MAC Learning JN0-683 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What happens to a remote MAC address entry in a VTEP's MAC-VRF when the aging timer expires?

   • AThe VTEP sends a BGP route refresh to the originating VTEP to confirm the MAC is still active.
   • BThe entry is removed from the forwarding table, and the VTEP must re-learn the MAC address via BGP EVPN or data plane flooding.
   • CThe entry is marked as stale and kept in the table until the next BGP refresh.
   • DThe VTEP sends a BGP withdraw for the Type 2 route to all remote VTEPs.
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   In EVPN-VXLAN, what is the purpose of the MAC mobility extended community attached to a Type 2 route?

   • AIt carries the sequence number used to resolve conflicting advertisements for the same MAC address.
   • BIt specifies the lifetime of the MAC address in the forwarding table.
   • CIt identifies the VTEP that originally learned the MAC address.
   • DIt indicates the VNI to which the MAC address belongs.
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   An engineer is troubleshooting a MAC table issue in an EVPN-VXLAN fabric. A remote MAC address is not being flushed from the MAC table even after the host has been disconnected for several hours. The engineer suspects that the BGP session is still up. What is the most likely cause?

   • AThe MAC aging timer on the local VTEP is set to infinity
   • BThe remote VTEP is still advertising the MAC address because it has not detected the host's disconnection
   • CThe MAC-VRF is configured with 'no-mac-learning'
   • DThe duplicate MAC detection timer is preventing the flush
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   A network engineer is troubleshooting a MAC mobility event in an EVPN-VXLAN fabric. A host moved from leaf-1 to leaf-2, and the MAC mobility extended community sequence number was incremented. However, some remote VTEPs are still sending traffic to leaf-1. What is the most likely reason?

   • AThe duplicate MAC detection timer is too short
   • BThe MAC mobility extended community is not supported on the remote VTEPs
   • CThe MAC aging timer on the remote VTEPs is too long
   • DThe remote VTEPs have not yet received the updated Type-2 route with the higher sequence number
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   An engineer is configuring an EVPN-VXLAN fabric and wants to ensure that when a host moves to a different VTEP, the old MAC entry is removed from the fabric. What is the correct mechanism?

   • AThe new VTEP advertises a Type-2 route with a higher sequence number, and the old VTEP withdraws its route
   • BThe old VTEP manually flushes the MAC entry when it detects the host is gone
   • CThe MAC aging timer expires on the old VTEP and removes the entry
   • DThe duplicate MAC detection timer triggers a flush of the old entry
   Reveal Solution Discussion Select an answer first