ACL Mechanisms
  
  
    For many applications of ACLs, it is not necessary to know the details of
      how ACLs work. However, if you find that your application of ACLs is constrained by hardware
      limitations, you can often rearrange the ACLs to use the hardware more efficiently. The
      following sections go into some detail about how the ACLs use hardware resources, and provide
      some suggestions about how to reorder or rewrite ACLs to use fewer resources.