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Data Center Virtualization

5 minutes 5 Questions

Data Center Virtualization involves consolidating various data center resources like servers, storage, networking, and security into a virtualized environment. This virtualization enables better resource utilization, reduces operational and capital costs, and allows for faster deployment of new ser…

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CompTIA Network+ - Data Center Virtualization Example Questions

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Question 1

In a company's data center, faulty hardware caused a physical host to fail. After the VMware vSphere High Availability (HA) feature restarted the VMs on another host, the VMs continue to have connectivity issues. What should they implement to resolve this?

Correct Answer: vSphere Distributed Switch

The best solution to this problem is to implement a 'vSphere Distributed Switch' (VDS). The VDS provides network connectivity for multiple hosts and handles network traffic at a data center level, offering continuity and consistency. It would help to manage traffic in case of physical host failure, ensuring the VMs experience better connectivity. Implementing 'vSphere Standard Switch', 'Fault Tolerance', or 'Distributed Resource Scheduler' wouldn't directly solve the connectivity issues that occurred after a physical host failure. A vSphere Standard Switch can provide network connectivity to VMs, but it does so at the host level, not the data center level, which wouldn't provide comprehensive redundancy in the case of a host failure. Fault Tolerance provides continuous service by replicating VMs, but wouldn't directly enhance network connectivity. The Distributed Resource Scheduler optimizes resource utilization, but it wouldn't directly address network connectivity issues following a host failure.

Question 2

A virtualization administrator is implementing a new network design for a company's data center. They need to choose a virtual switch that allows VMs to communicate without sending external network traffic. What type of switch should they use?

Correct Answer: Internal Switch

The best type of switch to use in this case would be an Internal Switch. The Internal Switch is designed to allow virtual machines on the same host to communicate with each other, without sending traffic over the external network. This makes it perfect for the given network design. The External Switch allows virtual machines to communicate with the physical network, which isn't required in this scenario. The Private Switch only allows communication between virtual machines on the same host, but also completely isolates all network traffic, which isn't necessary in this case. The Distributed Switch provides network connectivity to multiple hosts in a data center, which exceeds the scope of the requirement.

Question 3

During a network audit, a company discovers numerous VMs experiencing slow network speeds. What can they implement to ensure adequate network resources for high-priority VMs?

Correct Answer: Network QoS

The correct answer is Network QoS (Quality of Service), which is designed to reserve network capacity to prioritize certain types of traffic. This can ensure high-priority VMs get adequate network resources at all times. Network Redundancy improves the availability of network but it does not guarantee improved network speed for certain VMs. VLANs can help establish isolated network environments but they do not directly ensure resource allocation for VMs. Lastly, Link Aggregation combines multiple links into a single larger one for increasing throughput and reliability, however, it can't ensure particular VMs will receive priority network resources.

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