Top VLAN Interview Questions 2024

Rashmi Bhardwaj | Routing & Switching,Interview Questions


  1. What is VLAN ?
  2. Which two benefits of creating VLANs ?
  3. What is Native VLAN?
  4. What is DTP ?
  5. An 802.1Q trunk is configured between the two switches SW1 and SW2 each connected on port fa0/1. SW1 has VLAN 10 is chosen as native while in SW2 native VLAN is not specified. What will happen in this scenario ?
  6. Which is the default Ethernet VLAN ?
  7. What are the VLAN membership types?
  8. What is Static VLAN?
  9. What is Dynamic VLAN?
  10. What is VLAN Frame Tagging?
  11. What is meant by “router on stick”?
  12. What are the different VLAN Frame tagging techniques?
  13. Difference between ISL and 802.1Q ?
  14. What type of traffic goes through native VLAN ?
  15. Provide commands to create VLAN ?
  16. How to configure Trunk port ?
  17. How to change native VLAN ?
  18. Give name of two link protocols used to carry multiple VLANs over a single link?
  19. Which command is used to view all VLAN information ?
  20. Which VLAN is not tagged by 802.1Q ?
  21. What is difference between Trunk and Access mode ?
  22. What is maximum number of VLANs permitted in 802.1Q ?
  23. What is maximum number of VLANs permitted in ISL ?
  24. What is the header size of 802.1Q ?
  25. What is the header size of ISL ?
  26. What is QinQ ?
  27. Two neighboring switch trunk ports are set to the auto mode with ISL trunking encapsulation mode. What will the resulting trunk mode become ?
  28. How to configure private VLAN ?
  29. What is the purpose on nonegotiate command in switch ?
  30. How to delete VLAN information from Switch ?
  31. You have configured your network to have 3 VLANs. How many broadcast domains do you have?
  32. You have configured s switch to have 3 VLANs with 10 ports in each VLAN. How many collision domains do you have?
  33. You have configured VLANs in your switched network and now want to check whether you have configured properly. Which command do we use ?
  34. What are the possible trunking modes for a switch port?
  35. What is VLAN and INTERVLAN ?
  36. Which protocol encapsulates Ethernet frames?
  37. What is difference between dynamic auto and dynamic desirable ?
  38. How to delete VLAN information from Switch?
  39. What command can configure a trunk port to stop sending and receiving DTP packets completely ?
  40. What command can be used on a Catalyst switch to verify exactly what VLANs will be transported over trunk link ?


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