Juniper JN0-232 Exam With Confidence Using Practice Dumps

Source NAT (Network Address Translation) is used on SRX devices to allow hosts with private IP addresses to access external networks, such as the Internet. The SRX translates theprivate IP address of the source host into a public IP addressbefore forwarding traffic toward the destination.

It does not translate MAC addresses (Option A).

NAT is unidirectional in this case: it specifically translates private-to-public in the outbound direction, while the reverse (return traffic) is handled automatically through the session table. It is not a bidirectional translation (Option C).

NAT processing occurs as part of the flow module, not limited only to ingress traffic (Option D).

Therefore, the correct statement is that source NAT translatesprivate IP addresses to public IP addresses.

On high-end SRX platforms, control-plane (Routing Engine–destined) traffic transits the loopback (lo0) and is best captured by applying afirewall filter on lo0 with the then sample action, together withtraffic samplingunder forwarding-options to write packets to a file.

sample sends matched control-plane packets to the sampling process, which can record them for analysis.

datapath-debug capture focuses on data-plane/SPC paths and is not the tool for generic control-plane packet capture.

tcpdump from shell is not the supported workflow on SRX; the operational command is monitor traffic, but forhigh-endcontrol-plane capture, the recommended and scalable method islo0 filter + sampling.

Port mirroring mirrors transit data-plane traffic, not RE-destined control-plane packets.

In Junos OS, security zones are the foundation of SRX firewall policy enforcement. Logical interfaces must be assigned to zones. This enables:

Separation of traffic by zone boundaries.

Enforcement ofsecurity policiesfor traffic traversing between zones.

Control of traffic across VLANs, subnets, or functional areas (e.g., trust, untrust, DMZ).

Other options:

Zone assignment is not used to simplify interface configuration (A).

Routing protocols and updates (B) are handled by routing instances, not zones.

SNMP monitoring (D) is enabled under system or services configuration, not zones.