ACSP EVPN-VXLAN and Network Virtualization

Question 1

What does VXLAN stand for?

Accepted Answer

Virtual Extensible Local Area Network

Answer

Virtual Extended Local Area Network

Answer

Variable Exchange LAN Architecture Network

Answer

Virtualized External Link Access Node

Question 2

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

Accepted Answer

4789

Answer

8472

Answer

6081

Answer

1194

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

To provide DHCP services to overlay tenants

Answer

To advertise BGP routes to external peers only

Answer

To terminate SSL/TLS tunnels for management traffic

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 12-bit VLAN-like tag supporting up to 4,096 segments

Answer

A 32-bit identifier supporting up to ~4 billion segments

Answer

A 16-bit identifier supporting up to ~65,536 segments

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

IPv4 Unicast (AFI 1, SAFI 1)

Answer

IPv6 Unicast (AFI 2, SAFI 1)

Answer

VPNv4 (AFI 1, SAFI 128)

Question 6

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

Accepted Answer

To carry encapsulated VXLAN packets between VTEPs using IP routing

Answer

To provide out-of-band management access for fabric switches

Answer

To handle raw multicast traffic for all tenant VLANs

Answer

To enforce security policies between VRFs without routing

Question 7

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

Accepted Answer

A loopback interface

Answer

The management (mgmt) interface

Answer

The SVI of the native VLAN

Answer

The OOBM (Out-of-Band Management) interface