Overlay Versus Underlay Networks JN0-281 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   What is the primary characteristic of an overlay network in a data center?

   • AIt is a network that uses only Layer 2 switching without any tunneling.
   • BIt is the physical infrastructure of switches and routers that provides connectivity.
   • CIt is a virtual network that uses encapsulation to create logical paths over a physical network.
   • DIt is a network that operates without any underlying physical infrastructure.
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2. 12application · medium

   A managed service provider is offering virtual data centers to multiple customers. Each customer needs to have isolated networks that can be customized independently. The provider wants to maximize the use of the physical infrastructure. Which feature of overlay networks is most beneficial in this scenario?

   • AElimination of the need for IP addressing in the physical network.
   • BThe ability to increase the physical bandwidth of the underlay on demand.
   • CSupport for multiple isolated virtual networks over a shared physical underlay.
   • DGuaranteed bandwidth for each customer regardless of the underlay's capacity.
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4. 13application · medium

   A large enterprise is deploying a private cloud. They need to provide self-service network provisioning for development teams, allowing each team to create isolated networks with overlapping IP addresses. Which technology is best suited for this use case?

   • AA single flat network with DHCP to dynamically assign IP addresses to all teams.
   • BStatic routing with per-team routing tables on the core routers.
   • CVXLAN overlay networks, which allow multiple isolated virtual networks with overlapping IP spaces over a shared underlay.
   • DTraditional VLANs, which provide simple Layer 2 segmentation for each development team.
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5. 14foundation · easy

   Why must an underlay network support IP routing?

   • ATo enable VLAN tagging between switches.
   • BTo replace the need for MAC addressing.
   • CTo provide application-level load balancing.
   • DTo forward encapsulated overlay packets between endpoints.
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6. 15application · medium

   A cloud provider is implementing network virtualization to support a new container platform. The platform requires each container to have its own IP address and the ability to communicate across multiple hosts. The provider wants to avoid changing the physical network. Which approach is most appropriate?

   • AUse NAT on each host to translate container IPs to the physical network.
   • BUse an overlay network, such as VXLAN, to provide virtual networks for the containers over the existing physical underlay.
   • CConnect all container hosts with a dedicated Layer 2 switch to create a flat network.
   • DAssign each container an IP from the physical network's subnet and rely on the existing VLANs.
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