Assignment – Summer Vacation 2015-16 for XII Informatics Practices

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Q1. Give examples of two OSS in each of the following categories:
(a) OS                    (b) Graphics and animation         (c) Office software          (d) Internet related software
(e) Programming related software.
Q2. Define Network security? What kind of attacks can be made on data and computer networks?
Q3. What is a MAC address? What is the difference between a MAC address and an IP address?
Q4. What is Snooping?
Q5. Mr. Kant Sengupta wants to prevent unauthorized access to/from his company's local area network. Write the name of a system (software/hardware), which he should install to do the same.
Q6. Seven Brothers Fashion Inc. is a fashion company with design they are not able to share the information due to loss of signal in between. Which device out of the following should you suggest to be installed for a smooth communication?
(a)  Modem
(b)  Repeater
(c)  UPS
Q7. Which of the following is not a feature of Networking?
(i) Resource Sharing
(ii)  Reliability
(iii)  Uninterrupted Power Supply
(iv)  Reduced cost
Q8. Identify the type of Topology from the following:
(i)  In it, each node is connected  with the help of a single co-axial cable.
(ii)  In it, each node is connected with the help of independent cable with the help of a central switching (communication controller)
Q9. Give two characteristics of Star Topology. Also show it using a diagram with interconnection of 5 Computers.
Q10. What is the use of repeater in a network? How is it different from Hub?
Q11. Draw a network layout of bus topology to connect 5 client computers and 1 server computer.
Q12. Which of the following are open source software’s:  GNU, MS-Office, BOSS, Windows OS
Q13. Read the given activities carefully and mention in front of the activity whether that activity is snooping or eavesdropping:
(i)  Getting  someone’s  login  information  by  casually  watching  what  he/she  is typing.
(ii)  Setting up unauthorized parallel telephone lines
(iii)  Installing  some  software/hardware  which  captures  the  data  while  on   its way.
(iv)  Reading the files on someone’s computer in an unauthorized manner.
Q14. Kristen has typed the following text in the address bar:
http://www.cbse-international.com/help.htm
Explain  to  her  the  main  concept  of  URL  and  Domain  name  with  reference  to  the example given above.
Q15. What is meant be communication channels? Give two examples of guided media and two examples of unguided media.
Q16. Micro waves are
a. Uni directional              b. Omni directional
c. Guided media               d. Not used for communication.
Q17. Write some advantages and disadvantages of the following?
(a)  Optical Fiber    (c) Co-axial cable    (e) Twisted Pair wire
(b)  Radio Waves    (d) Microwave     (f) Satellites
Q18. Expand the terms: OSI, FLOSS, FSF, GNU, GPL, W3C, and OSS.
Q19. Give two advantages & two disadvantages of : (a)  Star        (b)Tree      (c) Bus

Q20. What do you understand by Domain Name Resolution?


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