ACL (Access control list): In order to control the access to a particular number of users the wireless network makes use of ACL which is access control list. In this the unique address of the clients or the users are used and hence a check can be put as to which user is using the net. If the address of the user is not there in the list of legitimate users, access is denied. The control list behaves in a way very similar to a guest list in a party where only a limited number of guests are invited and only by showing the identification, they are verified from the guest list with the security guards and allowed to enter the party.