2V0-21.23 · Question #4
When configuring vCenter High Availability (HA), which two statements are true regarding the active, passive, and witness nodes? (Choose two.)
The correct answer is A. Network latency must be less than 10 milliseconds. D. They must have a minimum of a 1 Gbps network adapter.. vCenter High Availability (HA) requires specific network latency and adapter speed specifications for its active, passive, and witness nodes.
Question
When configuring vCenter High Availability (HA), which two statements are true regarding the active, passive, and witness nodes? (Choose two.)
Options
- ANetwork latency must be less than 10 milliseconds.
- BThey must have a supported Wide Area Network (WAN).
- CThey must have a minimum of a 10 Gbps network adapter.
- DThey must have a minimum of a 1 Gbps network adapter.
- ENetwork latency must be more than 10 milliseconds.
How the community answered
(27 responses)- A93% (25)
- B4% (1)
- E4% (1)
Why each option
vCenter High Availability (HA) requires specific network latency and adapter speed specifications for its active, passive, and witness nodes.
For vCenter HA, the network latency between the active, passive, and witness nodes on the HA network must be 10 milliseconds or less to ensure proper data synchronization and timely failover in the event of an active node failure.
vCenter HA is primarily designed for low-latency LAN environments or stretched Layer 2 networks; it does not require a Wide Area Network (WAN), which often introduces excessive latency that would violate the <10ms requirement.
While 10 Gbps network adapters are recommended for optimal performance with vCenter HA, the minimum requirement for the network adapters is 1 Gbps, making 10 Gbps not the minimum.
The minimum network adapter speed required for the vCenter HA network interfaces on all three nodes (active, passive, witness) is 1 Gbps to support the necessary replication and heartbeat traffic efficiently.
The network latency requirement for vCenter HA is strictly less than or equal to 10 milliseconds, making 'more than 10 milliseconds' an incorrect and disqualifying condition for proper operation.
Concept tested: vCenter High Availability (VCHA) networking requirements
Source: https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-vcenter-ha/GUID-9C49622A-EC3E-4B0D-9E95-6E58F4A14346.html
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