<![CDATA[This research aims to optimize network management at SMKN 3 Buduran through the implementation of Open Shortest Path First (OSPF), Quality of Service (QoS) using the Queue Tree method, and TLS Host-based firewall filtering on MikroTik devices. The main problems identified in the school network include high delay and jitter values, uneven bandwidth distribution, and suboptimal network traffic management. This research applied the PPDIOO (Prepare, Plan, Design, Implement, Operate, Optimize) method with network simulation implemented using Cisco Packet Tracer and VirtualBox. The implementation stage involved configuring OSPF routing to support automatic rerouting processes, applying QoS for bandwidth management, and implementing firewall filtering to restrict access to certain websites. Network performance testing was conducted using Quality of Service (QoS) parameters, namely delay, jitter, and packet loss. The results showed that the implementation of OSPF and QoS significantly improved network performance. The average delay decreased from 78 ms to 59 ms, while the maximum delay decreased from 1193 ms to 117 ms. In addition, network connectivity remained stable during link failures through the automatic rerouting mechanism provided by OSPF. Furthermore, firewall filtering successfully restricted access to non-educational websites, resulting in more controlled network usage. Based on the testing results, the implementation of OSPF, Queue Tree QoS, and firewall filtering proved effective in improving the stability, efficiency, and quality of network services at SMKN 3 Buduran.]]>
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