ACSP EVPN-VXLAN and Network Virtualization

Question 1

What does VXLAN stand for?

Accepted Answer

Virtual Extensible Local Area Network

Answer

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.

Question 2

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

Accepted Answer

4789

Answer

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

Question 3

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

Accepted Answer

To encapsulate and decapsulate VXLAN packets at the network edge

Answer

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.

Question 4

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

Accepted Answer

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

Answer

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.

Question 5

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

Accepted Answer

L2VPN EVPN (AFI 25, SAFI 70)

Answer

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.

(ACSP) Aruba Certified Switching Professional Practice Test

(ACSP) Aruba Certified Switching Professional Practice Test

ACSP EVPN-VXLAN and Network Virtualization