How are extended ACLs typically placed in relation to traffic?

Extended Access Control Lists (ACLs) are strategically placed as close as possible to the traffic's destination. This placement allows for more effective management of network traffic and enhances security. When extended ACLs are positioned near the destination, they can precisely control which types of traffic are permitted or denied into specific network segments, ultimately protecting sensitive resources.

By filtering traffic closer to its intended endpoint, an extended ACL can prevent unwanted or malicious traffic from ever reaching its destination. This proactive approach reduces the risk of potential threats affecting internal systems, as it blocks harmful packets before they can do any damage.

In contrast, placement at the source might not be as effective since the traffic would still traverse the network before being filtered, potentially exposing the destination to unnecessary risks. Locations such as the access layer of the network or the perimeter serve different purposes; for instance, the access layer deals with network user connections, and the perimeter focuses on outside threats. Thus, positioning extended ACLs near the destination provides the best control over the incoming traffic, making them an essential tool in network security management.