VCA vSphere vMotion & Live Migration 2 — Questions and Answers
Question 1: What is Enhanced vMotion Compatibility (EVC) used for?
- To increase vMotion network throughput
- To enable vMotion between hosts with different CPU generations by masking advanced CPU features (Correct answer)
- To allow vMotion across different data centers
- To automatically schedule vMotion operations during off-peak hours
Correct answer: To enable vMotion between hosts with different CPU generations by masking advanced CPU features
EVC masks newer CPU features at the cluster level so that all hosts present a common baseline CPU feature set, enabling vMotion between hosts with different CPU generations.
Question 2: What is Cross-vCenter vMotion?
- vMotion between virtual machines on the same host
- Migration of a VM between ESXi hosts managed by different vCenter Server instances (Correct answer)
- vMotion that crosses VLAN boundaries automatically
- Migrating a VM from vCenter to a standalone ESXi host
Correct answer: Migration of a VM between ESXi hosts managed by different vCenter Server instances
Cross-vCenter vMotion allows live migration of virtual machines between ESXi hosts that are managed by separate vCenter Server instances, even across different SSO domains.
Question 3: What is the difference between vMotion and Cold Migration?
- vMotion moves disk files while Cold Migration moves the compute state
- vMotion migrates a running (powered-on) VM; Cold Migration migrates a powered-off VM (Correct answer)
- vMotion requires shared storage; Cold Migration does not require any storage
- vMotion is used only for templates; Cold Migration is used for live VMs
Correct answer: vMotion migrates a running (powered-on) VM; Cold Migration migrates a powered-off VM
vMotion performs live migration of a powered-on VM with zero downtime, while Cold Migration moves a powered-off (or suspended) VM, resulting in some downtime.
Question 4: How many simultaneous vMotion migrations are supported per ESXi host with a 1 Gbps vMotion network?
- 1
- 2
- 4
- 8 (Correct answer)
Correct answer: 8
With a 1 Gbps vMotion network, ESXi supports up to 8 concurrent vMotion operations per host, though VMware recommends limiting concurrent migrations to avoid performance impacts.
Question 5: Which TCP port does vMotion use by default for data transfer?
- 443
- 902
- 8000 (Correct answer)
- 8123
Correct answer: 8000
vMotion data transfer uses TCP port 8000 by default on the vMotion VMkernel network for transmitting memory and device state between hosts.
Question 6: During a vMotion, what is transferred from the source host to the destination host?
- Only the VM's configuration file (.vmx)
- The VM's active memory state and CPU execution context (Correct answer)
- The VM's disk files (VMDKs) and snapshots
- The VM's network adapter MAC address and IP routing table
Correct answer: The VM's active memory state and CPU execution context
vMotion copies the VM's active memory pages and CPU execution context (registers, device state) to the destination host, enabling the VM to resume execution seamlessly.
Question 7: Which vSphere feature automates vMotion migrations based on cluster resource utilization?
- vSphere High Availability (HA)
- vSphere Fault Tolerance (FT)
- vSphere Distributed Resource Scheduler (DRS) (Correct answer)
- vSphere Replication
Correct answer: vSphere Distributed Resource Scheduler (DRS)
DRS monitors cluster resource utilization and automatically initiates vMotion migrations to balance workloads across hosts according to configured automation levels.
VCA vSphere vMotion & Live Migration 2
What is Enhanced vMotion Compatibility (EVC) used for?