Which filtering technique scans the headers of IP packets leaving a network to ensure unauthorized or malicious traffic never leaves the internal network?

Which filtering technique scans the headers of IP packets leaving a network to ensure unauthorized or malicious traffic never leaves the internal network?

• A. Ingress filtering
• B. TCP Intercept
• C. Wavelet-Based Signal Analysis
• D. Egress filtering

Answer: (D)

Outbound control is the idea here. Egress filtering screens packets as they leave the network, enforcing rules on what can exit. By inspecting IP headers, it can verify that the source addresses actually belong to the internal network and that the destinations, protocols, and ports are allowed. This helps prevent data exfiltration, leakage of sensitive information, and traffic that appears as if it’s coming from inside the network but shouldn’t leave. It’s different from inbound filtering, which guards what comes in from outside. Other options aren’t built for outbound enforcement: one is a form of proxy interception, and another is a signal-processing technique not used for packet filtering. Therefore, the described technique is egress filtering.

Outbound control is the idea here. Egress filtering screens packets as they leave the network, enforcing rules on what can exit. By inspecting IP headers, it can verify that the source addresses actually belong to the internal network and that the destinations, protocols, and ports are allowed. This helps prevent data exfiltration, leakage of sensitive information, and traffic that appears as if it’s coming from inside the network but shouldn’t leave. It’s different from inbound filtering, which guards what comes in from outside. Other options aren’t built for outbound enforcement: one is a form of proxy interception, and another is a signal-processing technique not used for packet filtering. Therefore, the described technique is egress filtering.