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Topic: VXLAN & EVPNSwitch
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2.0 Virtualization

VXLAN & EVPN Practice Questions

VXLAN encapsulation, VTEPs, and EVPN control-plane learning.

One solved question, so you can see how these are marked

What destination UDP port is used by standard VXLAN packets?

4789

Standard IETF VXLAN uses UDP destination port 4789 for encapsulation header transport.

Every question in the set below is marked like this. The answers stay hidden until you pick one.

All 7 VXLAN & EVPN questions in this set

Answers and explanations appear when you work through the set above.

  1. What is the length of the Virtual Network Identifier (VNI) field in a standard VXLAN header?

    • 12 bits
    • 16 bits
    • 24 bits
    • 32 bits

  2. In a VXLAN EVPN fabric, which BGP EVPN route type advertises a host's MAC address together with its IP binding so remote VTEPs can suppress ARP flooding?

    • Route Type 2 (MAC/IP Advertisement)
    • Route Type 3 (Inclusive Multicast Ethernet Tag)
    • Route Type 5 (IP Prefix)
    • Route Type 1 (Ethernet Auto-Discovery)

  3. What is the primary role of a VXLAN Tunnel Endpoint (VTEP) inside a VXLAN overlay network?

    • Generates BGP EVPN updates on behalf of hosts that do not run IP.
    • Encapsulates frames in VXLAN/UDP/IP and decapsulates them on arrival.
    • Assigns public IP addresses to the endpoints attached to the overlay.
    • Resolves DNS names for overlay hosts across hybrid and multi-cloud environments.

  4. By how many bytes does VXLAN encapsulation grow a frame, and what does that imply for the underlay network?

    • 50 bytes, so the underlay MTU must be raised to avoid fragmentation
    • 4 bytes, the same overhead as adding one 802.1Q tag to the frame
    • 8 bytes, because only the VXLAN header itself is added to the frame
    • 0 bytes, because VXLAN reuses the original Ethernet header as the outer

  5. Which control plane protocol is standardized to distribute MAC address reachability and IP binding information across VXLAN Overlay networks (EVPN)?

    • OSPFv2 with opaque LSAs
    • MP-BGP EVPN
    • RIPng with route tags
    • IS-IS Level 1 with TLV 22

  6. What method does VXLAN utilize in data-plane-only learning environments to handle Broadcast, Unknown Unicast, and Multicast (BUM) traffic across the IP fabric?

    • MP-BGP EVPN Type 3 route discovery alone
    • Head-End Replication or underlay multicast
    • Dynamic DNS updates between the VTEPs
    • LISP Map-Request broadcasts sent to every VTEP

  7. What device or functional entity terminates VXLAN tunnels by encapsulating inner Ethernet frames into IP/UDP packets and decapsulating incoming VXLAN packets?

    • VIM (Virtualized Infrastructure Manager)
    • VTEP (VXLAN Tunnel Endpoint)
    • VNF (Virtual Network Function)
    • VNFM (VNF Manager)