Exam 5V0-21.19 topic 1 question 54 discussion

A is correct. If communication is lost for five consecutive heartbeats between the witness host and the data sites, then the witness has failed. Virtual machines continue to run without interruption as the two data sites continue to have a qourum.

The Role of vSAN Heartbeats - from VSAN STRETCHED CLUSTER GUIDE page 43-44 The vSAN Primary Node and the vSAN Backup Node send heartbeats every second. If communication is lost for 5 consecutive heartbeats (5 seconds) between the primary node and the Backup due to an issue with the Backup node, the primary node chooses a different ESXi host as a Backup on the remote site. This is repeated until all hosts on the remote site are checked. Ifthere is a complete site failure, the primary node selects a Backup node from the Preferred Site. A similar scenario arises when the primary node has a failure.

I think A is correct. non-preferred is isolated when any host on that site (backup node) is unable to communicate with master node in prefered site.

The vSAN Master Node and the vSAN Backup Node send heartbeats every second. If communication is lost for 5 consecutive heartbeats (5 seconds) between the Master and the Backup due to an issue with the Backup node, the Master chooses a different ESXi host as a Backup on the remote site. This is repeated until all hosts on the remote site are checked. If there is a complete site failure, the Master selects a Backup node from the Preferred Site.

A is the correct answer

I guess A is the right Answer.