Tamilnadu State Board New Syllabus Samacheer Kalvi 12th Computer Applications Guide Pdf Chapter 10 Introduction to Computer Networks Text Book Back Questions and Answers, Notes.

Tamilnadu Samacheer Kalvi 12th Computer Applications Solutions Chapter 10 Introduction to Computer Networks

12th Computer Applications Guide Introduction to Computer Networks Text Book Questions and Answers

Part I

Choose The Correct Answers

Question 1.
A set of computers connecting together is caiied as ……………..
a) Network
b) Server
c) Hub
d) Node
Answer:
a) Network

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 2.
Computer network devices that originates route and terminate the data were called as
a) Hub
b) Resource
c) Node
d) Cable
Answer:
c) Node

Question 3.
Match the period and methods available on the history of computer networking on the Internet
a) 1950 – X.25 TCP/IP
b) 1966 – SAGE
c) 1976 – WAN
d) 1972 – ARCNET

a) 4321
b) 3421
c) 1234
d) 2341
e) 4123
Answer:
e) 4123

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 4.
Western Electric introduced the first widely used……………… that implemented true
computer control.
a) Packet switch
b) Arpanet
c) Host
d) Telephone switch
Answer:
d) Telephone switch

Question 5.
Wi-Fi is short name for
a) Wireless Fidelity
b) Wired fidelity
c) Wired fiber optic
d) Wireless fiber optic
Answer:
a) Wireless Fidelity

Question 6.
People everywhere can express and publish their ideas and opinions via
a) Tele-medicine
b) blogging
c) Server
d) Node
Answer:
b) blogging

Question 7.
Which one of the following periods, the speed capacity supported towards gigabit on a computer network?
a) SABRE
b) SAGE
c) NEW FIBRE OPTICS
d) ARCNET
Answer:
c) NEW FIBRE OPTICS

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 8.
One among them was challenging to the business people on computer networking
a) Hacking
b) Viruses
c) Both a & b
d) none of this above
Answer:
c) Both a & b

Question 9.
……………. able to predict, manage, and protect the computer network at Internet
a) Artificial intelligence
b) Broadband provider
c) Cloud computing
d) Transceivers
Answer:
a) Artificial intelligence

Question 10.
……………….. use less power compared with single transmitter or satellite often cell towers nearer
a) Mobile devices
b) Transistors
c) WIFI
d) Communication
Answer:
a) Mobile devices

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 11.
People nowadays getting relaxed via
a) Business
b) Corporate company
c) Newspapers
d) Social media
Answer:
d) Social media

Question 12.
Which one of the following is not the social media
a) Gmail
b) Facebook
c) Twitter
d) Linkedin
Answer:
a) Gmail

Question 13.
Facebook was created at ………………………….year
a) 2002
b) 2004
c) 2013
d) 2010
Answer:
b) 2004

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 14.
In a mobile network, land areas for network coverage were distributed as
a) Firmware
b) cells
c) Range
d) Service
Answer:
b) cells

Question 15.
Which one was harmful to the computer
a) Bloggers
b) Browser
c) Hackers
d) Twitter
Answer:
c) Hackers

Question 16.
Which innovation made people use the Internet?
a) Social web
b) Mobile technology
c) Mobile App
d) Both a & b.
Answer:
d) Both a & b.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Part II

Short Answers

Question 1.
Define Computer Network.
Answer:

  1. A set of computers connected together for the purpose of sharing resources is called a computer networks.
  2. At present, the Internet is the most common resource shared everywhere.

Question 2.
Define Internet
Answer:
The Internet is a network of global connections – ‘ comprising private, public, business, academic and government networks – linked by guided, wireless and fiber-optic technologies.

Question 3.
What are the common uses of Computer Network?
Answer:
The common uses of computer network are

  1. Communication
  2. Resource sharing
  3. Data (or) software sharing
  4. Money-saving

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 4.
List out some feature of Mobile Network.
Answer:

  • Less consumption of power
  • Huge capacity than a large transmitter, at single frequency
  • Covering large area than a single transmitter

Question 5.
Difference between wired and wireless networks.
Answer:

Wired Network Wireless Network
A Wired network system connected with network cable. A Wireless network is connecting Devices without cables
Example: speakers, CCTV, printers, outdoors, and scanners, etc., with cables. Example: Tablets(tab), indoor cameras and E-readers, etc., without cables (WiFi).

Part III

Explain in brief answer

Question 1.
Define ARPANET.
Answer:
First In 1969, four nodes of ARPANET were connected between four universities namely the University of California at Los Angeles, at Santa Barbara, the Stanford Research Institute and the university of Utah using the 50 Kbit/s circuits.

Packet-switched networks was the theoretical work to model was performed by Leonard Kleinrock, ARPANET was which underpinned the development of it and his theoretical work on hierarchical routing in late 1970 s with his student Farouk Kamoun remains critical to the operation of the Internet today.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 2.
What is the use of cloud storage and cloud computing?
Answer:
Cloud storage

  • It is just storage of data on online, access in different area no geographical limits was in need.
  • Cloud storage provides users with immediate access to a broad range of resources.

Cloud computing:

  • It is the on demand availability of computer sys-tem resources.
  • Especially data storage and computing power, without direct active management by the user

Question 3.
What is mean by Artificial Intelligence?
Answer:

  1. Artificial intelligence able to be better predict traffic as it collects and analyzes data in real-time,
  2. some of the network managers were better prepared for big events such as the World cup, Olympics, Valentine’s Day, which often put on the Internet under pressure.
  3. Now the networks were monitored by an algorithm that enables for anomalous build-ups of traffic and activity which may be the result of nasty activities such as (DDoS) Distributed Denial-of-Service attacks and attempted hacks.
  4. This Artificial Network powering algorithms will become the most intelligent; it might find faster and reliable methods of anticipating threats and cleaning networks.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 4.
List out some usefulness of Social Network.
Answer:

  • Group information sharing over long distances.
  • Broadcast announcements,
  • Fostering diversity of thought.

Question 5.
How Computer Networks save money saving?
Answer:
Money-saving:
Using computer networking, it’s an important financial aspect for the organization because it saves money. It reduces the paperwork, manpower and saves time.

Part IV

Explain in detail

Question 1.
Define computer networking and Internet. Explain different developments on computer network and Internet.
Answer:
Computer networking:
Computer networking is a technique of digital telecommunications network one that permits nodes to share its resources.

This computer networking exchanges the data with each other through wired or wireless connections between different terminals called nodes.

Internet
The Internet is a network of global connections – comprising private, public, business, academic and government networks – linked by guided, wireless and fiber-optic technologies.

Computer networks and its development

Sno Period Method History
1 Late
1950
SAGE (Semi – Automatic Ground Environment) It was used at U.S Military Radar system.
2 1960 SABRE(Semi Automatic Business Research Envi­ronment) At Commercial Airline Reservation system online connected with two main frame computers.
Packet switching Packet switching was developed by Paul Baran and Donald De­vices
NPL network (National Physical Laboratory ) at united kingdom local area network (LAN) using line speed of 768kbit/s
3 1963 Intergalactic Computer network The intergalactic Computer network was sent by J.C.RLicklider
4 1965 Telephone switch At first widely used Telephone switch was introduced by Western Electric
5 1966 Wide Area Network(WAN) An experimental paper on has been published by Thomas Marill Lawrence G.Roberts published in the area of time sharing
6 1969­
1970
ARPANET First In 1969, four nodes of ARPANET were connected between four universities
7 1972 X.25 TCP/IP Using X.25 as commercial services were deployed then was using an infrastructure for expanding TCP/IP networks.
8 1973 Hosts CYCLADES was the first for making hosts which is responsible for reliable delivery of data
9 1973­
1979
Ethernet A memo at Xerox PARC was written by Robert Metcalfe describing Ethernet in 1973.
Aloha based networking system which was developed in the 1960s
In July 1976 the paper published “Ethernet: Distributed Packet Switching for Local Computer Networks” by Robert Metcalfe and David Boggs.
Collaborated on many patients received in 1977 and 1978.
Robert Metcalfe pursued making on the open standard in 1979.
10 1976 ARCNET ARCNET was created by John Murphy of Datapoint corporation in 1976
11 1995 NEW FIBRE OPTIC CA­BLES The speed capacity of transmission for Ethernet was slightly elevated from 10 Mbit/s to lOOMbit/sat 1995.
Frequently, the highest speeds up to 100 Gbit/s were appended (still 2016).

Question 2.
Explain the growth of computer networking,
Answer:
Growth on the popularity of cloud storage and cloud computing. On behalf of buying physical copies of games, music, and movies, increasingly downloading (or streaming) and buy digital licenses their need via Internet.

3G and 4G:
Developments on mobile network infrastructure- both deployments of 4Gand 3G networks (older) that have allow the people in their developed areas who can allow it to their smart mobile phones as video broadcasting system and as mobile television.

4G LTE
Even though 4G LTE mobile network was not reached by many parts of world, the industry of telecommunication has been hard working on the development of their next generation

5G:

  • It is a cellular communication Technology. This 5G intense to boost up the speed the mobile connections dramatically. Exactly how much customers was in need of this 5G connection and to go.
  • It might be tested on laboratory on by prototype versions of some elements then it may be standard 5G consumers were also interested on the promise of signal coverage with 5G.

Artificial intelligence

  • It will help to maintain, manage, and protect it.
  • It is also able to be a better predict traffic as it collects and analyzes data in real-time, some of network managers were better prepared for big events such as the World cup, Olympics, Valentine’s Day, which often put on the Internet under pressure.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 3.
Mention some uses of the network at business, home, mobile, social applications.
Answer:
(i) Networks in Business:

  1. In the twenty-first century, communications are necessary for successful business operations and technology for business interaction.
  2. Computer networks were faster, the Internet became full strength and wireless communications have been formed the way business performed.
  3. By the usage of latest technologies, such as cloud computing, are being used to allow globally without scarifying security or limiting user access.
  4. Internet conversations happen faster, Quick Decision making saves a lot of time, we all know that “time is money” in business.
  5. Through e-banking we can pay or receive money from or to the customer may be easily done via gateways or by online payments were much easier on this method.
  6. Here any type of business it might large or small scale B2C, B2B, B2G,C2B, C2C, C2G, G2B,G2C, G2G or commercial that transfer of information across the Internet can be done here.

(ii) Networks at Home:
Network at home is a group of devices such as computers, mobile, speakers, cameras, game systems, and printers that connect via the network with each other. Networks at home were connected in two ways they are

  1. Wired network
  2. Wireless network

A Wired network system connected with a network cable. For example speakers, CCTV, printers, outdoors, and scanners etc., with cables.
A Wireless network is connecting devices like tablets(.tab), indoor cameras and E-readers, etc., without cables (WiFi).
Network at home plays the main role to access all such as e-banking, e-leaming, e-governance, e-health, telemedicine, call centers, video conferencing, digitalization of memories, can easy to access and use by avoiding a lot of time and stacked at the queue.
From the home we ordered delicious food from various hotels and restaurants at a time without delay can be bought via the Internet.

(iii) Mobile Networks:
A mobile network is a network connecting devices without cable (wireless). Mobile computers, such as laptops, tablets, and handheld computers, were the fastest-growing segments.

(iv) Social Application:
The very fast and easiest way to cover all the people, who are connected to in social network media. For example WhatsApp, Facebook, Twitter, blogs, Pinterest, Linkedln, classmates, and so on. Through the above social media, we share our thoughts in different formats and the different size of files.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

12th Computer Applications Guide Introduction to Computer Networks Additional Important Questions and Answers

Part A

Choose the correct answers:

Question 1.
……………….. Method was used at the U.S Military Radar system.
a)SABRE
b)ARPANET
c) SAGE
d) Networking
Answer:
c) SAGE

Question 2.
Which one of the following resources cannot be shared?
(a) printer
(b) scanner
(c) speakers
(d) monitor
Answer:
(d) monitor

Question 3.
Packet Switching was invented in the year………………..
a)1964
b) 1958
c)1988
d)1991
Answer:
a)1964

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 4.
……………….. helps in sending and receiving money via payment gateway.
a) e-banking
b) online payment
c) e-governance
d) credit/debit card
Answer:
b) online payment

Question 5.
In networking, nodes are identified by their…………………………….
(a) Protocol
(b) Layer
(c) IP address
(d) TCL address
Answer:
(c) IP address

Question 6.
The initial name of the host is known as ………………..
a) TCP/IP
b) switch
c) nodes
d) CYCLADES
Answer:
d) CYCLADES

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 7.
In 1966……………….. was introduced for time-sharing.
a) WAN
b) MAN
c)LAN
d) Networking
Answer:
a) WAN

Question 8.
Expand SAGE
(a) Semi-Automatic Ground Environment
(b) Self – Auto General Engine
(c) Super – Automatic General Engine
(d) Super – Auto Ground Environment
Answer:
(a) Semi-Automatic Ground Environment

Question 9.
WWW was created in the year ………………..
a) 1965
b) 1993
c)1988
d)1989
Answer:
d)1989

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 10.
Network of network is called ………………..
a) Internet
c) Exnet
b) Intranet
d) Network
Answer:
a) Internet

Abbreviation

1. WWW – World Wide Web
2. IP – Internet protoco!
3. SAGE – Semi Automatic Ground environment
4. SABRE – Semi Automatic Business Research Environment
5. LAN – Locai Area Network
6. NPL – National Physical Laboratory
7. WAN – Wide Area Network
8. ARPANET – Advanced Research Projects Agency Network
9. TCP – Transmission Control Protoco!
10. ARCNET – Attached Resource Computer NETwork
11. LTE – Long Term Evolution
12. DDos – Distributed Denial of Service attacks.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Very short answers

Question 1.
What is the use of Packet switching?
Answer:
It used to transfer the information between computers and network,

Question 2.
Who use SAGE first? When?
Answer:
U.S Military Radar system used SAGE (Semi – Automatic Ground Environment) at late 1950

Question 3.
What do you mean by hosting?
Answer:
The service provider that leases this infrastructure, which is known as hosting.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 4.
What Is a Telephone switch?
Answer:
It is the first widely used to implemented true computer control.

Assertion and reason

Question 1.
Assertion (A): A set of computers connected together for the purpose of sharing resources is called as computer networks
Reason(R): Multimedia means that multiple forms of media are combined to gather and provide services
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)

Question 2.
Assertion (A): Networks of the network is called the Internet.
Reason(R): Computer which is connected to a network called as Intranet
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
c) (A) is true and (R) is false

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 3.
Assertion (A): The data that originates and terminates at these particular nodes is called a source and destination.
Reason(R): Connecting more than one device is called a network.
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)

Question 4.
Assertion (A): Packet switching was developed by Paul Baranand Donald Devices to transfer the information between computers and network.
Reason(R): NPL network (National Physical Laboratory) at UK local area network
(LAN) using line speed of 1068kbit/s was implemented by Nicholas Dech.
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
c) (A) is true and (R) is false

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 5.
Assertion (A): INTERNET Stands for INTERnational NETwork (Technology, telecom, intelligence)
Reason(R): INTERNET Stands for INTER connected computer NETwork (Science, space and environment)
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)

Question 6.
Assertion (A): Mobile network is the network connecting devices without cable (wireless).
Reason(R): Mobile computers, such as laptop, tablet, and handheld computers, were the fastest-growing segments.
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 7.
Assertion (A): 5G intense to boost up the speed of the mobile connections dramatically.
Reason(R): Artificial Network power algorithms will become most intelligent;
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)

Question 8.
Assertion (A): Covering a large area than a single transmitter, we can add more towers indefinitely and cannot be limited by any horizon limits.
Reason(R): Digital intelligence will help to maintain, manage, and protect it.
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
c) (A) is true and (R) is false

Question 9.
Assertion (A): computer networks were faster, the Internet became full strength and wireless communications has been transformed the way business performed.
Reason(R): The usage of latest technologies, such as cloud computing, are being used to allow globally without scarifying security or limiting user access.
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 10.
Assertion (A): Resource sharing means one device accessed by many systems.
Reason(R); Resource sharing is sharing such as printers, scanner, PDA, fax machine, and modems
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)
b) Both (A) and (R) are correct, but (R) is not the correct explanation of (A)
c) (A) is true and (R) is false
d) (A) is false and (R) is true
Answer:
a) Both (A) and (R) are correct and (R) is the correct explanation of (A)

Find the odd one on the following

1. (a) File server
(b) Web camera
(c) Speakers
(d) Websites
Answer:
(d) Websites

2. (a) WWW
(b) Digital Audio
(c) URL
(d) Digital Video
Answer:
(c) URL

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

3. (a) Mouse
(b) Storage Servers
(c) Applications
(d) Softwares
Answer:
(a) Mouse

4. (a) Source
(b) Destination
(c) Node
(d) WWW
Answer:
(d) WWW

5. (a) servers
(b) Mobile Phones
(c) Tabs
(d) Monitors
Answer:
(d) Monitors

6. (a) SAGE
(b) ARCNET
(c) ARPANET
(d) URL
Answer:
(c) ARPANET

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

7. (a) JohnMurphy
(b) PaulBoran
(c) James Gostling
(d) Leonard kliemock
Answer:
(c) James Gostling

8. (a) Technology
(b) Electronic
(c) Telecom
(d) Intelligence
Answer:
(b) Electronic

9. (a) Flipkart
(b) Amazon
(c) IOB
(d) E-bay
Answer:
(c) IOB

10. (a) YAHOO
(b) BING
(c) GOOGLE
(d) E-Banking
Answer:
(d) E-Banking

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

11. (a) Whatsapp
(b) Gmail
(c) Facebook
(d) Twitter
Answer:
(b) Gmail

12. (a) lG:2.4kb/s
(b) 2G:64kb/s
(c) 4G :100mb/s
(d) 3G:lMb/s
Answer:
(d) 3G:lMb/s

13. (a) SMS
(b) MMS
(c) video conferencing
(d) Farm ware
Answer:
(d) Farm ware

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

14. (a) printer
(b) Scanner
(c) Fax Machine
(d) Networking
Answer:
(d) Networking

15. (a) G2A
(b) B2C
(c) B2G
(d) G2G
Answer:
(a) G2A

16. (a) Speakers
(b) CCTV
(c) Scanner
(d) E-Readers
Answer:
(d) E-Readers

17. (a) Indoor Cameras
(b) Tablets
(c) Wi-fi
(d) printers
Answer:
(d) printers

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

18. (a) SAGE: 1950
(b) SABRE: 1960
(c) TCP/IP: 1975
(d) E-Readers
Answer:
(c) TCP/IP: 1975

19. (a) Hosts
(b) Ethernet
(c) F-Cables
(d) Modems
Answer:
(d) Modems

20. (a) Communication
(b) Money Saving
(c)-Learning
(d) Software Sharing
Answer:
(c)-Learning

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Matching the following

Question 1.
SABRE – 1995
Fibre Optic cables – 1960
Hosts – 1965
Telephone Switch -. 1973
a) 1234
b) 2341
c) 2143
d) 3124
Answer:
c) 2143

Question 2.
Resource Sharing – paper Work
Communication – Software
Money-Saving – PDA
Data Sharing – Groupware
a) 2341
b) 3412
c) 4312
d) 4321
Answer:
b) 3412

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 3.
Amazon – Social Media
Blog – Online Shopping
Gmail – Mobile Networks
3G/4G – E-mail
a) 1234
b) 2341
c) 2143
d) 3124
Answer:
c) 2143

Question 4.
Wired Network System – Bank Account
Wireless Network system – HandHeldComputres
Mobile Networks – indoor Cameras
Private Networks – CCTV
a) 1234
b) 4321
c) 2143
d) 3124
Answer:
b) 4321

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 5.
Cloud storage -Internet Computing
Cloud computing – Access in different Area
Flame Ware – abusive Messages
Hackers – skilled experts
a) 1234
b)4321
c) 2143
d) 2134
Answer:
a) 1234

Important years to remember:

1950 U.S Military Radar system used SAGE in late 1950
1960 SABRE for Commercial Airline Reservation system online connected with two mainframe computers.
1965 Telephone switch at first widely used telephone switch was introduced by Western Electric
1966 WAN (WIDE AREA NETWORK)was introduced for time-sharing.
1969­

1970

ARPANET was which underpinned the development
1973 TCP/IP Using X.25 as commercial services were deployed
1995 Speed capacity of transmission of the Ethernet technology was slightly increased from 10 Mbit/s to 100Mbit.
1998 Ethernet supported transmission speed capacity towards gigabit.
2004 Facebook was created

Part B

Short Answers

Question 1.
What are the disadvantages of the Internet?
Answer:
Disadvantages of the Internet:

  1. Simply wasting precious time on the Internet by surfing, searching for unwanted things.
  2. A lot of unnecessary information is also there, why because anyone can post anything on their webpage, blogs.
  3. Hackers and viruses can easily theft our more valuable information available on the Internet. There a lot of security issues are there in E-banking.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 2.
What is a node?
Answer:
The computer is connected to a network called nodes. The data that originates and terminates at these particular nodes is called a source and destination.

Question 3.
What is the use of E-Governance?
Answer:
E-Governance made it easier to collect their certificates online, in the early days a person spends more time collecting the certificates and he has to directly many more difficulties. To avoid this bribery at office e-governance via the Internet let a new path on all for the ordinary man.

Question 4.
Write a note on Software or data sharing?
Answer:

  1. Using a computer network, application or other software will be stored at a central computer or server.
  2. We can share one software from one to another. It provides a high reliable source of data.
  3. For example, all files can not be taken a backup or duplicate on more than one computer.
  4. So if one is not unavailable due to hardware failure or any other reason, the copies can be used.

Question 5.
What is Virus?
Answer:
Malware threats or computer warms that replicates it On its own is called a virus.

Question 6.
What are the innovations changed people lifestyle to use the Internet?
Answer:
Mobile Technology and Social Web are the two innovations have been changed the people lifestyle to use the Internet.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 7.
List some social media applications used on the Internet.
Answer:
WhatsApp, Facebook, Twitter, blogs, Pinterest, Linkedln, classmates.

Question 8.
What is the use of packet switching?
Answer:
Packet switching is used to transfer the information between computers and network

Question 9.
What are the two types of Networks at home?
Answer:
Networks at home were connected in two ways they are

  1. Wired network
  2. Wireless network

Question 10.
Define Flame Wars.
Answer:
Flame wars are nothing a lengthy exchange of angry or abusive messages between users of an online forum or another discussion area.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 11.
Who are Hackers?
Answer:
Hackers were skilled computer experts, some who with their technical knowledge access our accounts.

Question 12.
Define E-Readers.
Answer:
E-Readers is similarly called an e-book reader these were designed for the purpose of reading via mobile electronic device to read digital e-books and periodically.

Question 13.
What is the various Generation of Mobile Networks with their coverage?
Answer:
1G – 2.4 Kb/s
2G – 64 Kb/s
3G – 2 Mb/s
4G – lOOMb/s
5G – More than 1 Gb/s

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 14.
What is mean by Mobile Networks?
Answer:
A mobile network is a network connecting devices without cable (wireless). Mobile computers, such as laptops, tablets, and handheld computers, were the fastest-growing segments.

Part C

Explain in brief answer

Question 1.
Define Computer networking.
Answer:

  • Computer networking is a technique of digital telecommunications network one that permits nodes to share their resources from one to another.
  • This computer networking exchanges the data as the main element.
  • These links were transferred over cable media like optic cables or wire or wireless media such as Bluetooth and WIFI.

Question 2.
Write a short note on E-Banking?
Answer:

  • E-Banking plays an important role in our day-to-day life, via Internet it can be accessed anytime, anywhere 24/7.
  • The speed and efficiency were very much better than that of done by the counter at the bank.
  • Now a day’s online payments were done via the Internet to avoid standing in the queue at the office to paybiils with very low transaction fees.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 3.
What are the disadvantages of Using the Internet?
Answer:

  • Simply wasting precious time on the Internet by surfing, searching for unwanted things.
  • A lot of unnecessary’ information is also there, why because anyone can post anything on their webpage, blogs.
  • Hackers and viruses can easily theft our more valuable information available on the Internet, There a lot of security issues are there in E-banking.

Question 4.
How computer Networks helps in communication?
Answer:

  • Using computer networks, we can interact with different people from each other all over the world.
  • It provides powerful communication among widely separated employees, team, sections.
  • They can easily communicate at a very low cost via mobile, social media, telephone, e-mail, chatting, video telephone, video conferencing, SMS, MMS, groupware, etc…

Question 5.
What is Resource Sharing?
Answer:

  • Resource sharing means one device accessed by many systems.
  • It allows all kind of programs, equipment’s and available data to anyone via network to irrespective of the physical location of the resource of them.
  • Simply resource sharing is sharing such as printers, scanner, PDA, fax machine, and modems. For example, many computers can access one printer if it is in networks.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 6.
What is Data sharing?
Answer:

  • Using a computer network, application or other software will be stored at a central computer or server and share one software from one to another is called Data Sharing.
  • For example; All files cannot be taken a backup or duplicate on more than one computer. So if one is not unavailable due to hardware failure or any other reason, the copies can be used.

Part D 

Explain in detail

Question 1.
Explain how Social Networks are useful to Individuals and the community?
Answer:
The usefulness of Social Networks:
Besides being a fun place to meet and relax with people, social networking leads us some extremely useful benefits to their individuals and communities:

1. Group information sharing over long distances:
Although friends and family members can keep in contact via mobile phone calls or by text messages, social nets suggest a much richer environment for staying connected.

Too many scenarios such as sharing photo albums videos or convey their wishes someone, work better these networks because an entire group can participate together with one. Overall, group discussions became more convenient as not everyone needs to be online at the exact same moment to post comments.

2. Broadcast announcements:

  1. Cities can more comfortable to spread word of emergencies and natural calamities.
  2. Venues and local shops can advertise upcoming events on social networks.
  3. Businesses able market their products to customers (and retrieve some direct feedback).

3. Fostering diversity of thought:

  1. Some critics of social networks point out that online communities attract people by similar interests and backgrounds.
  2. Indeed, when the people with different opinions do get together on online, many discussions seem to degenerate into personal attacks and so-called “flame wars.”
  3. It can be argued, by online debates are healthy in the long run.
  4. Although individuals may begin with more extreme views, over time their thinking gets influenced may begin with more extreme views, over time their thinking gets influenced by the comments of others at least to some extent.
  5. For people who stuck with a busy schedule can have some relaxation and known current affairs, news via these social networks can easier to wish someone and keep in touch their follower, loveable person.

Samacheer Kalvi 12th Computer Applications Guide Chapter 10 Introduction to Computer Networks

Question 2.
Write in detail about The Internet Explosion.
Answer:
The Internet Explosion

  • Internet is simply defined as the Worldwide Web connection of individual networks operated by academic, industry, government, and private parties.
  • The Internet served to interconnect with laboratories engaged in government research, and from 1994 it is expanded to serve millions of users and multiple purposes in all parts of this universe.
  • In few years, the Internet built itself as a highly powerful platform that changed their way we do business and the way we communicate. The Internet promotes as the universal source of information for billions of people, at work, at home, at school. The Internet gave high communication medium, has given an international, “Globalised” at all dimension of the world.
  • Internet is growing all the time. By two things, have marked its evolution nowadays the mobile technology and the social web. These two innovations have been changed people’s lifestyles to use the Internet. We may find many communities on the social web. Facebook was created in 2004 but gowned into the worldwide networks all over more than 2,230 million active users.
  • Mobile technology on hand made it possible to great reach the Internet and increase the Internet user all over the world.
  • The Internet allows all to be democratic in mass media. Anyone can have a webpage in
  • Internet with very low investment. Similarly, any business can reach a very large market directly, economically, and fast, no matter of location or size of their business. Almost anyone who can read and write can have access and a presence in the World Wide Web with very low investment. People everywhere can express and publish their ideas and opinions via blogging.