When should ACLs be applied according to best practices?

Applying ACLs (Access Control Lists) throughout the network, including critical paths, is considered best practice for several reasons. First, distributing ACLs across all relevant network devices enhances overall security by ensuring consistent policy enforcement at various points. This reduces the risk of unauthorized access or data breaches, as network segments can be individually secured.

Second, placing ACLs only at network entry points may leave internal segments vulnerable. For example, if an attacker manages to bypass the entry point, any internal communications may go unchecked. Therefore, implementing ACLs on critical paths helps monitor and control network traffic more effectively, ensuring that sensitive data and operations are protected even after the initial entry point.

Moreover, strategically deploying ACLs across the network allows for more granular and specific controls tailored to different segments or user groups. This layered security approach aids in defending against a variety of threats, thereby enhancing the network's resilience.

Deploying ACLs solely on user devices or just on network devices not only limits the security posture but also fosters inconsistencies across the network. A comprehensive strategy that touches all network areas ensures better management and streamlined traffic control, leading to improved performance and security.

Thus, the practice of integrating ACLs throughout the network, especially along critical paths, maximizes both security and