There is a logistics company, has five department, Marketing Department, customer service department, the department of transportation, warehousing department, financial department, need to establish a network; Among them, the customer department can be external users access to server, client group has foreign network, the network has its own domain name, has the function of the FTP server, financial and other cannot be external access, but able to visit each other between the five departments, five departments respectively belong to different networks, in addition to the department of foreign service address is manually assign outside, the rest of the machine IP address is dynamically allocated automatically, which is suitable for dynamic routing protocol, routing protocol