Most of companies have computer network that used to transfer data to fulfill the company need. To protect important information from unauthorized users, thus the network security system is required. In general, limiting the users’ access and protecting data communication in the computer network can be done by managing access right using Access Control List (ACL) and Secure Shell (SSH). There are two steps to manage access right and to protect data communication inside the network. Start with limiting the access from client to server and manageable switch as the communication gateway in the network. Finally, configure the SSH server and SSH client. As a result, only administrator and several users who have right to access the server and manageable switch and use the SSH connection to the server. So, server’s and other network devices’ configuration will safe. In addition, data communication between network devices also encrypted by SSH protocol to protect the important information.