EVPN Traffic Flow and MAC Learning/distribution JN0-664 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   In an EVPN-MPLS network, PE1 receives a unicast frame from a local CE destined to a MAC address that PE1 learned via a Type 2 route from PE2. How does PE1 forward this frame to PE2?

   • APE1 sends the frame to PE2 using the BGP next hop, which is the route reflector.
   • BPE1 encapsulates the frame in VXLAN and sends it to PE2's VTEP IP.
   • CPE1 pushes an MPLS label stack that includes the EVPN label advertised by PE2 for that MAC, and forwards the frame to PE2.
   • DPE1 floods the frame to all PEs because MPLS does not support unicast MAC forwarding.
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2. 17foundation · easy

   What information is carried in a BGP EVPN MAC/IP Advertisement route to enable remote PEs to forward traffic to the advertised MAC address?

   • AThe IP address and the MPLS label, but not the MAC address
   • BThe MAC address, the Ethernet tag (VLAN), and the next hop (PE address)
   • CThe MAC address and the local interface index of the advertising PE
   • DThe MAC address and the VXLAN VNI, but not the next hop
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4. 18foundation · easy

   What is the purpose of an Inclusive Multicast Ethernet Tag route (Type 3) in EVPN?

   • ATo advertise the MAC addresses of all hosts in a broadcast domain
   • BTo establish the multicast tunnel or ingress replication list for BUM traffic
   • CTo elect the designated forwarder for a multihomed Ethernet segment
   • DTo advertise IP prefixes for inter-subnet routing
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5. 19expert · hard

   A host moves from PE1 to PE2 in an EVPN-VXLAN fabric. PE2 learns the MAC locally and advertises a Type 2 route with sequence number 1. PE1 still has the MAC in its forwarding table and continues to advertise it with sequence number 0. What will happen to traffic destined to this MAC?

   • ARemote PEs will use both PEs in an active-active load-balancing mode.
   • BRemote PEs will continue to use PE1 because it was the first to advertise the MAC.
   • CRemote PEs will update their MAC tables to point to PE2, and PE1 will eventually withdraw its route.
   • DRemote PEs will drop traffic to this MAC until the conflict is resolved.
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6. 20application · medium

   A data center uses EVPN-VXLAN. A VM sends an ARP request for its default gateway. The gateway MAC is known to all PEs via EVPN. How does the ingress PE handle the ARP request?

   • AThe PE drops the ARP request because ARP is not supported over VXLAN.
   • BThe PE floods the ARP request as BUM traffic to all remote PEs in the broadcast domain.
   • CThe PE sends the ARP request only to the PE that advertised the gateway MAC.
   • DThe PE responds to the ARP request locally because it knows the gateway MAC.
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