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Security VLAN for SSN inside the FW and for outside FW

I have an SSN (inside FW) and a VLAN outside FW.I am concerned about VLAN hopping. I am using Checkpoint FW. I do not assign VLAN 1 to any port of my external siwtches. I do not have SNMP runnin gon my external switches. What configure pratices do I have to check I have to follow? Is there any best pratices?

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