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.