Communication Technologies (OLD) - Test Paper 01
CBSE TEST PAPER-01
Class-12 Computer Science(Communication and Network Concepts)
General Instruction: -
- Question No. 1 to 8 carry one marks,
- Question No. 9 to 10 carry four marks.
- Write two advantages and disadvantages of STAR topology.
- What are firewalls?
- What is the difference between Message Switching technique and Packet Switching technique?
- What are cookies?
- Expand the following:
a) TCP/IP b) XML c) CDMA d) WLL - What is Web Hosting?
- How is a Hacker different from a Cracker?
- Write one difference between Telnet and FTP.
- “Hindustan Connecting World Association” is planning to start their offices in four major cities in India to provide regional IT infrastructure support in the field of Education & Culture. The company has planned to set up their head office in New Delhi in three locations and have named their New Delhi offices as “Sales Office”, ”Head Office” and “Tech Office”. The company’s regional offices are located at ”Coimbatore”, “Kolkata” and “Ahmedabad”. A rough layout of the same is as follows :
Approximate distances between these offices as per network survey team is as follows :
In continuation of the above, the company experts have planned to install the following number of computers in each of their offices :Place From
Place To
Distance
Head Office
Sales Office
10 KM
Head Office
Tech Office
70 Meter
Head Office
Kolkata Office
1291 KM
Head Office
Ahmedabad Office
790 KM
Head Office
Coimbatore Office
1952 KM
Head Office
100
Sales Office
20
Tech Office
50
Kolkata Office
50
Ahmedabad Office
50
Coimbatore Office
50
(i) Suggest network type (out of LAN, MAN, WAN) for connecting each of the following set of their offices :
- Head Office and Tech Office
- Head Office and Coimbatore Office
(ii) Which device will you suggest to be procured by the company for connecting all the computers within each of, their offices out of the following devices?
- Modem
- Telephone
- Switch/Hub
(iii) Which of the following communication media, will you suggest to be procured by the company for connecting their local offices in New Delhi for very effective and fast communication?
- Ethernet Cable
- Optical Fiber
- Telephone Cable
(iv) Suggest a cable/wiring layout for connecting the company’s local offices located in New Delhi. Also, suggest an effective method/technology for connecting the company’s regional offices at “Kolkata”, “Coimbatore” and “Ahmedabad”. New York Avenue” is planning to expand their network in India, starting with two cities in India to provide infrastructure for distribution of their canned products. The company has planned to setup their main office in Ahmadabad, at three different locations and have named their office as “Work Office”, “Factory” and “Back Office”. The company has its Corporate Office in Delhi. A rough layout of the same is as follows:
Approximate distance between this office is as follows:
From
To
Distance
Work Office
Back Office
110 Mtr
Work Office
Factory
14 KM
Work Office
Corporate Unit
1280 KM
Back Office
Factory
13 KM
In continuation of the above, the company experts have planned to install the following number computers in each of their offices:
Work Office
200
Back Office
115
Factory
67
Corporate
75
i. Suggest the kind of network required (out of LAN, MAN, WAN) for connecting each of the following office units:
- Work Office and Factory
- Work Office and Back Office
ii. Which of the following communication media, you will suggest being procured by the company for connecting their local office units in Ahmadabad for very effective (High Speed) communication?
- Telephone Cable
- Optical Fiber
- Ethernet Cable
iii. Suggest a cable/wiring layout for connecting the company’s local office units located in Ahmadabad. Also, suggest an effective method/technology for connecting the company’s office unit located in Delhi.
iv. Name the place where the server is to be installed. Justify your answer.
CBSE TEST PAPER-01
Class-12 Computer Science(Communication and Network Concepts)
[Answers]
- Advantages of STAR topology:
(i) One device per connection.
(ii) Easy to access
Disadvantages of STAR topology:
i) Central node dependency
ii) Long cable length - A firewall is a system designed to prevent unauthorized access to or from a private network.
- Message Switching:-It is better known as store and forward. In this mechanism, a node on receiving a message, stores it till the appropriate route is not free, then forwards it on the route when the route is free.
Packet Switching:-It is best for data. In a packet-switched network, data are transmitted in discrete units called packets. A packet is a fixed length block of data for transmission. The maximum length of the packet is established by the network. Longer transmissions are broken up into multiple packets. The packets have headers with priority codes and source and destination addresses along with data to be sent. The packets are sent over the network node to node, kept there for a small time and then routed according to the information in its header. - Cookies are messages that a web server transmits to a web browser so that the web server can keep track of the user’s activity on a specific website.
- (i) TCP/IP:-Transmission Control Protocol/Internet Protocol
(ii) XML:-eXtensible Markup Language
(iii) CDMA:-Code Division Multiple access
(iv) WLL:-Wireless in Local Loop. - Web hosting means hosting web server application on a computer system through which electronic content on the internet is readily available to any web browser client.
- Hackers are more interested in gaining knowledge about computer systems and possibly using this knowledge for playful pranks.
Crackers are the malicious programmers who break into secure systems - FTP is File Transfer Protocol, and its only concern is to facilitate the transfer of files from one point to another whereas Telnet is simply a connection protocol that allows a user to connect to a remote server that is listening for Telnet commands.
- i) • Head Office and Tech Office- LAN
• Head Office and Coimbatore Office- WAN
ii) Switch/Hub
iii) Optical fiber
iv) Optical Fiber/Star Topology
Wireless/Satellite
- (i) Work Office and Factory – MAN
Work Office and Back Office – LAN
(ii) Optical Fibre
(iii) The suggested layout is shown below:
Technology for connecting to Delhi office – Satellite
(iv) The server is to be placed at Work Office as it contains a maximum number of computers.
