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Do I not need a default deny firewall rule to block WAN traffic?

I have much experience with other firewalls, specifically Sonicwall appliances. With those devices, I will typically have a default deny rule like this:

Is this not necessary in a UTM 9? Everything seems to work fine with only a NAT rule, it just seemed odd to me. Is all traffic blocked unless otherwise configured, I.E. it wouldn't know what to do with that traffic?

Thanks!

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