An Administrator has deployed a vSphere 5 implementation. Due to security reasons the system state of a virtual machine must be reverted on a regular basis what feature will meet this requirement?
A.
Create the virtual machine using independent-Persistent disks
B.
Create a Scheduled Task using the Delete All Snapshots option according to security requirements
C.
Create the virtual machine using independent-Nonpersistent disks
D.
Create a Scheduled Task using the Delete Snapshot option to delete the most recent snapshot according to security requirements.
Sorry but i think that’s a bad answer. If you using independent-Nonpersistent disks:
Independent – Nonpersistent
Changes to disks in nonpersistent mode are discarded when you power off or reset the virtual machine. With nonpersistent mode, you can restart the virtual machine with a virtual disk in the same state every time. Changes to the disk are written to and read from a redo log file that is deleted when you power off or reset.
But the question explaint that virtual machine must be reverted. So . . . if must be reverted I’m sure that this VM was working until, and some data was store in the virtual disk, not the first time. If the VM has Independent – Nonpersistent virtual disk, don’t need reverted, every time that reboot the VM return to the same state.
Could be “D” option, because if you delete the most recent snapshot returns to first states of VM, and so you revert de VM.
If you delete snapshot then you cannot revert VM – deleting will merge snapshot to VM so it will be permanent. So B and D are wrong.
C is OK, but it will not “revert VM on a regular basis” – just when VM is restarted.
Also, D could not be the answer, there is no ‘delete snapshot’ option under Schedule Task, only ‘create snapshot’.
When a virtual disk is in independent mode, no snapshot
operations are allowed on it. These types of virtual disks are particularly useful for
use with virtual machines in testing and development environments, when you would
need to make changes and test the results, and also want to revert to a standard
base line after the tests. It is also useful when you are using virtual machines to
perform tests that can yield unpredictable results. These kinds of VMs are generally
not backed up.
Non-persistent mode: This mode is generally used in test environments, where changes
can yield unpredictable results.