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How many vManage NMSs should be installed in each domain to achieve scalability and redundancy?
Correct Answer: D
vManage NMS Redundancy A highly available Cisco SD-WAN network contains three or more vManage NMSs in each domain. This scenario is referred to as a cluster of vManage NMSs, and each vManage NMS in a cluster is referred to as a vManage instance. Each vManage instance or device in a cluster can manage approximately 2000 devices, so a cluster of three vManage devices can manage up to 6000 devices. The vManage devices automatically load-balances the devices that they manage. With three devices, the vManage cluster remains operational if one of the devices in that cluster fail. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/optimization- ha/vedge/network-optimization-high-availability-book/high-availability.html