How is high-availability supported for Cisco Meraki devices?

Cisco Meraki supports high availability (HA) for both MX Security Appliances and MS Series Switches through a "warm spare" configuration. This is an active/passive model where a primary device handles traffic and a secondary, identical device remains in a standby state. In the event of a primary device failure, the secondary device assumes the active role. This failover mechanism is managed using the Virtual Router Redundancy Protocol (VRRP), which presents a consistent virtual IP address to the network, ensuring a seamless transition and minimizing downtime.

A. This is incorrect because, in addition to MX Security Appliances, MS Series Switches also support high availability using the same warm spare (VRRP) mechanism.
B. This is incorrect because Meraki MX appliances utilize an active/passive (warm spare) model for high availability, not an active/active configuration.
D. This is incorrect because Meraki devices use the industry-standard Virtual Router Redundancy Protocol (VRRP), not the Cisco-proprietary Hot Standby Router Protocol (HSRP).

1. Cisco Meraki Documentation, "MX Warm Spare and High Availability": This document explicitly states, "The Meraki MX Security Appliance supports a warm spare (high availability) configuration... The two MXs in a high availability pair share a virtual IP address (VRRP)." This confirms the active/passive (warm spare) model and the use of VRRP for MX devices. (Section: "Warm Spare Operation")

2. Cisco Meraki Documentation, "MS Warm Spare (VRRP)": This source confirms HA for switches, stating, "MS series switches can be configured for warm spare (high availability) functionality... MS switches in a warm spare configuration utilize the Virtual Router Redundancy Protocol (VRRP) to provide clients with a consistent gateway IP address." This verifies the active/passive model and VRRP use for MS switches. (Section: "Overview")