Correct: C
DHCP Synchronization
To prevent a scenario in which an IP address is assigned by the primary via DHCP and then that same address is assigned to another client by the secondary after a failover, the DHCP lease table is synchronized regularly between the primary and secondary over UDP port 3483.
https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair
Correct: C
To prevent a scenario in which an IP address is assigned by the primary via DHCP and then that same address is assigned to another client by the secondary after a failover, the DHCP lease table is synchronized regularly between the primary and secondary over UDP port 3483.
Actually stateful firewall database is supported in both mode (Routed mode and Passthrough Mode) but DHCP association database is supported only in Routed mode. Anyways the question says in High Availability pair which is DHCP association make sense.
The question should contains in which mode, if Routed Mode then DHCP association database, if Passthrough Mode then stateful firewall database. Poor question.
C
The MXs in a routed mode high-availability pair exchange DHCP state information over the LAN on UDP port 3483. This prevents a DHCP IP address from being handed out to a client after a failover if it has already been assigned to another client prior to the failover.
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