Will build up a network, a high school office buildings of different floors computer connection, each department on the first floor of the student affairs office has four terminal PC1, PC2, PC3, and PC4, the school office on the second floor there are four devices PC5, PC6, PC7, PC8, information center on the fourth floor, there are 2 servers S1, S2, set up a local area network (LAN), requirements: 1. The student affairs office and office equipment can not access, 2. The student can only access SI, the office can only access S2. Please draw the topology structure according to the requirement, indicate the vlans and IP address planning,