Which type of filtering requires knowledge of both inbound and outbound network traffic?

The correct choice involves understanding the distinction between ingress and egress filtering and their relevance in network security. Ingress filtering focuses on controlling incoming traffic to a network, while egress filtering is about managing outbound traffic leaving the network. However, when analyzing and securing a network comprehensively, both types of traffic must be monitored and understood together.

When implementing effective network security measures, it is crucial to understand how both inbound and outbound traffic interacts with each other. For example, ingress filtering might block malicious traffic attempting to enter the network, while egress filtering can prevent compromised devices within the network from communicating back to attackers or leaking sensitive information.

Using both types of filtering in conjunction enhances the overall security posture by providing a holistic view of network activity. This approach ensures that traffic is scrutinized both ways, allowing for the detection and mitigating of potential threats effectively. Therefore, understanding both inbound and outbound traffic is essential for maintaining a secure environment, highlighting the importance of both ingress and egress filtering as it relates to overall network security.