EVPN Traffic Flow and MAC Learning/distribution JN0-664 Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   In an EVPN-VXLAN environment, what information does the ingress VTEP use to determine the destination VTEP for a unicast frame?

   • AThe destination MAC address looked up in the MAC table, which points to the remote VTEP
   • BThe destination IP address looked up in the routing table
   • CThe VXLAN VNI alone, which identifies the destination VTEP
   • DThe multicast group associated with the VNI
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   What happens when a PE learns a new MAC address locally?

   • AIt updates its local MAC table but does not inform other PEs
   • BIt immediately sends an ARP broadcast to inform other PEs
   • CIt waits for the next periodic update to send the MAC
   • DIt advertises the MAC address in a BGP EVPN route to all other PEs
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   An EVPN-VXLAN fabric uses ingress replication for BUM traffic. A broadcast frame arrives at PE1 from a local CE. PE1 must forward this frame to all remote PEs that have at least one local host in the same broadcast domain. How does PE1 handle this frame?

   • APE1 encapsulates the frame in VXLAN and sends a copy to each remote PE's VTEP IP address.
   • BPE1 drops the frame because broadcast frames are not allowed in EVPN.
   • CPE1 sends the frame to a multicast group, and all PEs in the group receive it.
   • DPE1 sends the frame only to the PE that is the designated forwarder for the Ethernet segment.
   Reveal Solution Discussion Select an answer first
5. 29expert · hard

   An EVPN-VXLAN fabric has a misconfigured host that is sending frames with a source MAC address that is already known to be behind PE1. PE2 receives a frame from this host and learns the MAC locally. PE2 then advertises a Type 2 route for the MAC with sequence number 0. PE1 also advertises the same MAC with sequence number 0. What is the result?

   • ABoth PEs continue to advertise the MAC, and remote PEs may see flapping or choose one arbitrarily, potentially causing a loop.
   • BPE1 increments its sequence number to 1, and PE2 withdraws its route.
   • CThe EVPN instance is shut down to prevent a loop.
   • DPE2 wins because it has a higher IP address, and PE1 withdraws its route.
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A network engineer is troubleshooting an EVPN-MPLS deployment where two PEs are not learning each other's MAC addresses. Both PEs have established BGP sessions and the EVPN address family is configured. Which configuration element is most likely to be missing?

   • AThe route-target configuration for the EVPN instance is not matching between the PEs.
   • BThe VXLAN encapsulation is not enabled on the PEs.
   • CThe MAC learning is disabled on the CE devices.
   • DThe PEs are not configured with the same EVPN instance name.
   Reveal Solution Discussion Select an answer first