Overlay Versus Underlay Networks JN0-281 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is the primary role of an underlay network in a data center?

   • ATo create virtual networks using encapsulation.
   • BTo provide physical connectivity and transport for overlay networks.
   • CTo replace the need for IP routing in the data center.
   • DTo provide application-level services such as load balancing.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   Which statement correctly describes how an overlay network operates?

   • AIt replaces the physical network entirely, eliminating the need for switches and routers.
   • BIt operates only at Layer 1, directly using physical cables.
   • CIt requires a dedicated physical network separate from the underlay.
   • DIt relies on the physical network to forward encapsulated packets between virtual endpoints.
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   In which scenario is an overlay network most appropriate?

   • AA high-performance computing cluster requiring maximum bandwidth with minimal overhead.
   • BA network that requires only Layer 2 connectivity within a single rack.
   • CA small office with a single switch and no virtualization.
   • DA virtualized data center with many tenants requiring isolated virtual networks.
   Reveal Solution Discussion Select an answer first
5. 19expert · hard

   A network architect is designing a data center for a financial institution. The design must support a mix of high-performance trading applications (sensitive to latency) and a virtualized environment with many tenants. The architect is considering whether to use a single converged underlay or separate underlays. What is the most important trade-off to consider?

   • AA converged underlay simplifies operations but may introduce latency and contention for the latency-sensitive trading traffic.
   • BSeparate underlays are required because VXLAN cannot run on the same physical network as traditional traffic.
   • CSeparate underlays eliminate the need for encapsulation, reducing overhead for all workloads.
   • DA converged underlay is always more cost-effective and should be used regardless of the workload mix.
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   Which components are typically part of an underlay network?

   • APhysical switches, routers, and links.
   • BVirtual switches and logical tunnels.
   • CApplication servers and storage arrays.
   • DFirewalls and load balancers only.
   Reveal Solution Discussion Select an answer first