When troubleshooting packet handling on an SRX Series device, administrators need to understand exactly how the flow module is processing traffic. The most effective tool for this is the flow traceoptions feature.
Flow traceoptions: Provides detailed per-packet trace information showing each processing step within the flow module. It reveals how traffic is evaluated against session tables, NAT rules, and security policies. This is the recommended method for in-depth troubleshooting.
Why not the others?
The flow session table (Option A) shows only active sessions and counters, not detailed step-by-step handling.
The forwarding table (Option B) relates to routing and forwarding decisions, not flow security processing.
Firewall filters (Option D) can match and log traffic but do not display detailed flow processing steps.
Therefore, the correct method to get detailed information about flow handling is to enable flow traceoptions.

Global policies (Option D): Evaluated before zone-based policies. They allow centralized control and can apply across all zones. Perfect for Internet-to-private traffic that must be enforced before other rules.
Routing policy (Option A): Controls routing decisions, not traffic forwarding/security.
Default policy (Option B): Denies all traffic by default, but cannot be customized for early evaluation.
Zone policy (Option C): Zone-based policies apply after global policies and are limited to specific zone pairs.
Correct Policy Type: Global policy

In the JNCIA-SEC SRX security policy context, standard security policies control transit traffic passing through the firewall. They are not the normal mechanism for permitting management or protocol traffic destined to the SRX itself; that type of self or exception traffic is controlled with host-inbound-traffic settings. Security policies can be configured between different zones, which is inter-zone policy, or within the same zone, which is intra-zone policy. Therefore, option C is correct because policies can apply to both intra-zone and inter-zone flows. Option D is correct in the standard SRX policy model because security policies are used to control traffic transiting the firewall. Options A and B are not correct for this topic scope.

Static NAT is bidirectional on SRX Series Firewalls. It creates a fixed one-to-one translation between an original address and a translated address, allowing sessions to be initiated from either side of the gateway. Destination NAT, by contrast, allows inbound access to internal resources but is not inherently bidirectional in the same way. Source NAT translates the source address for outbound connections, commonly allowing private hosts to access public networks, and return traffic is handled by the session table. Source NAT without PAT still does not provide the automatic reverse mapping behavior of static NAT. Juniper documentation notes that static NAT mappings allow connections to be established from either side, which makes static NAT the correct answer.