Virtualization—NETWORKING ESSENTIALS—CompTIA A+ (220-1001) A-PLUS Certification Prep Course Notes

VIRTUALIZATION

• Understanding Virtualization
  • Virtual machines are self-contained computers running within a host OS
  • Hypervisors support multiple VMs
  • A type 1 hypervisor runs directly on top of the hardware as an OS
  • A type 2 hypervisor runs as an app in an existing OS

• Your First Virtual Machine
  • Setting up a new VM takes a few steps.
  • Install a hypervisor, like Oracle VirtualBox.
  • Create a virtual machine in the hypervisor.
  • Download & install an operating system, like Ubuntu Linux.

• Advanced VIrtualization
  • You can modify virtual hardware easily, such as add a “drive”.
  • Bridge a VM to connect to same network (and DHCP server) as host OS.
  • Use NAT to put a VM in a unique network ID.
  • Use NAT network to put multiple VMs into a single network ID.

• Cloud Computing
  • Cloud computing moves the VMs “out there”, but accessible via IP.
  • Cloud computing enables rapid elasticity, on-demand scaling, and resource pooling.
  • IaaS moves network tasks such as firewalls into the Cloud.
  • PaaS moves the machines into the Cloud so you can concentrate on apps.
  • SaaS moves apps to the Cloud, such as Google Docs.

• Cloud Ownership
  • Private clouds are owned and used only by a single organization.
  • Public clouds are privately owned but are available for public use.
  • Hybrid clouds have both private & public aspects.
  • Community clouds are owned by multiple organizations for their own private use.

• Cloud-based Applications
  • Cloud storage enables access to synchronized saved files from any device.
  • Cloud-based applications move management to the Cloud or email and more
  • PVirtual desktops provide a consistent workspace in the Cloud accessible from any device.
  • Virtual application streaming provides access to apps without installing them locally.