Practice Test Geeks(ACSP) Aruba Certified Switching Professional Practice Test
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EVPN-VXLAN and Network Virtualization Flashcards

7 cards from real ACSP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What does VXLAN stand for?

    Answer: Virtual Extensible Local Area Network

    VXLAN stands for Virtual Extensible Local Area Network, a network virtualization technology that encapsulates Layer 2 frames within UDP packets to extend Layer 2 domains over Layer 3 infrastructure.

  2. What UDP destination port does VXLAN use by default for encapsulation, as standardized by IANA?

    Answer: 4789

    VXLAN uses UDP destination port 4789, as standardized by IANA in RFC 7348, ensuring interoperability across vendor implementations.

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

    Answer: To encapsulate and decapsulate VXLAN packets at the network edge

    A VTEP encapsulates outgoing Layer 2 frames into VXLAN/UDP packets and decapsulates incoming VXLAN packets back to Layer 2, sitting at the boundary between overlay and underlay.

  4. What is a VNI (VXLAN Network Identifier) and how many unique values does it support?

    Answer: A 24-bit identifier supporting up to ~16 million unique tenant segments

    A VNI is a 24-bit field that uniquely identifies a VXLAN segment, providing approximately 16 million unique tenant network identifiers versus only 4,096 VLANs.

  5. In EVPN-VXLAN, which BGP address family is used to distribute MAC and IP reachability information between VTEPs?

    Answer: L2VPN EVPN (AFI 25, SAFI 70)

    EVPN uses the L2VPN EVPN address family (AFI 25, SAFI 70) to distribute MAC/IP reachability, multicast group info, and other overlay control-plane data via BGP.

  6. What is the primary purpose of the underlay network in a VXLAN fabric deployment?

    Answer: To carry encapsulated VXLAN packets between VTEPs using IP routing

    The underlay is the routed IP network providing connectivity between VTEPs, enabling VXLAN-encapsulated overlay packets to traverse the physical infrastructure.

  7. On Aruba AOS-CX, which interface type is typically configured as the VTEP source interface for VXLAN tunnels?

    Answer: A loopback interface

    A loopback interface is used as the VTEP source because it is always logically up, stable, and reachable via multiple equal-cost paths in the underlay for redundancy.