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SSC CGL GENERAL SCIENCE: COMPUTER NETWORK & TYPES (LECTURE 1)

SSC CGL GENERAL SCIENCE: COMPUTER NETWORK & TYPES (LECTURE 1)

Dear students, computer knowledge is a must in today’s world. There is a separate section of the computer knowledge in all competitive examinations like banking, railway, SSC-CGL and other Government Jobs examinations. These examinations are mostly for graduates and they expect some standard knowledge of computer and not those limited to definitions of program, instruction & output devices. Questions are asked from topics like networking, database, operating system, memory device etc. You don’t need to go in depth or need to cover the syllabus of B.Tech (CSE) to crack these examinations. In this article, we will cover the most important topic for these competitive examinations i.e. Computer Network & Networking Layers. We can assure, after going through this you will be able to answer any question within a fraction of seconds.

This is also very beneficial for B.Tech graduates for placement point of view because recruiters always test the basic concepts of the candidate. You will not find anywhere on the internet explained simpler than this.

                                                     network1

COMPUTER NETWORK

Connections or arrangements of two or more computers for transfers of data.

Also Read,
IMPORTANT ABBREVIATIONS FOR COMPETITIVE EXAMINATIONS

DATA TRANSFER MODES

  • Simplex- Transfer in one direction (Radio)
  • Half Duplex- Transfer in both direction but not simultaneously (Talkback radio)
  • Full Duplex- Simultaneous transfer in both direction (Mobile & Telephone)

network2

ELEMENTS OF COMPUTER NETWORK

  • Data Source– From where data is originated
  • Sender (or transmitter)– Convert data to signals
  • Receiver– Convert received signals to data
  • Destination– Where data has to be received
  • Node– Device with independent communication ability & unique network address
  • Protocol– Rules & Conventions from communication method between network devices
  • Transmission system– Transmitted the signals (after data being converted into signals)

 

CASTING
Methods of message delivery

network5

TYPES OF CASTING

  • Unicast- One device sends message to another device (network address)
  • Broadcast- One device sends message to ALL other devices
  • Multicast- One device sends message to CERTAIN GROUP of devices on network

 Also Read,
NETWORK SECURITY AND HACKING

TYPES OF COMPUTER NETWORK

network4

  • Local Area Network (LAN) – connects network devices over a relatively short distance
  • Wide Area Network (WAN) – geographically dispersed collection of LANs
  • Metropolitan Area Network (MAN) – data network designed or spread over a town or city.
  • Storage Area Network (SAN)
  • System Area Network (SAN)
  • Server Area Network (SAN)
  • Small Area Network (SAN)
  • Personal Area Network (PAN)
  • Desk Area Network (DAN)
  • Controller Area Network (CAN)
  • Cluster Area Network (CAN)

 

TYPES OF WAN

  • Public Networks
  • Public Switched Telephone Networks (PSTN)
  • Public Service Digital Network (PSDN)

 

INTEGRATED SERVICES DIGITAL NETWORK (ISDN)
Combine both circuit & packet switching

 

PRIVATE NETWORK
Provides services at various locations using private or leased circuits

 

Students, please learn them before exams. We will be covering another important topic in next article. Stay Updated with Kailasha Foundation. You can also tell us if you want us to cover any specific topics or subjects.

SOURCE: Based on Self-Knowledge
IMAGE SOURCE: Google 

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