1. What is internetworking?

  2. What are the user support layers of the OSI model?

  3. What are the network support layers of the OSI model?

  4. What happens when data moves from upper to lower OSI layers?

  5. What happens when data moves from lower to upper OSI layers?

  6. In which OSI layer are headers and trailers added?

  7. What is encapsulation and decapsulation?

  8. What is a reverse proxy?

  9. What is multicast?

  10. What is unicast, multicast, broadcast, and anycast?

  11. What is CGMP (Cisco Group Management Protocol)?

  12. What is load balancing?

  13. What is the difference between Bluetooth and Wi-Fi?

  14. What is OFDM (Orthogonal Frequency Division Multiplexing)?

  15. What is a transparent bridge?

  16. What is the minimum and maximum size of an ICMP packet?

  17. Why is OSPF faster than RIP?

  18. What are DNS message types?

  19. What is POP3?

  20. What is IMAP?

  21. What is a server farm?

  22. What is a zone-based firewall?

  23. What are the three methods of user authentication?

  24. What is the CIA triad?

  25. What is symmetric encryption?

  26. What is asymmetric encryption?

  27. What is IPsec?

  28. At which layer does IPsec operate?

  29. What is tunnel mode?

  30. What are digital signatures?

  31. What is authorization?

  32. What is IP spoofing?

  33. What is the difference between firewall and IPS?

  34. What is the purpose of DNS server?

  35. What port does DNS use?

  36. What is the importance of twisting in twisted-pair cable?

  37. What is the maximum length of a UTP cable?

  38. What is multiplexing?

  39. What are the types of multiplexing?

  40. Which multiplexing is used in fiber optics?

  41. Which multiplexing is used for analog signals?

  42. Which multiplexing is used for digital signals?

  43. What is checksum in networking?

  44. What arithmetic is used in checksum calculation?

  45. What is piggybacking?

  46. What are the advantages of piggybacking?

  47. What is a datagram network?

  48. What is a routing table?

  49. Can routing tables have duplicate destination entries?

  50. What is flow control in TCP?