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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 services. Data Center Virtualization typically includes server virtualization, storage virtualization, and network virtualization. It also covers other aspects like energy efficiency, security, and scalability. Data Center Virtualization technologies enable organizations to achieve optimal resource utilization, enhanced flexibility, and easier management of the infrastructure.

Guide: Data Center Virtualization for CompTIA Network+ Exam

What is Data Center Virtualization?
Data Center Virtualization is a process which involves the creation of a virtual version of a physical data center. It includes the abstraction of the various components like servers, storage devices, networks, etc. and allows multiple virtual environments to exist on a single physical environment.

Importance of Data Center Virtualization
Data Center Virtualization is important because it improves efficiency, reduces costs, allows quick deployment of resources and increases scalability. It is vital for cloud computing as it creates the foundation for the cloud.

How it Works
Virtualization operates by using a software, known as hypervisor, to divide one physical server into multiple isolated virtual environments. These environments are known as virtual machines that can run their own operating systems and applications just like a physical server.

Exam Tips: Answering Questions on Data Center Virtualization
1. Understand the basic concepts: Make sure you know what data center virtualization is and why it is important. Be sure to understand how it operates too.
2. Apply knowledge: Exams often test application of knowledge. Be ready to handle questions that require you to apply your understanding of Data Center Virtualization.
3. Review virtualization software: Knowing the different types of hypervisors and virtualization software can be very useful.
4. Key features: Be familiar with the key features of Data Center Virtualization such as its scalability, load balancing and disaster recovery.
5. Common pitfalls: Avoid common misconceptions about Data Center Virtualization. For instance, understand that it doesn't eliminate the need for physical hardware completely.
6. Use Exam Terminology: Understand and use the terminology related to Data Center Virtualization in your answers.

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CompTIA Network+ - Virtualization and Cloud Computing 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

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.

Question 3

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.

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