Which of the following options is the protocol number of GRE?

ASPF(Application Specific Packet Filter) is a packet filtering technology based on the application layer and is passed throughserver-mapTables implement special security mechanisms.
aboutASPFandserver-mapWhich of the following statements is correct? (multiple choice)

After the firewall uses the hrp standby config enable command to enable the standby device configuration function, all the information that can be backed up can be directly configured on the standby device, and the configuration on the standby device can be synchronized to the active device

Which of the following VPNs cannot be used in site-to-Site scenarios?

existL2TPconfiguration, for the commandTunnel Name, which of the following statements is true? (multiple choice)