Juniper SRX Series devices use Intrusion Prevention System (IPS) to identify and mitigate different forms of attacks. The two primary types of attack objects utilized by IPS on these devices are protocol anomaly-based attacks and signature-based attacks. Protocol anomaly-based attacks involve detecting deviations from standard protocol behaviors, while signature-based attacks involve using predefined patterns or signatures of known threats for detection. Both methods are crucial for comprehensive threat detection and mitigation on SRX Series devices.

The 'high watermark' configuration parameter determines how full the session table must be to implement the early age-out function. It sets the threshold at which the system begins to remove the oldest sessions to make room for new ones, avoiding the session table from becoming completely full and ensuring smoother session management.

To improve resiliency for individual redundancy groups in an SRX4600 chassis cluster, IP address monitoring and interface monitoring are the correct features. IP address monitoring allows the system to track the availability of upstream devices and trigger failover if necessary. Similarly, interface monitoring tracks the status of physical interfaces and can initiate redundancy group state transitions if any critical interfaces go down. These features ensure that faults in the network are quickly identified and addressed, thereby improving overall resiliency.