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

Type-1 (Ethernet Auto-Discovery Route)

Answer

Type-3 (Inclusive Multicast Ethernet Tag Route)

Answer

Type-5 (IP Prefix Route)

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 is used for underlay routing; Type-5 handles overlay tenant routing

Answer

Type-2 carries multicast group membership; Type-5 handles BUM traffic replication

Answer

Type-2 supports IPv4 only; Type-5 supports both IPv4 and IPv6

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

It blocks all ARP traffic between different tenant networks

Answer

It converts ARP broadcasts to IGMP multicast queries for distribution

Answer

It replaces ARP entirely with Neighbor Discovery Protocol for all tenants

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

A dedicated physical uplink interface for inter-VRF routing

Answer

A management-plane interface used to configure the VXLAN control plane

Answer

A redundant interface used by VTEP pairs for active-standby failover

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

Traffic is routed only at the ingress VTEP and then bridged to the egress VTEP

Answer

Traffic is bridged end-to-end without any routing occurring in the fabric

Answer

Traffic is forwarded to a centralized routing controller that makes all forwarding decisions

Question 6

What is the function of a BGP Route Distinguisher (RD) in EVPN?

Accepted Answer

To make EVPN routes globally unique in the BGP table when the same prefix exists in multiple VRFs

Answer

To encrypt EVPN routes during BGP advertisement between VTEPs

Answer

To set the administrative distance of routes learned via EVPN

Answer

To indicate which VNI is directly associated with a specific BGP EVPN route

Question 7

In traditional VXLAN without EVPN (flood-and-learn mode), what mechanism handles BUM (Broadcast, Unknown unicast, Multicast) traffic?

Accepted Answer

Statically configured ingress replication lists or multicast groups on each VTEP

Answer

BGP EVPN Type-3 routes advertising VTEP membership per VNI

Answer

OSPF flooding redistributed into the overlay network

Answer

Unicast encapsulation of all BUM traffic to a centralized SDN controller