Chapterwise Question Bank CBSE Class 12 Computer Science (C++) – Communication Technologies

Chapterwise Question Bank CBSE Class 12 Computer Science (C++) – Communication Technologies

Topic – 1
Networking and Transmission Media

Exam Practice
Short Answer Type Questions [1 Mark]

Question 1:
Write two advantages of using an optical fibre cable over an ethernet cable to connect two service stations, which are 190 m away from each other.    Delhi 2013
Аnswer:
Low power Because signals in optical fibres degrade less, lower power transmitters can be used.
Higher datarate Due to higher bandwidth, data rate of optical fibre is more than the data rate of ethernet cable (upto 1 Gbps).

Question 2:
Differentiate between packet switching and message switching technique in network communication. Delhi 2011
Аnswer:
Message Switching In message switching data is stored in buffer form. The message is, sent to the nearest directly connected switching node. This process continues until data is delivered to the destination computer.
Packet Switching In this form of switching data is transferring into packet form. A fixed size of packet that can be transmitted across the network is specified. All the packets are stored in the main memory instead of disk.

Question 3:
What was the role of ARPANET in the computer network? Delhi; All India 2010
Аnswer:
ARPANET (Advanced Research Projects Agency Network) goal was to connect computers at different universities and US defense. ARPANET started with a handful of computer but it expanded rapidly.

Question 4:
Which of the following is not an unit for data transfer rate? All India 2010

1. MBPS
2. KBPS
3. SBPS
4. GBPS

Аnswer:
(iii) SBPS

Question 5:
Name two switching techniques used to transfer data between two terminals (computers). Delhi; All India 2009
Аnswer:
Switching techniques used to .transfer data between two terminals are:

1. Circuit switching
2. Packet switching.

Question 6:
What is the difference between packet switching and circuit switching techniques?
Аnswer:
In packet switching, a fixed size of packet that can be transmitted across the network is specified. All the packets are stored in the main memory instead of disk. As a result accessing time of packets is reduced. While circuit switched networks are based on the direct connection of two computers, with the connected computers making exclusive use of a single connecting link.

Question 7:
Name two transmission media for networking.
Аnswer:

1. Optical fibre
2. Satellite.

Question 8:
State two reasons for which you may like to have a network of computers instead of having standalone computers.
Аnswer:
The two reasons for networking are:

1. It helps the user to share data files.
2. It allows the user to communicate.

Question 9:
How bit rate is differ from baud rate?
Аnswer:
Bit rate is the number of bits transmitted during one second, whereas baud rate refers to the number of signal units per second that are required to represent those bits.
Bit rate = Number of bits/second Baud rate = Number of signal/second
or
Baud rate = bit rate/N
where, N is the number of bits represented by each signal shift.

Question 10:
How is co-axial cable different from optical fibre?    Delhi 2008
Аnswer:
The data transmission characteristics of co-axial cable are considerably better than twisted pair but not better in relation to optical fibre. The co-axial cable is being used as a shared cable network, with part of the bandwidth being used for data traffic. Optical fibre is difficult to install because they are fragile and need special care to install. One of the major advantage of optical fibre over co-axial cable is its complete immunity to noise, because the information is travelled on a modulated light beam.

Question 11:
Differentiate between Internet and Intranet.  Delhi 2006C
Аnswer:
Internet is a vast international network that is the most preferred WAN across the globe by joining computer networks together with telephone lines to form a backbone.”
Intranet is a network that exists exclusively within an organisation and that is based on Internet technology.

Topic – 2
Network Devices, Topologies and Protocol

Exam Practice
Short Answer Type Questions [1 Mark]

Question 1:
Which type of network (out of LAN, PAN and MAN ) is formed, when you connect two mobiles using bluetooth to transfer a picture file?    Delhi 2014
Аnswer:
When two mobiles are connected using bluetooth to transfer a picture file, a PAN(Personal Area Network) is created.

Question 2:
What is the difference between HTTP and FTP?  All India 2013
Аnswer:
FTP is a protocol used to upload files from a workstation to a FTP server or download files from a FTP server to a workstation.
HTTP is a protocol used to transfer files from a web server onto a browser in order to view a web page that is on the Internet.

Question 3:
Write one advantage of bus topology of network. Also, illustrate how four computers can be connected with each other using star topology of network? All India 2012
Аnswer:
Advantage of bus topology In bus topology, computers can be connected with each other using server (host) along a single length of cable.
Four computers can be connected with each other using server in the following way:

Question 4:
Write one advantage of star topology of network? Also, illustrate how five computers can be connected with each other using star topology of network? Delhi 2012
Аnswer:
Advantage of star topology No disruption to the network when connecting or removing devices.
Five computers can be connected with each other using server in the following way:

Question 5:
In networking, what is WAN? How is it different from LAN?    All India 2011
Аnswer:
The network which connects the different countries network is known as WAN. It can be a group of LANs. The largest existing WAN is Internet. LAN is a group of computers and network devices connected together, usually within the same building whereas WAN is not restricted to geographical location, although it might be confined within the bounds of state or country.

Question 6:
What is the function of modem? Delhi 2011C
Аnswer:
Function of modem is to convert analog signals into digital signals. Modem also converts digital signal into analog signal. It is also used to connect Internet.

Question 7:
Name any two components required for networking.    Delhi 2011C
Аnswer:
Switch/Hub and Repeaters.

Question 8:
What are repeaters?    Delhi 2011C
Аnswer:
Repeaters are electronic devices, that receive a signal and retransmit it at a higher level so that the signal covers longer distance. It’s required if the distance between source and destination is 90 m or more.

Question 9:
What is a hub?    Delhi 2008
Аnswer:
A hub is a hardware device used to connect several computers together.

Question 10:
Expand the following abbreviations: All India 2009

1. HTTP
2. ARPANET.

Аnswer:

1. HTTP HyperText Transfer Protocol.
2. ARPANET Advanced Research Projects Agency NETwork.

Question 11:
What is protocol? Which protocol is used to copy a file from/to a remote server?    All India 2009
Аnswer:
Protocol is a set of rules that two or more computers must follow to communicate on network.
FTP (File Transfer Protocol) is used to copy a file from/to a remotely located server.

Question 12:
What is protocol? Which protocol is used to search information from Internet using an Internet browser?    Delhi 2009
Аnswer:
Protocol is a set of rules that two or more computers must follow to communicate on network.
WWW (World Wide Web) is used for searching information from Internet using Internet browser.

Question 13:
What is the advantage of using SWITCH over HUB?  Delhi 2012C
Аnswer:
Switch provides a dedicated line at full bandwidth between two devices but hub doesn’t provide a dedicated line. Hub share the bandwidth.

Question 14:
What is difference between star topology and bus topology of network?    Delhi 2009; 2012C
Аnswer:
In star topology, nodes are connected to server individually whereas in bus topology all nodes are connected to server along a single length of cable.

Question 15:
What is modem?    All India 2008
Аnswer:
A modem is a data communication equipment that facilitates data communication through telephone lines. It is used to convert digital data into analog and vice-versa.

Question 16:
A company wants to form a network on their five computers to a server within the company premises. Represent star and ring topologies diagrammatically for this network.
Аnswer:

Long Answer Type Questions [4 Marks]

Question 17:
Trine Tech Corporation (TTC) is a professional consultancy company. The company is planning to set up their new offices in Inaia with its hub at Hyderabad. As a network adviser, you have to understand their requirement and suggest them the best available solutions. Their queries are mentioned as (i) to (iv) below.    Delhi 2014

1. Which will be the most appropriate block, where TTC should plan to install their server?
2. Draw a block to block cable layout to connect all the buildings in the most appropriate manner for efficient communication.
3. What will be the best possible connectivity out of the following, you will suggest to connect the new set up of offices in Bengalore with its London based office.
   • Satellite Link
   • Infrared
   • Ethernet
4. Which of the following device will be suggested by you to connect each computer in each of the buildings?
   • Switch
   • Modem
   • Gateway

Аnswer:

1. TTC should install its server in finance block as it is having maximum number of computers.
2. 
   The above layout is based on minimum cable length required, which is 120 metres in the above case.
3. Satellite Link.
4. Switch.

Question 18:
Granuda consultants are setting up a secured network for their office campus at Fa rida bad for their day-to-day office and web based activities. They are planning to have connectivity between 3 buildings and the head office situated in Kolkata. Answer the questions (i) to (iv) after going through the building positions in the campus and other details, which are given below.

1. Suggest the most suitable place (i.e. block) to house the server of this organisation. Also, give a reason to justify your suggested location.
2. Suggest a cable layout of connections between the building inside the campus.
3. Suggest the placement of the following devices with justification:
   (a) Switch
   (b) Repeater
4. The organisation is planning to provide a high speed link with its head office situated in the Kolkata using a wired connection. Which of the following cable will be most suitable for this job?
   (a) Optical fibre
   (b) Co-axial cable
   (c) Ethernet cable

Аnswer:

1. The most suitable place to house the server in JAMUNA because it has maximum number of computers.
2. 
3. (a) Switches are needed in every building to share bandwidth in every building.
   (b) Repeaters may be skipped as per above layout, (because distance is less than 100 m) however, if building RAVI and building JAMUNA are directly connected, we can place a repeater there as the distance between these two buildings is more than 100 m.
4. (b) Co-axial cable.

Question 19:
Freshminds University of India is starting its first campus in Ana Nagar of South India with its centre admission office in Kolkata. The university has three major blocks comprising of Office block, Science block and Commerce block is in 5 km area campus.
As a network expert, you need to suggest the network plan as per (i) to (iv) to the authorities keeping in mind the distance and other given parameters.    Delhi 2010

1. Suggest the authorities, the cable layout amongst various blocks inside university campus for connecting the blocks.
2. Suggest the most suitable place (i.e. block) to house the server for this university with a suitable reason.
3. Suggest an efficient device form the following to be installed in each of the block to connect all the computers,
   (a) Modem (b) Switch (c) Gateway
4. Suggest the most suitable (very high speed) service to provide data connectivity between admission office located in Kolkata and the campus located in Ana Nagar form the following options:
   • Telephone line
   • Fixedline dial-up connection
   • Co-axial cable network
   • GSM
   • Leased line
   • Satellite connection.

Аnswer:

1. 
2. The most suitable place to house the server is Science Block as it has maximum number of computers. Thus, reducing the cabling cost and increases efficiency of network.
3. (b) Switch is the device to be installed in each of the blocks to connect all the computers.
4. Satellite connection.

Question 20:
Quick Learn University is setting up its academic blocks at Prayag Nagar and planning to set up a network. The university has three academic blocks and one human resource centre as shown in the diagram below: Delhi 2011

1. Suggest the most suitable place (i.e. block/centre) to install the server of this university with a suitable reason.
2. Suggest an ideal layout for connecting these block/centre for a wired connectivity.
3. Which device you will suggest to be placed/installed in each of these blocks/centre to efficiently connect all the computers with in these blocks/centre ?
4. The university is planning to connect its admission office in the closest big city, which is more than 250 km from university, which type of network out of LAN, MAN or WAN will be formed? Justify your answer.

Аnswer:

1. HR centre as it has maximum number of computers.
2. 
3. Switch.
4. WAN as it is another city.

Question 21:
Tech Up Corporation (TUC) is a professional consultancy company. The company is planning to set up their new offices in India with its hub at Hyderabad. /Is a network adviser, you have to understand their requirement and suggest to them the best available solutions. Their queries are mentioned as (i) to (iv) below. All India 2014

1. What will the most appropriate block, where TUC should plan to install their server?
2. Draw a block to block cable layout to connect all the buildings in the most appropriate manner for efficient communication.
3. What will be the best possible connectivity out of the following, you will suggest to connect the new setup of offices in Bengalore with its London based office?
   • Infrared
   • Satellite Link
   • Ethernet Cable
4. Which of the following devices will be suggested by you to connect each computer in each of the buildings?
   • Gateway
   • Switch
   • Modem

Аnswer:

1. TUC should install its server in Human Resource Block as it is having maximum number of computers.
2. 
   The above layout is based on the minimum length of cable required, i.e. 140 m.
3. Satellite Link.
4. Switch.

Question 22:
G.R.K International Inc. is planning to connect its Bengaluru Office Setup with its Head Office in Delhi.
The Bengaluru Office G.R.K. International Inc. is spread across an area of approx. 1 square kilometres consisting of 3 blocks. Human Resources, Academics and Administration. You as a network expert have to suggest answers to the four queries (i) to (iv) raised by them.
Note Keep the distances between blocks and number of
computers in each block in mind, while providing them the solutions.

1. Suggest the most suitable block in the Bengaluru Office Setup to host the server. Give a suitable reason with your suggestion.
2. Suggest the cable layout among the various blocks within the Bengaluru Office Setup for connectiing the blocks.
3. Suggest a suitable networking device to be installed In each of the blocks essentially required for connecting computers inside the blocks with fast and efficient connectivity.
4. Suggest the most suitable media to provide secure, fast and reliable data connectivity between Delhi Head Office and the Bengaluru Office Setup.

Аnswer:

1. Human Resources, because it has maximum number of computers.
2. 
3. Hub/Switch.
4. Satellite.

Question 23:
Expertia Professional Global (EPG) in an online corporate training provider company for IT related courses. The company is setting up their new campus in Mumbai. You as a network expert have to study the physical locations of various buildings and the number of computers to be installed. In the planning phase, provide the best possible answers for the queries (i) to (iv) raised by them. Delhi 2013

1. Suggest the most appropriate building, where EPG should plan to install the server.
2. Suggest the most appropriate building to building cable layout to connect all three buildings for efficient communication.
3. Which type of network out of the following is formed by connection the computers of these three buildings?
   (a) LAN
   (b) MAN
   (c) WAN
4. Which wireless channel out of the following should be opted by EPG to connect to students of all over the world?
   (a) Infrared
   (b) Microwave
   (c) Satellite

Аnswer:

1. EPG should install the server in the Faculty Studio Building as it is having maximum number of computers.
2. 
3. (a) LAN (Local Area Network).
4. (c) Satellite.

Question 24:
Workalot consultants are setting up a secured network for their office campus of Gurgaon for their day-to-day office and web based activities. They are planning to have connectivity between 3 buildings and the head office situated in Mumbai. Answer the questions (i) to (iv) after going through the building positions in the campus and other details, which are given below: All India 2012

1. Suggest the most suitable place (i.e. building) to house the server of this organisation. Also, give a reason to justify your suggested location.
2. Suggest a cable layout of connections between the buildings inside the campus.
3. Suggest the placement of the following devices with justification :
   (a) Switch (b) Repeater
4. The organisation is planning to provide a high speed link with its head office situated in the Mumbai using a wired connection. Which of the following cables will be most suitable for this job?
   (a) Optical fibre
   (b) Co-axial cable
   (c) Ethernet cable

Аnswer:

1. Building RED is the suitable place to house this because it has maximum number of computers.
2. 
3. (a) Switches are needed in every building as they help share bandwidth in every building.
   (b) Repeaters may be skipped as per above layout (because distance is less than 100 m), however if building GREEN and building RED are directly connected, we can place a repeater there as the distance between these two buildings is more than 100 m.
4. (b) Co-axial cable.

Question 25:
Learn Together is an educational NGO. It is setting up its new campus at Jabalpur for its web-based activities. The campus has four compounds as shown in the diagram below: Delhi 2010

1. Suggest a cable layout of connections between the compounds.
2. Suggest the most suitable place (i.e compound) to house the server for this NGO. Also, provide a suitable reason for your suggestion.
3. Suggest the placement of the following devices with justification:
   (a) Repeater (b) Hub/Switch
4. The NGO is planning to connect its international office situated in Mumbai, which out of the following wired communication link’will you suggest for a very high speed connectivity?
   (a) Telephone analog line
   (b) Optical fibre
   (c) Ethernet cable.

Аnswer:

1. 
2. The most suitable place to house the server is Training Compound as it has a maximum number of computers.
3. (a) Repeater As per one layout (shown in (i )), the repeater can be avoided as all distances between the compounds are <=100 m.
   (b) Hub/Switch Training compound as it is hosting the server.
4. (b) Optical fibre.

Question 26:
Vidya for All is an educational NGO. It is setting up its new campus at Jaipur for its web-based activities. The campus has four buildings as shown in the diagram below: All India 2010

1. Suggest a cable layout of connection between the buildings.
2. Suggest the most suitable place (i.e. building) to house the server for this NGO. Also, provide a suitable reason for your suggestion.
3. Suggest the placement of the following devices with justification:
   (a) Repeater
   (b) Hub/Switch.
4. The NGO is planning to connect its international office situated in Delhi. Which out of the following wired communication links, will you suggest for a very high speed connectivity?
   (a) Telephone analog line
   (b) Optical fibre
   (c) Ethernet cable.

Аnswer:

1. 
2. The most suitable place to house the server for this NGO is Training Building because it has the maximum number of computers.
3. (a) Repeater As per one layout (shown in (i)),the repeater can be avoided as all distances between the compounds are <= 100 m.
   (b) Hub/Switch Training building as it is hosting the server.
4. (b) Optical fibre.

Question 27:
Eduminds University of India is starting its campus in a small town Pa ram pur of Central India with its centre admission office in Delhi. The university has three major buildings comprising of Admin building, Academic building and Research building in 5 km area campus.
As a network expert, you need to suggest the network plan as per (i) to (iv) to the authorities keeping in mind the distances and other given parameters.

1. Suggest the authorities, the cable layout amongst various buildings inside the university campus for connecting the buildings.
2. Suggest the most suitable place (i.e. building) to house the server of this organisations with a suitable reason.
3. Suggest an efficient device for the following to be installed in each of the building to connect all the computers
   (a) Gateway
   (b) Modem
   (c) Switch
4. Suggest the most suitable (very high speed) service to provide data connectivity between admission building located in Delhi and the campus located in Parampur form the following options:
   • Telephone line
   • Fixedline dial-up connection
   • Co-axial cable network
   • GSM
   • Leased line
   • Satellite connection.

Аnswer:

1. 
2. The most suitable place to house the server is Academic Building as it has maximum number of computers. Thus, it decreases the cabling cost and increase efficiency of network.
3. (c) Switch is to be installed in each of building to connect all the computers.
4. Satellite connection.

Question 28:
Institute of Distance Learning is located in Pune and is planning to go in for networking of four wings for better interaction. The details are shown below: Delhi 2009C

1. Suggest the type of networking (LAN, MAN, WAN) for connecting Lib Wing to Admin Wing. Justify your answer.
2. Suggest the most suitable place (i.e. wing) to house the server, with a suitable reason.
3. Suggest and placement of the following devices with reasons.
   (a) Repeater
   (b) Switch
4. The Institute is planning to link its study centre situated in Delhi. Suggest an economic way to connect it with reasonably high speed. Justify your answer.

Аnswer:

1. Since, the distance between Lib Wing and Admin Wing is small. So type of networking is small, i.e. LAN.
2. Since, maximum number of computers are in Student Wing, so suitable place to house the server is Student Wing.
3. (a) Repeater should be installed between Student Wing and Admin Wing as distance is more than 60 m.
   (b) Switch should be installed in each wing to connect several computers.
4. Broadband connection as it is between economical and speedy.

Question 29:
Bias Methodologies is planning to expand their network in India, starting with three cities in India to build infrastructure for research and development of their chemical products. The company has planned to set up their main office in Pondicherry at three different locations and have named their offices as Back Office, Research Lab and Development Unit. The company has one more research office namely Corporate Unit in Mumbai. A rough layout of the same is as follows: Delhi 2008

1. Suggest the type of network required (out of LAN, MAN, WAN) for connecting each of the following office units.
   • Research Lab and Back Office
   • Research Lab and Development Unit.
2. Which one of the following device, will you suggest for connecting all the computers with in each of their office units?
   • Switch/Hub
   • Modem
   • Telephone.
3. Which of the following communication medium, will you suggest to be procured by the company for connecting their local office units in Pondicherry for very effective (high speed) communication?
   • Telephone cable
   • Optical fibre
   • Ethernet cable.
4. Suggest a cable/wiring layout for connecting the company’s local office units located in Pondicherry. Also, suggest an effective method/technology for connecting the company’s office unit located in Mumbai.

Аnswer:

1. LAN and MAN.
2. Switch/Hub.
3. Optical fibre.
4. 
   An effective method/technology for connecting the company’s offices-unit located in Mumbai is dial-up or broadband.

Question 30:
China Middleton Fashion is planning to expand their network in India, starting with two cities in India of provide infrastructure for distribution of their product. The company has planned to set up their main office units in Chennai at the different locations and have named their offices as Production Unit, Finance Unit and Media Unit. The company has its Corporate Unit in Delhi. A rough layout of the same is as follows: All India 2008

1. Suggest the kind of network required (out of LAN, MAN, WAN) for connecting each of the following office units:
   • Production Unit and Media Unit
   • Production Unit and Finance Unit.
2. Which one of the following device will you suggest for connecting all the computers with in each of their office units?
   • Switch/Hub
   • Modem
   • Telephone.
3. Which of the following communication media, will you suggest to be procured by the company for connecting their local office units in Chennai for very effective (high speed) communication?
   • Telephone cable
   • Optical fibre
   • Ethernet cable.
4. Suggest a cable/wiring layout for connecting the company’s local office units located in Chennai. Also, suggest an effective method/technology for connecting the company’s office unit located in Delhi.

Аnswer:

1. MAN and LAN.
2. Switch/Hub.
3. Optical fibre.
4. 
   An effective method/technology for connecting the company’s office in Delhi and Chennai is broadband connection.

Question 31:
Gargi Education Service Ltd. is an educational organisation. It is planning to set up its India campus at Nepal with its head office at Mumbai. The Nepal campus has 4 main buildings- ADMIN, ENGINEERING, BUSINEES and MEDIA.
You as a network expert have to suggest the best network related solutions for their problems raised in (i) to (iv), keeping in mind the distance between the buildings and other given parameters.

1. Suggest the most appropriate location of the server inside the Nepal Campus (out of 4 buildings), to get the best connectivity for maximum number of computers. Justify your answer.
2. Suggest and draw the cable layout to efficiently connect various buildings within the Nepal Campus for connecting the computers.
3. Which hardware device will you suggest to be procured by the company to be installed to protect and control the Internet uses within the campus.
4. Which of the following will you suggest to establish the online face-to-face communication between the people in the ADMIN office of Nepal Campus and Mumbai Head Office?
   (a) Cable TV
   (b) E-mail
   (c) Video Conferencing
   (d) Text Chat 4,

Аnswer:

1. ADMIN is the most appropriate location of the Nepal Campus because it has maximum number of computers.
2. 
3. Firewall.
4. (c) Video Conferencing.

TOPIC – 3
Mobile Telecommunication and
Network Security

Very Short Answer Type Questions [1 Mark]

Question 1:
Write one characteristics each for 2G and 3G mobile technologies. Delhi 2014
Answer:
Characteristic of 2G mobile technology is that, it has introduced data services for mobile, starting with text messaging. Characteristic of 3G mobile technology is that it is faster than 2G and supports video calling.

Question 2:
What is the difference between video conferencing and chat? Delhi 2014
Answer:
Chat generally involves one-to-one communication. On the other hand, video conferencing means more than two persons are involved in a discussion.

Question 3:
Expand the following:

(i) GPRS
(ii) CDMA (Hi) GSM

Answer:

(i) GPRS General Packet Radio Services
(ii) CDMA Code Division Multiple Access
(iii) GSM Global System for Mobile Communication.

Question 4:
Write two characteristics of Wi-Fi. All India 2014
Answer:
Characteristics of Wi-Fi are as follows:

(i) It is a wireless solution for getting connected to the Internet.
(ii) It is handy as well as available throughout the journey.

Question 5:
What is the difference between E-mail and chat? All India 2014
Or
How is an E-mail different from a chat? Delhi 2008C
Answer:
In order to chat, you need have an account on the same service as the person you are chatting with. e.g. on the other hand, in case of E-mail, it is not necessary, i.e. you can have an account from any provider and you can establish your own.

Question 6:
Which of the following crime(s) is/are covered under cyber crime? Delhi 2013

(i) Stealing brand new hard disk from a shop.
(ii) Getting into unknown person’s social networking account and start messaging on his behalf.
(iii) Copying some important data from a computer without taking permission from the owner of the data.

Answer:

(ii) Getting into unknown person’s social networking account and start messaging on his behalf.

Question 7:
Which of the following crime(s) does not come under cyber crime? All India 2013

(i) Copying some important data from a computer without taking permission from the owner of the data.
(ii) Stealing keyboard and mouse from a shop.
(iii) Getting into unknown person’s social networking account and start messaging on his behalf.

Answer:

(ii) Stealing keyboard and mouse from a shop.

Question 8:
What out of the following, you will use to have an audio visual chat with an expert sitting in afar away place to fix-up technical issues? Delhi; All India 2012

(i) E-mail
(ii) VoIP
(iii) FTP

Answer:

(ii) VoIP.

Question 9:
Which out of the following does not come under cyber crime? Delhi 2012

(i) Stealing a mouse from someone’s computer.
(ii) Operating someone’s Internet banking account, without his knowledge.
(iii) Entering in someone’s computer remotely and copying data, without seeking his permission.

Answer:

(i) Stealing a mouse from someone’s computer.

Question 10:
Which of the following come under cyber crime? All India 2012

(i) Operating someone’s Internet banking account, without his knowledge.
(ii) Stealing a keyword from someone’s computer.
(iii) Working on someone’s computer with his/her permission.

Answer:

(i) Operating someone’s Internet banking account, without his knowledge.

Question 11:
What is VoIP? Delhi 2011
Answer:
VoIP (Voice over Internet Protocol) is simply the transmission of voice traffic over IP-based networks. VoIP has been around in one form or another, since 1973 when it began as an experiment by US.

Question 12:
What term we use for a software/hardware device, which is used to block, unauthorised access while permitting authorised communications? This term is also used for a device or set of devices configured to permit, deny, encrypt, decrypt, or proxy all (in and out) computer traffic between different security domains based upon a set of rules and other criteria. Delhi; All India 2010
Answer:
Firewall.

Question 13:
What are cookies? All India 2011
Answer:
Cookies are files stored temporarily on www browser’s computer, which allow the www server to store persistent information associated with browsing user on user’s system.

Question 14:
Expand the following abbreviations: Delhi 2013C

(i) HTTP
(ii) VoIP

Answer:

(i) HTTP HyperText Transfer Protocol
(ii) VoIP Voice over Internet Protocol

Question 15:
Which of the following will come under cyber crime? Delhi 2011

(i) Theft of a brand new sealed pack laptop.
(ii) Access to a bank account forgetting in unauthorised money transaction.
(iii) Modification in a company data with unauthorised access.
(iv) Photo copying a printed copy.

Answer:

(ii) Access to a bank account for getting in unauthorised money transaction.

Question 16:
What is the difference between virus and worm in the computer? All India 2010
Answer:
The main difference between virus and worm is the method by which they reproduce and spread. A virus is dependent upon a last life of boot sector and the transfer of files between machines to spread, while a worm can run completely independent and spread itself through network connection.

Question 17:
What is firewall? Delhi 2009C
Answer:
Firewall is a security system that prevents an unauthorised access to a private network. No information can leave or enter the private network.

Question 18:
Expand the following terminologies:

(i) GSM
(ii) WLL Delhi 2009C

Answer:

(i) GSM Global System for Mobile Communication.
(ii) WLL Wireless in Local Loop.

Question 19:
Write two applications of cyber law.
Answer:
The two applications of cyber law are:

(i) This law should be enforced between the two parties while making an agreement for transactions by using the cyber technology.
(ii) This law forms the basis of any legal penal action to be taken against the party, who has committed any kind of cyber crime.

Question 20:
How is a hacker different from a cracker? Delhi 2008
Answer:
Hackers These are the persons who get unauthorised access to the websites and replace them with other websites or unlawful information.
Crackers The person who uses certain software to trap authenticated information or to crack the security codes such as user names and password to illegally access the information of computers is called a cracker.

Question 21:
What is the importance of cyber law?
or
What is the significance of cyber law?
Answer:
Cyber law forms the basis of an agreement between the two parties making transactions using cyber technologies. It is enforced over all activities performed in which computer plays an important role. Any such activity, which is proved to be happened by breaking the rules of cyber law is punishable act and suitable punishments can be awarded under cyber crime act and sections before the court of law.

Question 22:
What is the difference between trojan horse and virus in terms of computer? Delhi 2010
Answer:
Trojan horse is a computer program, which carries out malicious operations without the user’s knowledge. It is a piece of harmful code placed within a healthy program. While virus is a malicious program that damage data and files and causes harm to computer system.

Question 23:
What do you mean by spam mails? How can you protect you mailbox from spams?
Answer:
Spam mails, also known as junk E-mail, is a subset of spam that involves nearly identical messages sent to numerous recipients by E-mail. We can protect our mailbox from spams by creating appropriate filters.

Question 24:
How does firewall protect our network? Delhi 2010
Answer:
A firewall is a part of a computer system or network that is designed to block unauthorised access while permitting authorised communications. It is a device or set of devices configured to permit, deny, encrypt, decrypt or proxy all (in and out) computer traffic between different security domains based upon a set of rules and other criteria.

Question 25:
Write two applications of cyber law?
Answer:
Cyber law refers to all the legal and regulatory aspects of Internet and the world wide web, including intellectual property, privacy and freedom of expression.

TOPIC – 4
Web Services, Open Source
Software and Cloud Computing

Very Short Answer Type Questions [1 Mark]

Question 1:
Write names of any two popular open source software, which are used as operating system. All India; Delhi 2014
Answer:
Following are the two popular open source softwares used as operating system:

(i) GNU
(ii) OpenSolaris.

Question 2:
Write any two important characteristics of cloud computing. Delhi; All India 2014
Answer:
Two characteristics of cloud computing are as follows:

(i) The provider’s computing resources are pooled together to serve multiple consumers with different physical and virtual resources dynamically assigned and reassigned according to the consumer demand.
(ii) It supports multi-tenacity, i.e. policy driven enforcement segmentation, isolation governance, service levels and chargeback/billing models for different consumer constituencies.

Question 3:
What is the difference between domain name and IP address? Delhi 2013
Answer:
IP address is an identifier for a computer or device on a TCP/IP network.
e.g. 1.160.10.240 could be an IP address.
A domain name is a name that identifies one or more IP addresses.
e.g. the domain name microsoft.com represents about a dozen IP addresses.

Question 4:
Write two advantages of using proprietary software over open source software. Delhi 2013
Answer:
The software is safe and guaranteed to be safe from dubious threats like programming bugs and viruses, thus providing ease of mind for the user. The software is easier to install and used as the production is planned and extensive research is carried out to ensure users purchase only the best.

Question 5:
Write two advantages of using open source software over proprietary software. All India 2013
Answer:
Open source software is a software, whose source code is available to customer and it can be modified and can be redistributed without any limitations whereas source code is not available in proprietary software. Open source software are generally free of cost.

Question 6:
Name one client-side scripting language and one server-side scripting language. Delhi; All India 2012
Answer:
Client-side scripting language—VB Script
Server-side scripting language—ASP

Question 7:
Give one suitable example of each URL and domain name. Delhi; All India 2012
Answer:
URL http://www.Gabsclasses.ccm/aboutus
Domainname www.Gabsclasses.com

Question 8:
Name two open source software alongwith its applications. Delhi 2012
Or
Give two examples of open source software. Delhi 2012C
Answer:
Two open source softwares alongwith its applications are open office, used to make documents and Linux is an operating system.

Question 9:
Name two proprietary softwares alongwith their applications. All India 2012
Answer:
Two proprietary softwares alongwith their applications are:

(i) MS-Office It is used to make a document, presentation, etc.
(ii) Tally It is used to maintain accounts.

Question 10:
Differentiate between XML and HTML. All lndia2011
Answer:
XML was designed to describe data and to focus on what data is. HTML was designed to display data and to focus on how data looks. HTML is about displaying information while XML is about describing information.

Question 11:
Find out of the following, identify client-side script(s) and server-side script(s). Delhi; All India 2011

(i) JavaScript
(ii) ASP
(iii) VB Script
(iv) JSP

Answer:
Client-side scripts: JavaScript, VB Script .
Server-side scripts: ASP, JSP.

Question 12:
What is Web 2.0? All India 2011
Answer:
Web 2.0 is associated with web application that facilitate participatory information sharing, interoperability, uses centered design and collaboration on the world wide web. It allows user to interact and collaborate with each other in a social media dialogue as creators of user generated content in a virtual community.

Question 13:
Write the full form of the following:

(i) GNU
(ii) XML

Answer:

(i) GNU GNU’s NOT UNIX.
(ii) XML extensible Markup Language.

Question 14:
Write the full form of the following:

(i) FTP
(ii) FSF

Answer:

(i) FTP File Transfer Protocol.
(ii) FSF Free Software Foundation.

Question 15:
Name any two common web browsers.
Answer:
Two common web browsers are:

(i) Mosaic
(ii) Internet Explorer.

Question 16:
Distinguish between website and web browser. Delhi 2009C
Answer:
Website It is a place on the net servers to keep web pages.
Web Browser It is a software application for retrieving, presenting and traversing information resources on the World Wide Web.

Question 17:
Name one commonly used open source Internet browser and one commonly used open source operating system. Delhi 2013C
Answer:
Open source Internet browser – Chromium
Open source operating system – Linux

Question 18:
Give the full form of the following terms:

(i) XML
(ii) FLOSS
(iii) HTTP
(iv) FTP

Answer:

(i) XML extensible Markup Language
(ii) FLOSS Free Libre and Open Source Software
(iii) HTTP HyperText Transfer Protocol
(iv) FTP File Transfer Protocol.

Question 19:
Why GNU is known as “GNU Not Unix”?
Answer:
GNU is a recursive acronym for “GNU Not Unix”, which was selected because its design is similar to Unix but it does not contain actual UNIX code.

Short Answer Type Question [2 Marks]

Question 20:
Explain the following terms in short:

(i) DHTML
(ii) ISP

Answer:

(i) DHTML DHTML stands for Dynamic HyperText Markup Language. It refers to the web content that changes according to user request. It will react the user input without sending requests to the web server.
(ii) ISP ISP stands for Internet Service Provider. It refers to the company that provides Internet Services. Some common examples of ISPs are Airtel, BSNL, Tata docomo, etc.

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