Overlay Versus Underlay Networks JN0-281 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   How does an overlay network improve flexibility in a data center?

   • AIt decouples virtual networks from the physical topology, allowing workloads to move without changing the network.
   • BIt forces all traffic to traverse a single central gateway.
   • CIt requires all virtual machines to be on the same physical switch.
   • DIt eliminates the need for IP routing in the data center.
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2. 2foundation · easy

   Which use case is best suited for an underlay network?

   • AProviding physical connectivity for high-performance computing clusters.
   • BProviding software-defined networking overlays.
   • CEnabling virtual machine mobility across data centers.
   • DCreating isolated virtual networks for cloud tenants.
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4. 3application · medium

   A network administrator is configuring VXLAN on a pair of leaf switches. The administrator wants to verify that the VTEPs can communicate and that the overlay is functioning. Which action is the most direct way to test the VXLAN overlay?

   • AVerify the VXLAN VNI is configured on the spine switches.
   • BPing the remote VTEP's IP address from the local VTEP to verify underlay connectivity.
   • CPing a VM's IP address in the same VXLAN segment from another VM in the same segment on a different leaf.
   • DCheck the VLAN configuration on the access ports to ensure the VMs are in the correct VLAN.
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5. 4expert · hard

   A network architect is comparing overlay and underlay networks for a new data center. The design must support both traditional physical server connectivity and a virtualized environment with VXLAN. The architect is concerned about the additional overhead of encapsulation. What is the most effective way to mitigate the impact of VXLAN overhead on the underlay?

   • AConfigure the spine switches to terminate the VXLAN tunnels to reduce the path length.
   • BDisable TCP segmentation offload on the physical NICs to reduce CPU overhead.
   • CIncrease the MTU on the underlay interfaces to accommodate the VXLAN encapsulation overhead.
   • DUse a dedicated physical network for VXLAN traffic to avoid impacting traditional traffic.
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6. 5foundation · easy

   Which protocol is commonly used for encapsulation in overlay networks?

   • AVXLAN
   • BOSPF
   • CSTP
   • DBGP
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