Abstract: An ACL is a series of IOS commands that filter packets based on information in the packet header. By default, a router does not have any ACLs configured. When an ACL is applied to an interface, the router performs the additional task of evaluating all network packets as they pass through the interface to determine if the packet can be forwarded. practice making a design network of two buildings for company security by taking the access control list to apply to the filter Several tasks and to give made the network secure. Introduction we have discussed on the network to have the design of two buildings for the company. this in design the building on the left is divided into three sections such as accounting marketing HR. The building on the right is divided into four to have D&R staff IT and server. the two buildings are connected to the core router and allow the device to communicate so that all devices can access the internet. then the core router is where we nee...