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Os hypervisors de tipo 1 são aqueles que fazem a interface entre os sistemas operacionais e o hardware. I
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"XenServer is the complete server virtualization platform from Citrix. The XenServer package contains all you need to create and manage a deployment of virtual x86 computers running on Xen, the open-source paravirtualizing hypervisor with near-native performance. XenServer is optimized for both Windows and Linux virtual servers. XenServer runs directly on server hardware without requiring an underlying operating system, which results in an efficient and scalable system. XenServer works by abstracting elements from the physical machine (such as hard drives, resources and ports) and allocating them to the virtual machines running on it"
Como é executado diretamente no hardware do servidor e não precisa de um sistema operacional, Xen é um hipervisor do tipo 1.
GABARITO: B
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Exemplos de hypervisor do tipo I, também chamado de baremetal: Vmware ESXi, Microsoft Hyper-V, XEN, KVM.
Exemplos de hypervisor do tipo II: máquina virtual JAVA ou JVM, oracle virtualbox.
Qualquer erro, me avisem.