EVPN Traffic Flow and MAC Learning/distribution JN0-664 Practice Questions (Page 7)

Questions 31–33

1. 31foundation · easy

   What is the purpose of duplicate MAC detection in EVPN?

   • ATo prevent forwarding loops caused by a MAC address flapping between PEs
   • BTo ensure that each MAC address is assigned a unique IP address
   • CTo speed up MAC learning on remote PEs
   • DTo prevent MAC address spoofing by hosts
   Reveal Solution Discussion Select an answer first
2. 32expert · hard

   An EVPN-MPLS network has a CE dual-homed to PE1 and PE2. The CE sends a broadcast frame. Both PEs receive the frame. To prevent duplicate frames from being forwarded to the remote PEs, what mechanism is used?

   • AThe designated forwarder (DF) election ensures that only one PE forwards BUM traffic from the Ethernet segment to the remote PEs.
   • BThe PEs use a multicast tunnel to send the frame, and only the PE that owns the multicast group forwards it.
   • CThe CE is configured to send the broadcast only to the PE with the higher IP address.
   • DBoth PEs forward the frame, and the remote PEs drop duplicates based on the sequence number in the VXLAN header.
   Reveal Solution Discussion Select an answer first
3. 33foundation · easy

   In EVPN, what mechanism is used to handle MAC mobility when a host moves from one PE to another?

   • AMAC address aging timers
   • BMAC sequence numbers in BGP EVPN routes
   • CDuplicate MAC detection using ARP
   • DSTP topology change notifications
   Reveal Solution Discussion Select an answer first