Virtualization

Device virtualization, data path virtualization, and network virtualization technologies.

5 minutes 5 Questions

Virtualization in CCNP Enterprise (ENCOR) refers to the technology that abstracts physical IT resources—such as servers, storage, and network infrastructure—into logical, software-defined components. This allows organizations to run multiple virtual instances on a single physical device, maximizing…

Concepts covered
Virtual SwitchingHypervisor Type 1 and Type 2Virtual MachinesVRF (Virtual Routing and Forwarding)GRE and IPsec TunnelingLISP (Locator/ID Separation Protocol)VXLAN (Virtual Extensible LAN)
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ENCOR 350-401 - Virtualization Example Questions

Test your knowledge of Virtualization

Question 1

What is the term for the software layer that allows multiple virtual machines to run on a single physical server by abstracting hardware resources?

Correct Answer: Hypervisor

A hypervisor is the software layer that abstracts physical hardware resources such as CPU, memory, storage, and networking, enabling multiple virtual machines to run independently on a single physical server.

A virtual switch is a networking component within the virtualization environment that handles Layer 2 traffic between VMs, not the full abstraction layer. A container engine, such as Docker, manages lightweight containers that share the host OS kernel rather than virtualizing entire hardware. A resource orchestrator, such as Kubernetes or vCenter, manages and automates the deployment and scaling of workloads but does not itself provide the hardware abstraction.

Key concept tested: understanding server virtualization fundamentals and the role of the hypervisor.

Question 2

A junior engineer is told to check which VRF a router interface belongs to. The engineer runs 'show ip route' and sees no routes for the interface's subnet. The interface is up/up with an IP address assigned. What is the most likely reason the subnet does not appear in the output?

Correct Answer: The interface is assigned to a VRF, so its route exists in that VRF's routing table instead of the global table

When an interface is assigned to a VRF, its connected route is automatically placed into that VRF's separate routing table, not the global routing table, which is why 'show ip route' (which displays the global table) does not show the subnet. To view routes in a specific VRF, the engineer should use 'show ip route vrf '.

A static route is not required to make the connected route appear; it exists automatically in the VRF table. Connected routes populate immediately in the VRF table without needing a routing protocol. The Route Distinguisher does not cause a pending state for connected routes; it is used for BGP route identification in MPLS VPN environments.

Key concept tested: VRF route table isolation from the global routing table.

Question 3

Which of the following is an example of a Type 1 hypervisor?

Correct Answer: VMware ESXi

VMware ESXi is a Type 1 (bare-metal) hypervisor because it runs directly on the physical hardware without requiring an underlying host operating system, providing direct access to hardware resources for virtual machines.

VMware Workstation Pro is a Type 2 hypervisor that runs on top of a Windows or Linux host OS. Oracle VirtualBox is also a Type 2 hypervisor that requires a host operating system. VMware Fusion is a Type 2 hypervisor designed to run on top of macOS.

The key concept tested is the distinction between Type 1 (bare-metal) and Type 2 (hosted) hypervisors in server virtualization.

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