Computer Networks Class 12 Preeti Arora Solution

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Q1. What is internet?


Q2. What is network?


Q3. What are the various types of topologies?


Q4. Describe bus topology and star topology.


Q5. Define the following terms:
(a) Baud
(b) Communication channel
(c) Hubs
(d) Repeaters


Q6. Define GSM and GPRS wireless communication system.


Q7. What is modem? Define the functioning of internal modem and external modem.


Q8. Expand and explain the following terms:
(a) PPP
(b) POP3
(c) VolP
(d) IRC


Q9. What is the significance of cyber law?


Q10. Describe the following networking devices:
(a) Hubs
(b) Repeaters
(c) Routers
(d) Bridges
(e) Gateways


Q11. What are Wi-Fi cards? Explain.


Q12. What is the significance of using firewalls and authentication?


Q13. What is a communication protocol? What is its role in networking?


Q14. What is HTTPS? How does it work?


Q15. What is Ethernet? What is Ethernet Card?


Q16. What are hubs? How are active hubs different from passive hubs?


Q17. What are the facilities provided by the Server in a network environment?


Q18. Which communication medium is to be suggested for very effective and fast communication in guided medium?


Q19. In a harsh industrial environment, which cable would you like to use?


Q20. Which media have the ability to communicate over oceans?


Q21. What is the difference between microwave and radio wave transmission?


Q22. Which transmission medium is useful for sparsely populated areas?


Q23. Which network is easy to expand?


Q24. Which device filters the data and which device can handle different protocol?


Q25. What is a network? What are its goals and applications?


Q26. Write some advantages and disadvantages of the following:
(a) Optical fibers
(b) Coaxial cables
(c) Twisted pair cables
(d) Radio waves
(e) Microwaves
(f) Satellites


Q27. Explain the role of HTTP protocol.


Q28. Define email.


Q29. What do you understand by data transfer rates?


Q30. What are hubs? What are its types?


Q31. What is the role of a switch in a network?


Q32. Briefly discuss the role of the following devices in the context of networking
(a) Repeater
(b) Router
(c) Bridge
(d) Gateway


Q33. Explain briefly:
(a) HTTP
(b) TCP/IP
(c) FTP


Q34. What is computing? How is it different from mobile computing?


Q35. When would you prefer
(i) hubs over repeaters
(ii) bridges over hubs
(iii) switches over other networking devices?