VLAN Interview Questions


  • Which switching technology reduces the size of a broadcast domain?
  • Which protocols are used to configure trunking on a switch?
  • What is SVI ?
  • what is meant by "router on stick" ?
  • which is the default mode in switch ports ?
  • Difference between 802.1Q and ISL ?
  • Which are the two trunking protocols ?
  • Which Protocol encapsulate Etherframes ?
  • Which is the Vlan not tagged by 802.1Q ?
  • How to delete vlan information from switch ?
  • Difference between access and trunk mode ?
  • Difference between dynamic auto and dynamic desirable ?
  • what is the use of nonegociate command in switch ?
  • Explain different switch port modes ?
  • What is DTP ?
  • Can we see trunk interfaces in show vlan command ?
  • Which is the command used to see trunk interfaces ?
  • What is the maximum number of vlans permitted in 802.1Q and ISL?
  • what is the header size of 802.1Q ?
  • How does a switch forward traffic from a trunk port to appropriate VLAN.
  • Which feature would allow a VLAN to be sent untagged on a trunk port.
  • Can two vlans be assigned with two subnets from the same major network.
  • How does a switch forward traffic from a trunk port to appropriate VLAN.
  • Is it necessary to add the VLAN tag devices to the SEA, or is it suffice to just
  • have them defined within the Virtual Ethernet itself which is part of the SEA?
  • On a multilayer Catalyst switch, which interface command is used to convert a
  • Layer 3 interface to a Layer 2 interface?
  • Which protocol reduces administrative overhead in a switched network by
  • allowing the configuration of a new VLAN to be distributed to all the switches in a domain?
  • What is the difference between an access port and a trunk port?
  • What is Frame Tagging and different types of Frame Tagging?
  • Explain difference between 802.1Q and ISL ?
  • What is a Native VLAN and What type of traffic will go through Native VLAN?
  • What is Inter-Vlan Routing?
  • Two Switches are in VTP Server mode with different VLAN’s. Revision Number of both the switches is 0. Which switch will overwrite his own VLAN Database onto other, if both switches are in the same VTP Domain?
  • If a Switch is in Client mode, Can we enter into the configuration mode ?


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