Network Administrator Interview Questions

  1. What is a NIC?
  2. What is a MAC Address?
  3. When would you use a crosslink cable?
  4. What are the main advantages and disadvantages of Fiber-Optic-based networks?
  5. What is the difference between a Hub and a Switch?
  6. On which OSI layer can a router be found?
  7. What is CSMA/CD?
  8. What is multicast?
  9. What is broadcast?
  10. What is the difference between TCP and UDP?
  11. Describe some of the settings that are added by TCP and by UDP to the packet’s header.
  12. What are TCP Ports? Name a few.
  13. What is a TCP Session?
  14. What three elements make up a socket?
  15. What will happen if you leave the default gateway information empty while manually configuring TCP/IP?
  16. What will happen if you execute the following command: “arp -d *”?
  17. What is ICMP?
  18. When would you use the ping command with the “-t” switch?
  19. What command-line tool would help you discover for which port numbers your computer is listening?
  20. What is APIPA? How would you recognize it?
  21. What is a Cyclic Redundancy Check?
  22. What would you type in at a command prompt to view the IP settings for the computer that you are sitting at?
  23. What command would you type in at a command prompt to view the IP address of the remote computer?
  24. What is the W Value for class B?
  25. What is the Net ID of an IP Address of 18.9.25.3 with Subnet Mask of 255.0.0.0?
  26. What is CIDR?
  27. What is 255.255.255.255 used for?
  28. What is the maximum number of hosts for a Class B Network?
  29. What is the (default) class type of 195.152.12.1?
  30. What is the subnet mask for 10.0.10.1/17?
  31. What is the result when changing from a subnet mask of 255.255.224.0 to a subnet mask of 255.255.240.0?
  32. How can you access a shared folder from a remote computer? Name at least 3 methods.
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