ACSP EVPN-VXLAN and Network Virtualization 2

Question 1

Which EVPN route type carries MAC/IP advertisement information for individual host reachability?

Accepted Answer

Type-2 (MAC/IP Advertisement Route)

Answer

EVPN Type-2 routes carry MAC address bindings (and optionally IP address bindings), allowing VTEPs to learn remote host reachability without flooding.

Question 2

What is the key functional difference between EVPN Type-2 and Type-5 routes?

Accepted Answer

Type-2 carries MAC/IP host bindings within a VNI; Type-5 carries IP prefix routes for inter-subnet and external routing

Answer

Type-2 routes advertise individual host MAC/IP bindings within a Layer 2 VNI, while Type-5 routes advertise IP prefixes (subnets) for inter-subnet routing and external prefix distribution.

Question 3

How does EVPN ARP suppression improve efficiency in VXLAN overlay networks?

Accepted Answer

It enables VTEPs to answer ARP requests locally using cached MAC/IP bindings learned via EVPN

Answer

EVPN ARP suppression allows VTEPs to respond to ARP requests locally from their MAC/IP binding tables populated by EVPN Type-2 routes, eliminating unnecessary BUM traffic flooding across the fabric.

Question 4

What is an IRB (Integrated Routing and Bridging) interface in an EVPN-VXLAN deployment?

Accepted Answer

A virtual Layer 3 interface that performs both bridging within a VNI and routing between VNIs/subnets

Answer

An IRB interface acts as both the default gateway for hosts within a VXLAN segment and the routing interface for inter-subnet traffic, combining bridging and routing in one logical interface.

Question 5

In a symmetric IRB model for EVPN-VXLAN, how is inter-subnet traffic forwarded between VTEPs?

Accepted Answer

Traffic is routed at both the ingress and egress VTEPs using a dedicated Layer 3 VNI

Answer

In symmetric IRB, both the ingress VTEP and egress VTEP perform routing using a shared L3 VNI, distributing the routing load symmetrically and enabling consistent traffic paths.

(ACSP) Aruba Certified Switching Professional Practice Test

(ACSP) Aruba Certified Switching Professional Practice Test

ACSP EVPN-VXLAN and Network Virtualization 2