When deploying dual-machine hot backup on the firewall, which of the following protocols needs to be used to achieve overall status switching of the VRRP backup group?

When deploying dual-machine hot backup on the firewall, which of the following protocols needs to be used to achieve overall status switching of the VRRP backup group?
A . VRRP
B . VGMP
C . HRP
D . OSPF

Answer: B

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