<![CDATA[This study investigates the implementation of Access Control Lists (ACLs) as a strategic network security mechanism within organizational environments. The rapid advancement of information systems necessitates effective access control to protect data and network resources from unauthorized intrusion. This research designs and simulates network security using Cisco Packet Tracer to demonstrate how ACLs can restrict access based on predefined security policies. The network topology consists of a router, a switch, two client categories (administrator and general user), and a server. An Extended ACL was deployed on the router to authorize administrator access to the server while restricting access from general users. Simulation results indicate that prior to ACL implementation, all clients maintained unrestricted server access. Following the deployment of the ACL, only the administrator could access the server, whereas user access was successfully blocked. These findings demonstrate that ACLs are effective in enhancing network security by maintaining data confidentiality without compromising the availability of network services.]]>
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