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SDN & Overlay Networks interview questions

27 real SDN & Overlay Networks 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 Software-Defined Networking (SDN)?

Junior
  1. A.a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  2. B.an architecture that decouples the control plane from the data plane for centralized programmability
  3. C.a virtual network built on top of an existing physical network using encapsulation
  4. D.the part of a network device that actually forwards packets based on the forwarding table
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3. Which statement is correct?

Junior
  1. A.Software-Defined Networking (SDN) — a protocol that lets an SDN controller program the flow tables of switches directly
  2. B.Software-Defined Networking (SDN) — a VXLAN tunnel endpoint that encapsulates and decapsulates frames entering and leaving the overlay
  3. C.Software-Defined Networking (SDN) — an architecture that decouples the control plane from the data plane for centralized programmability
  4. D.Software-Defined Networking (SDN) — the part of a network device that decides how traffic is routed and builds forwarding tables
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4. What is Control plane?

Junior
  1. A.an overlay protocol that tunnels Layer 2 frames over a Layer 3 network using a 24-bit segment ID
  2. B.an architecture that decouples the control plane from the data plane for centralized programmability
  3. C.a two-tier data center topology where every leaf switch connects to every spine for uniform latency
  4. D.the part of a network device that decides how traffic is routed and builds forwarding tables
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6. Which statement is correct?

Junior
  1. A.Control plane — an architecture that decouples the control plane from the data plane for centralized programmability
  2. B.Control plane — a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  3. C.Control plane — the part of a network device that decides how traffic is routed and builds forwarding tables
  4. D.Control plane — a VXLAN tunnel endpoint that encapsulates and decapsulates frames entering and leaving the overlay
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7. What is Data plane?

Junior
  1. A.a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  2. B.the part of a network device that actually forwards packets based on the forwarding table
  3. C.an overlay protocol that tunnels Layer 2 frames over a Layer 3 network using a 24-bit segment ID
  4. D.a protocol that lets an SDN controller program the flow tables of switches directly
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9. Which statement is correct?

Junior
  1. A.Data plane — a two-tier data center topology where every leaf switch connects to every spine for uniform latency
  2. B.Data plane — a VXLAN tunnel endpoint that encapsulates and decapsulates frames entering and leaving the overlay
  3. C.Data plane — a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  4. D.Data plane — the part of a network device that actually forwards packets based on the forwarding table
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10. What is VXLAN?

Mid
  1. A.an overlay protocol that tunnels Layer 2 frames over a Layer 3 network using a 24-bit segment ID
  2. B.a protocol that lets an SDN controller program the flow tables of switches directly
  3. C.a two-tier data center topology where every leaf switch connects to every spine for uniform latency
  4. D.a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
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12. Which statement is correct?

Mid
  1. A.VXLAN — an overlay protocol that tunnels Layer 2 frames over a Layer 3 network using a 24-bit segment ID
  2. B.VXLAN — a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  3. C.VXLAN — a virtual network built on top of an existing physical network using encapsulation
  4. D.VXLAN — a VXLAN tunnel endpoint that encapsulates and decapsulates frames entering and leaving the overlay
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13. What is OpenFlow?

Mid
  1. A.a virtual network built on top of an existing physical network using encapsulation
  2. B.an architecture that decouples the control plane from the data plane for centralized programmability
  3. C.a protocol that lets an SDN controller program the flow tables of switches directly
  4. D.a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
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15. Which statement is correct?

Mid
  1. A.OpenFlow — the part of a network device that actually forwards packets based on the forwarding table
  2. B.OpenFlow — a two-tier data center topology where every leaf switch connects to every spine for uniform latency
  3. C.OpenFlow — a VXLAN tunnel endpoint that encapsulates and decapsulates frames entering and leaving the overlay
  4. D.OpenFlow — a protocol that lets an SDN controller program the flow tables of switches directly
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16. What is Network overlay?

Mid
  1. A.a virtual network built on top of an existing physical network using encapsulation
  2. B.an architecture that decouples the control plane from the data plane for centralized programmability
  3. C.the part of a network device that actually forwards packets based on the forwarding table
  4. D.the part of a network device that decides how traffic is routed and builds forwarding tables
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18. Which statement is correct?

Mid
  1. A.Network overlay — a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  2. B.Network overlay — a virtual network built on top of an existing physical network using encapsulation
  3. C.Network overlay — the part of a network device that decides how traffic is routed and builds forwarding tables
  4. D.Network overlay — an overlay protocol that tunnels Layer 2 frames over a Layer 3 network using a 24-bit segment ID
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19. What is VTEP?

Senior
  1. A.a protocol that lets an SDN controller program the flow tables of switches directly
  2. B.the part of a network device that actually forwards packets based on the forwarding table
  3. C.a VXLAN tunnel endpoint that encapsulates and decapsulates frames entering and leaving the overlay
  4. D.the part of a network device that decides how traffic is routed and builds forwarding tables
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21. Which statement is correct?

Senior
  1. A.VTEP — a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  2. B.VTEP — an overlay protocol that tunnels Layer 2 frames over a Layer 3 network using a 24-bit segment ID
  3. C.VTEP — a VXLAN tunnel endpoint that encapsulates and decapsulates frames entering and leaving the overlay
  4. D.VTEP — an architecture that decouples the control plane from the data plane for centralized programmability
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22. What is EVPN?

Senior
  1. A.a protocol that lets an SDN controller program the flow tables of switches directly
  2. B.a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  3. C.the part of a network device that decides how traffic is routed and builds forwarding tables
  4. D.a virtual network built on top of an existing physical network using encapsulation
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24. Which statement is correct?

Senior
  1. A.EVPN — a virtual network built on top of an existing physical network using encapsulation
  2. B.EVPN — an overlay protocol that tunnels Layer 2 frames over a Layer 3 network using a 24-bit segment ID
  3. C.EVPN — a BGP-based control plane that distributes MAC and IP reachability for VXLAN overlays
  4. D.EVPN — a protocol that lets an SDN controller program the flow tables of switches directly
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25. What is Spine-leaf fabric?

Senior
  1. A.an architecture that decouples the control plane from the data plane for centralized programmability
  2. B.a two-tier data center topology where every leaf switch connects to every spine for uniform latency
  3. C.the part of a network device that decides how traffic is routed and builds forwarding tables
  4. D.a protocol that lets an SDN controller program the flow tables of switches directly
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27. Which statement is correct?

Senior
  1. A.Spine-leaf fabric — the part of a network device that decides how traffic is routed and builds forwarding tables
  2. B.Spine-leaf fabric — a two-tier data center topology where every leaf switch connects to every spine for uniform latency
  3. C.Spine-leaf fabric — an architecture that decouples the control plane from the data plane for centralized programmability
  4. D.Spine-leaf fabric — a virtual network built on top of an existing physical network using encapsulation
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