TCP/IP Interview Questions

  1. What is IP?
  2. What is IPSec?
  3. What are sockets?
  4. What is TCP/IP model?
  5. How is TCP/IP defined?
  6. Why we have to use router?
  7. How is data send by IP layer?
  8. TCP/IP has how many layers?
  9. DNS uses which protocol? Why?
  10. Which layer is closer to the user?
  11. How Is IP Carried On A Network?
  12. ARP resolves what? Address or IP?
  13. RARP resolves what? Address or IP?
  14. Error control is down in which layer?
  15. Name 4 example of application layer?
  16. How does ARP response the request?
  17. Does IP Protect Data On The Network?
  18. Where do I find assigned port numbers?
  19. What is the data unit of “Transport layer”?
  20. What is the upper layer name of OSI layer?
  21. What is the port number of Telnet and DNS?
  22. What is the port number of ftp(data) and ftp?
  23. Switch operates on which layer of OSI model?
  24. What is the full form of OSI and TCP/IP model?
  25. Can the TCP keep alive timeouts be configured?
  26. What is the way to establish a TCP connection?
  27. How does TCP try to avoid network meltdown?
  28. What are the difference between TCP and UDP?
  29. How do applications coexist over TCP and UDP?
  30. How can I measure the performance of an IP link?
  31. What are the differences between OSI and TCP/IP model?
  32. What is the difference between flow control and error control?
  33. What are the differences among router, switch, bridge and hub?
  34. You have one IP: In which layere this IP works?
  35. Differentiate between forward lookup and reverse lookup in DNS?
  36. What IP addresses should I assign to machines on a private internet?
  37. Should we deploy IPSEC-based security or certificate-based security?
  38. What is the Role of TCP/IP in data transmission from source to destination?
  39. You are in home. But you need to access the office server router. How can you do that?
  40. How can I detect that the other end of a TCP connection has crashed? Can I use “keep lives” for this?