EVPN Traffic Flow and MAC Learning/distribution JN0-664 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   In EVPN over MPLS, what is used to forward unicast traffic to the correct remote PE?

   • AThe frame is sent without any label
   • BThe destination IP address is used to look up the MPLS label
   • CThe VXLAN VNI is used to determine the MPLS label
   • DThe destination MAC address is mapped to an MPLS label
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   In an EVPN environment, how does a PE device learn MAC addresses for locally attached hosts?

   • ABy receiving BGP EVPN MAC/IP Advertisement routes from remote PEs
   • BBy using LLDP to discover neighboring devices and their MAC addresses
   • CBy inspecting the source MAC address of data frames received on its local Ethernet interfaces
   • DBy querying the DNS server for MAC-to-IP mappings
   Reveal Solution Discussion Select an answer first
4. 13expert · hard

   An EVPN-VXLAN fabric uses ingress replication for BUM traffic. A CE is dual-homed to PE1 and PE2. The designated forwarder (DF) for the Ethernet segment is PE1. A broadcast frame arrives at both PE1 and PE2 from the CE. What happens to the frame on PE2?

   • APE2 forwards the frame only to PE1, which then forwards it to remote PEs.
   • BPE2 drops the frame and does not forward it to remote PEs.
   • CPE2 forwards the frame to remote PEs, and remote PEs use the sequence number to drop duplicates.
   • DPE2 forwards the frame to remote PEs, and remote PEs drop duplicates based on the VXLAN VNI.
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   How does a PE device learn MAC addresses for hosts that are attached to a remote PE in an EVPN network?

   • ABy sending ARP requests to the remote PE over the core network
   • BBy using the VXLAN VTEP to learn MAC addresses from encapsulated frames
   • CBy flooding unknown unicast frames across the core until the remote PE responds
   • DBy receiving BGP EVPN MAC/IP Advertisement routes from the remote PE
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   In an EVPN-VXLAN fabric, PE1 receives an IP packet from a local host destined to a remote host behind PE2. PE1 has already learned the remote host's MAC address via BGP. How does PE1 forward this packet?

   • APE1 looks up the destination MAC in its MAC table, finds the associated VTEP, encapsulates the packet in VXLAN with the outer destination IP set to the remote VTEP, and sends it.
   • BPE1 sends the packet to the route reflector, which then forwards it to PE2.
   • CPE1 encapsulates the packet in MPLS and sends it to PE2 using a label advertised in the Type 2 route.
   • DPE1 floods the packet to all remote PEs because it does not know the destination MAC.
   Reveal Solution Discussion Select an answer first