Without any configuration , by default all the revenue ports are in null zone . If you have factory default config then you will have them all in trusted zone . You can change them later as per your requirment .
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The SRX is a locked-down device. You can’t even ping an interface on the SRX initially, even if it has a valid IP address. The SRX uses the concept of nested security zones. Zones are a critical concept in SRX configuration. No traffic goes in or out unless the security zones are configured properly on the SRX interfaces.