MAC Learning JN0-683 Practice Questions (Page 4)

Questions 16–19

1. 16foundation · easy

   In an EVPN-VXLAN fabric, what is the primary purpose of the MAC-VRF?

   • AIt provides a separate routing table for inter-VXLAN routing.
   • BIt maintains the MAC address table and associated forwarding information for a given VXLAN network identifier (VNI).
   • CIt filters duplicate MAC addresses before they are advertised.
   • DIt stores the BGP EVPN routes for all VNIs in the fabric.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   In EVPN-VXLAN, what is the purpose of the duplicate MAC detection timer?

   • AIt defines the period during which the VTEP collects MAC mobility events before declaring a duplicate MAC address.
   • BIt specifies how long a MAC address must be inactive before it is removed from the MAC-VRF.
   • CIt controls the rate at which Type 2 routes are sent to remote VTEPs.
   • DIt sets the interval at which the VTEP sends BGP keepalive messages to the route reflector.
   Reveal Solution Discussion Select an answer first
4. 18application · medium

   A VM with MAC address 00:11:22:33:44:55 was originally learned on leaf-1. After a live migration, the same MAC is now learned on leaf-2. The engineer observes that leaf-1 still has the old MAC entry and traffic is intermittently black-holing. What is the most likely cause?

   • AThe VXLAN VNI is misconfigured on leaf-2
   • BThe MAC mobility extended community is missing or the sequence number is not incrementing
   • CThe MAC address is not in the MAC-VRF on leaf-2
   • DThe duplicate MAC detection timer is too short
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A data center engineer is designing an EVPN-VXLAN fabric with multiple VTEPs. The engineer wants to ensure that when a host moves from one VTEP to another, the MAC address is updated quickly across the fabric. The engineer also wants to minimize the risk of transient loops during the move. What is the best approach?

   • AEnable duplicate MAC detection with a low threshold to suppress the old entry
   • BDisable MAC mobility and use static MAC entries on all VTEPs
   • CUse a shorter MAC aging timer to flush old entries quickly
   • DEnable MAC mobility with sequence numbers and rely on BGP convergence to update all VTEPs
   Reveal Solution Discussion Select an answer first