enables a computer to transmit data over telephone lines.

  • Optical Fiber – permit transmission over longer distances and at higher bandwidths.

  • Satellites – data can be transferred from one part of the world to any part of the world.

  • Twisted pair wire – used for telephone lines

  • Coaxial cable – a type of cable that is used by cable TV and that is common for data communications

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FAQs on Data Communication and Network - Internet & Networking, Computer Awareness - Famous Books for UPSC Exam (Summary & Tests)

1. What is data communication and networking?
Ans. Data communication and networking refers to the process of exchanging data between two or more devices through a network. It involves the transmission and reception of digital or analog signals, allowing devices to communicate and share information.
2. What is the Internet and how does it work?
Ans. The Internet is a global network of interconnected computers and devices that use standardized protocols to facilitate data transmission and exchange. It works by routing data packets between different networks using the Internet Protocol (IP), allowing users to access information, communicate, and share resources.
3. What are the different types of networks?
Ans. There are several types of networks, including: 1. Local Area Network (LAN): A LAN is a network that covers a small geographical area, such as an office, building, or campus. It allows devices to share resources and communicate with each other. 2. Wide Area Network (WAN): A WAN is a network that covers a large geographical area, such as multiple offices or cities. It connects multiple LANs and enables long-distance communication. 3. Metropolitan Area Network (MAN): A MAN is a network that covers a metropolitan area, such as a city. It provides high-speed connectivity for organizations and institutions within the area. 4. Wireless Network: A wireless network uses wireless communication technology, such as Wi-Fi or Bluetooth, to connect devices without the need for physical cables. 5. Virtual Private Network (VPN): A VPN is a secure network that allows users to access a private network over a public network, such as the Internet. It provides privacy and encryption for data transmission.
4. What is computer awareness in the context of networking?
Ans. Computer awareness in the context of networking refers to the understanding and knowledge of computer systems, hardware, software, and their interaction with networks. It includes knowing the basics of computer architecture, operating systems, network protocols, security measures, and troubleshooting techniques.
5. Why is computer awareness important in the field of data communication and networking?
Ans. Computer awareness is crucial in data communication and networking as it allows individuals to effectively utilize and manage network resources. It helps in troubleshooting network issues, implementing security measures, optimizing network performance, and understanding the impact of computer systems on network operations. Moreover, computer awareness facilitates effective communication and collaboration with network administrators and technicians.
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