Switching & VLANs interview questions

60 real Switching & VLANs questions from the Networking bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is MAC address?

Junior
  1. A.forwarding traffic between VLANs using a router or Layer 3 switch
  2. B.a logical Layer 2 segment that isolates broadcast domains within a switch
  3. C.a 48-bit hardware address burned into a network interface, written in hex
  4. D.a link that carries multiple VLANs by tagging frames with a VLAN ID
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3. Which statement is correct?

Junior
  1. A.MAC address — a switch port assigned to a single VLAN that carries untagged frames
  2. B.MAC address — the switch with the lowest bridge ID that becomes the reference point of the spanning tree
  3. C.MAC address — the VLAN whose frames cross an 802.1Q trunk untagged
  4. D.MAC address — a 48-bit hardware address burned into a network interface, written in hex
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4. What is VLAN?

Junior
  1. A.limiting which or how many MAC addresses may use a switch port
  2. B.a logical Layer 2 segment that isolates broadcast domains within a switch
  3. C.a frame addressed to a single destination MAC address
  4. D.a link that carries multiple VLANs by tagging frames with a VLAN ID
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6. Which statement is correct?

Junior
  1. A.VLAN — a faster-converging version of spanning tree that reduces blocking delays
  2. B.VLAN — a logical Layer 2 segment that isolates broadcast domains within a switch
  3. C.VLAN — a protocol that prevents Layer 2 loops by blocking redundant paths
  4. D.VLAN — limiting which or how many MAC addresses may use a switch port
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7. What is Broadcast domain?

Junior
  1. A.limiting which or how many MAC addresses may use a switch port
  2. B.the switch's mapping of MAC addresses to physical ports for frame forwarding
  3. C.a network segment where frames can collide, eliminated by full-duplex switching
  4. D.the set of devices that receive a broadcast frame sent by any member
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9. Which statement is correct?

Junior
  1. A.Broadcast domain — the set of devices that receive a broadcast frame sent by any member
  2. B.Broadcast domain — a faster-converging version of spanning tree that reduces blocking delays
  3. C.Broadcast domain — a dedicated VLAN that separates IP phone traffic for QoS and security
  4. D.Broadcast domain — a switch port assigned to a single VLAN that carries untagged frames
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10. What is Collision domain?

Junior
  1. A.a dedicated VLAN that separates IP phone traffic for QoS and security
  2. B.a network segment where frames can collide, eliminated by full-duplex switching
  3. C.a frame addressed to a single destination MAC address
  4. D.a virtual Layer 3 interface on a switch representing a VLAN for routing
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12. Which statement is correct?

Junior
  1. A.Collision domain — a Layer 2 device that forwards frames based on learned MAC addresses
  2. B.Collision domain — a network segment where frames can collide, eliminated by full-duplex switching
  3. C.Collision domain — bundling multiple physical links into one logical link for bandwidth and redundancy
  4. D.Collision domain — a link that carries multiple VLANs by tagging frames with a VLAN ID
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13. What is MAC address table?

Junior
  1. A.the set of devices that receive a broadcast frame sent by any member
  2. B.the switch's mapping of MAC addresses to physical ports for frame forwarding
  3. C.a Layer 2 device that forwards frames based on learned MAC addresses
  4. D.a link that carries multiple VLANs by tagging frames with a VLAN ID
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15. Which statement is correct?

Junior
  1. A.MAC address table — a protocol that prevents Layer 2 loops by blocking redundant paths
  2. B.MAC address table — a logical Layer 2 segment that isolates broadcast domains within a switch
  3. C.MAC address table — a virtual Layer 3 interface on a switch representing a VLAN for routing
  4. D.MAC address table — the switch's mapping of MAC addresses to physical ports for frame forwarding
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16. What is 802.1Q trunk?

Mid
  1. A.a link that carries multiple VLANs by tagging frames with a VLAN ID
  2. B.a network segment where frames can collide, eliminated by full-duplex switching
  3. C.the set of devices that receive a broadcast frame sent by any member
  4. D.a Layer 2 device that forwards frames based on learned MAC addresses
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18. Which statement is correct?

Mid
  1. A.802.1Q trunk — forwarding traffic between VLANs using a router or Layer 3 switch
  2. B.802.1Q trunk — a switch port assigned to a single VLAN that carries untagged frames
  3. C.802.1Q trunk — the switch's mapping of MAC addresses to physical ports for frame forwarding
  4. D.802.1Q trunk — a link that carries multiple VLANs by tagging frames with a VLAN ID
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19. What is Access port?

Mid
  1. A.a 48-bit hardware address burned into a network interface, written in hex
  2. B.a switch port assigned to a single VLAN that carries untagged frames
  3. C.limiting which or how many MAC addresses may use a switch port
  4. D.the switch with the lowest bridge ID that becomes the reference point of the spanning tree
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21. Which statement is correct?

Mid
  1. A.Access port — a logical Layer 2 segment that isolates broadcast domains within a switch
  2. B.Access port — the switch with the lowest bridge ID that becomes the reference point of the spanning tree
  3. C.Access port — the switch's mapping of MAC addresses to physical ports for frame forwarding
  4. D.Access port — a switch port assigned to a single VLAN that carries untagged frames
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22. What is Native VLAN?

Mid
  1. A.a logical Layer 2 segment that isolates broadcast domains within a switch
  2. B.the VLAN whose frames cross an 802.1Q trunk untagged
  3. C.bundling multiple physical links into one logical link for bandwidth and redundancy
  4. D.a faster-converging version of spanning tree that reduces blocking delays
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24. Which statement is correct?

Mid
  1. A.Native VLAN — a protocol that prevents Layer 2 loops by blocking redundant paths
  2. B.Native VLAN — forwarding traffic between VLANs using a router or Layer 3 switch
  3. C.Native VLAN — a Cisco protocol that propagates VLAN configuration across a switch domain
  4. D.Native VLAN — the VLAN whose frames cross an 802.1Q trunk untagged
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25. What is Spanning Tree Protocol (STP)?

Mid
  1. A.the switch with the lowest bridge ID that becomes the reference point of the spanning tree
  2. B.a protocol that prevents Layer 2 loops by blocking redundant paths
  3. C.a network segment where frames can collide, eliminated by full-duplex switching
  4. D.a Layer 2 device that forwards frames based on learned MAC addresses
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27. Which statement is correct?

Mid
  1. A.Spanning Tree Protocol (STP) — a dedicated VLAN that separates IP phone traffic for QoS and security
  2. B.Spanning Tree Protocol (STP) — a protocol that prevents Layer 2 loops by blocking redundant paths
  3. C.Spanning Tree Protocol (STP) — overwhelming a switch's MAC table so it floods frames out all ports
  4. D.Spanning Tree Protocol (STP) — limiting which or how many MAC addresses may use a switch port
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28. What is Inter-VLAN routing?

Mid
  1. A.a faster-converging version of spanning tree that reduces blocking delays
  2. B.the set of devices that receive a broadcast frame sent by any member
  3. C.forwarding traffic between VLANs using a router or Layer 3 switch
  4. D.a logical Layer 2 segment that isolates broadcast domains within a switch
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30. Which statement is correct?

Mid
  1. A.Inter-VLAN routing — the switch's mapping of MAC addresses to physical ports for frame forwarding
  2. B.Inter-VLAN routing — a link that carries multiple VLANs by tagging frames with a VLAN ID
  3. C.Inter-VLAN routing — a protocol that prevents Layer 2 loops by blocking redundant paths
  4. D.Inter-VLAN routing — forwarding traffic between VLANs using a router or Layer 3 switch
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