Computer Networks, Network Security and Web Technology Questions

1. What does a firewall do?
2. What are public key and private key cryptographies?
3. What do you know about Digital Signatures?
4. Can you expand VIRUS?
5. Expand PING and explain how it works?

6. What bit addressing system does Ethernet have?
7. Can you differentiate between Security and Protection?
8. Can you differentiate between a router, abridge, a repeater, a gateway, a hub and a switch? (This is a very common question. Two or three of these may be asked to be differentiated from one another)
9. How many hosts are possible in a Class C IP Address?
10. Tell me something in brief about Classes of IP addresses?

11. What’s the advantage of IPv6 over IPv4?
12. Some people say that Subnetting and Supernetting are two important concepts of networking. Do you agree? Tell me something interesting about them.
13. Why is OSI layered?
14. Tell me something about ISO/OSI?
15. Why do we need Congestion Control techniques?

16. Tell me something about fragmentation of data packets?
17. Out of the two – TCP/IP and UDP – which is connectionless protocol. Why? Compare.
18. Which protocol is used in Video Streaming – TCP/IP or UDP?
19. Tell me something about Client-Server and Peer-to-Peer architectures?
20. Have you heard about torrents? How does a torrent file works?

21. Which Flip Flop is most used in data communication over networks? (Ans: D Flip Flop,
as it gives delay. In most of the ports, this flip flop is used, as the sender and client have
to be synchronized. It’s also useful when the receiver is slow compared to the sender)
22. Tell me something about Piggy-Backing?
23. Tell me about HTTP, SMTP, SNMP, FTP, ICMP…..? (Students may expect questions on
any one of such layer protocols)
24. What is RFC?
25. Which protocol is called ‘watch dog’?

26. Tell me something about POP and SMTP in E-mail services? Give an example of
POP/SMTP client? (E.g: MS Outlook, Mozilla Thunderbird, etc.)
27. What are the advantages of IMAP over POP?
28. What is Loop Back address? Explain?
29. What is ARP?

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