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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.

Read the first 7 EVPN-VXLAN and Network Virtualization flashcards as text

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

    Answer: Type-2 (MAC/IP Advertisement Route)

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

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

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

    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.

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

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

    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.

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

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

    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.

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

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

    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.

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

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

    An RD is prepended to EVPN routes to make them globally unique in the BGP table, allowing identical prefixes from different VRFs or tenants to coexist without ambiguity.

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

    Answer: Statically configured ingress replication lists or multicast groups on each VTEP

    Without EVPN, traditional VXLAN relies on either IP multicast groups in the underlay or statically configured head-end replication lists to flood BUM traffic to all VTEPs in a VNI.