By default, each ESXi 6.x host is provisioned with a certificate from which root certificate authority?

Correct Answer: B 🗳️
In vSphere 6.0 and later, the VMware Certificate Authority (VMCA) provisions your environment with certificates. This includes machine SSL certificates for secure connections, solution user certificates for authentication to vCenter Single Sign-On, and certificates for ESX hosts that are added to vCenter Server.

Reference -
https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.security.doc%2FGUID-3AF7757E-A30E-4EEC-8A41-
28DA72102520.html

Which vSphere 6 Enterprise Edition feature will allow an organization to ensure that critical multi-threaded applications have the maximum possible uptime?

Correct Answer: B 🗳️
High availability is a permanent feature of vSphere 6 Enterprise edition and it allows critical multi-threaded applications to get maximum possible uptime.

Reference -
http://www.vladan.fr/how-to-configure-vmware-high-availability-ha-cluster/

Which vSphere 6 Standard Edition feature will allow an organization to ensure that critical multi-threaded applications have the maximum possible uptime?

Correct Answer: B 🗳️
High availability is a permanent feature of vSphere 6 standard edition and it allows critical multi-threaded applications to get maximum possible uptime.

Which vSphere 6.x feature will allow an organization to utilize native snapshots?

Correct Answer: A 🗳️
Virtual Volumes has the following characteristics:
✑ Virtual Volumes supports offloading a number of operations to storage hardware. These operations include snapshotting, cloning, and Storage DRS.
✑ With Virtual Volumes, you can use advanced storage services that include replication, encryption, deduplication, and compression on individual virtual disks.
✑ Virtual Volumes supports such vSphere features as vMotion, Storage vMotion, snapshots, linked clones, Flash Read Cache, and DRS.
✑ With Virtual Volumes, storage vendors can use native snapshot facilities to improve performance of vSphere snapshots.
✑ You can use Virtual Volumes with storage arrays that support vSphere APIs for Array Integration (VAAI).
✑ Virtual Volumes supports backup software that uses vSphere APIs for Data Protection (VADP).

Reference -
https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2113013