2.3 Describe Network Virtualization Concepts 350-401 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A company is implementing LISP to support network virtualization. The network team wants to ensure that when a host sends traffic to a destination EID, the xTR can forward the packet even if the destination is not in the local map-cache. What should the xTR be configured to do?

   • AEncapsulate the packet to the Map Server.
   • BSend a map-request to the Map Resolver and buffer the packet until a map-reply is received.
   • CForward the packet to the default gateway in the underlay.
   • DDrop the packet and send an ICMP unreachable message.
   Reveal Solution Discussion Select an answer first
2. 12expert · hard

   A data center operator is designing a VXLAN fabric with a spine-and-leaf topology. The operator wants to minimize the use of IP multicast in the underlay while still supporting broadcast, unknown unicast, and multicast (BUM) traffic. The fabric has a small number of VTEPs (fewer than 10). Which approach best meets the requirement?

   • AEnable head-end replication on each VTEP for the VNI.
   • BConfigure a multicast group for each VNI and use PIM in the underlay.
   • CUse a centralized controller to replicate BUM traffic.
   • DDisable BUM traffic and rely only on unicast.
   Reveal Solution Discussion Select an answer first
4. 13foundation · easy

   What is the purpose of the LISP mapping database?

   • AIt stores the authentication keys used to secure LISP control messages between xTRs.
   • BIt records the MAC addresses of all hosts in the LISP site to support Layer 2 forwarding.
   • CIt maintains a list of all EIDs and their associated RLOCs, allowing LISP devices to resolve endpoint identifiers to routing locators.
   • DIt stores the routing table entries for the underlying IP network that connects LISP sites.
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   In VXLAN, what is the purpose of the VXLAN Network Identifier (VNI)?

   • AIt identifies the VXLAN tunnel endpoint (VTEP) that encapsulates and decapsulates the traffic.
   • BIt is used as the UDP destination port number for VXLAN encapsulation.
   • CIt uniquely identifies a Layer 2 segment within the VXLAN overlay, allowing multiple isolated networks to share the same underlying IP fabric.
   • DIt specifies the multicast group address used for BUM traffic within the VXLAN segment.
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6. 15foundation · easy

   In the Locator/ID Separation Protocol (LISP), what is the primary role of an ingress tunnel router (ITR) when it receives a packet from a host in its site?

   • AIt encapsulates the packet with the destination host's EID as the outer destination address and forwards it to the destination site's xTR.
   • BIt looks up the destination EID in the mapping database and encapsulates the packet with the destination site's ETR RLOC as the outer destination address.
   • CIt maintains the mapping database and responds to map-request messages from other LISP devices.
   • DIt decapsulates the packet and forwards it to the local host based on the inner destination EID.
   Reveal Solution Discussion Select an answer first