Which statement is correct about packet mode processing?

Packet mode processing on Juniper SRX Series devices operates statelessly, similar to a traditional router. It evaluates each packet individually based on its header information and configured stateless firewall filters. A defining characteristic of this mode is that it completely bypasses the flow module (flowd), which is the component responsible for creating and managing stateful sessions. Therefore, packet mode does not maintain any session state, making it suitable for high-performance routing environments where stateful inspection is not required.

A: Session-based processing is the defining feature of flow mode, not the stateless packet mode.

B: Advanced services like NAT, VPNs, and UTM are stateful and require the flow module, so they only operate in flow mode.

D: Stateful processing is the basis of flow mode. Packet mode is, by definition, stateless.

1. Juniper Networks TechLibrary

Understanding Session-Based and Packet-Based Processing: "When a device is operating in packet-based mode

the flow module is bypassed. You can

however

configure stateless firewall filters." This source directly confirms that packet mode bypasses the flow module (Answer C) and is stateless (refuting A and D).

URL: https://www.juniper.net/documentation/us/en/software/junos/flow-packet-processing/topics/concept/security-flow-based-packet-based-processing-understanding.html

2. Juniper Networks TechLibrary

Flow-Based and Packet-Based Processing Feature Guide: "In packet-based mode

the SRX Series device processes packets on a per-packet basis... In packet-based mode

some screen options and all Network Address Translation (NAT) services are not available." This confirms that advanced services like NAT do not work in packet mode (refuting B).

URL: https://www.juniper.net/documentation/us/en/software/junos/flow-packet-processing/index.html (Refer to the "Overview" section).