Which of the following is considered best practice in the placement of ACLs?

Placing access control lists (ACLs) in a network is crucial for ensuring efficient traffic management and security. The practice of filtering unwanted traffic before it travels onto a low-bandwidth link is considered best practice because it conserves network resources and enhances overall efficiency.

By placing ACLs in a position where they can intercept and filter traffic before it consumes valuable bandwidth on constrained links, network administrators can reduce the likelihood of congestion and ensure that the available bandwidth is used for legitimate traffic. This proactive filtering approach also minimizes unnecessary load on network devices, allowing them to function more effectively and improving overall network performance.

In contrast to this, placing extended ACLs close to the destination may still be effective in some scenarios but does not offer the same efficiency in managing bandwidth. Similarly, while placing standard ACLs close to the source can be beneficial, it is typically less effective at optimizing bandwidth usage compared to filtering traffic before it reaches more restricted resources. Deploying ACLs in the center of the network is not advisable because it may introduce unnecessary delays and complexity in traffic management.