The Turbo ACL feature compiles ACLs into a set of lookup tables, while maintaining first-match requirements. Packet headers enable you to access these tables in a small, fixed number of lookups, independently of the existing number of ACL entries. The CPU load is fixed, regardless of the size of the ACL, allowing for larger ACLs without incurring any CPU overhead penalties. The Cisco NSE-1 offers accelerated Turbo ACL, enabling you to achieve much higher performance than with the traditional and turbo access lIST features. Network Address Translation Two Internet scalability challenges are the depletion of registered IP address space and scaling in routing.
Incoming traffic is translated back for delivery within the internal network.
Thus, NAT allows an organization with unregistered private addresses to connect to the Internet by translating the addresses into globally registered IP addresses. NAT also increases network privacy by hiding internal IP addresses from external networks. CEF optimizes network performance and scalability for networks with large, dynamic traffic patterns such as the Internet and networks with intensive Web-based applications or interactive sessions. Resilience-CEF offers an unprecedented level of switching consistency and stability in large, dynamic networks. In dynamic networks, fast switching cache entries are frequently invalidated because of routing changes.