17-9 3 Tier Information System Figure 17. 4 erver Server Mainframe Hub Wireless Link Server Client Client Laptop Client Client " win/MeGraw-HHill CThe McGraw-Hill Companies, Inc, 200017-9 Irwin/McGraw-Hill ©The McGraw-Hill Companies, Inc., 2000 3 Tier Information System Server Server Server Client Client Client Client Mainframe Hub Wireless Link Laptop Figure 17.4