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ccna certification financial aid.The number of modules and module types may vary, and of course the operating system needs to match. Switches can also use devices such as the 2960 and 3750. The G0/0 Ethernet interface of router R1.R4 is connected to the corresponding interface of FaO/1.FaO/4 of switch S1; the G0/1 Ethernet interface is connected to the corresponding interface of FaO/1.FaO/4 of switch S2. FaO/1 and Fa0/3 interfaces of switch S3 are connected to FaO/15 and FaO/16 of S1, and FaO/2 and FaO/4 interfaces of switch S3 are connected to FaO/15 and FaO/16 of S2. The 0/10 interface of switch S1 is connected to the Server NIC, and the Fa0/10 interface of switch S2 is connected to the TestPC NIC, so the reader can flexibly connect the TestPC to the corresponding interface of the switch according to the actual needs of the experiment.The experimental topology (serial connection part) is shown in Figure 1-2. The S0/0/0 and S0/0/1 serial ports of router R1 are connected to the S0/0/0 and S0/1/1 serial ports of router R2, the S0/0/1 serial port of router R2 is connected to the S0/0/1 serial port of router R3, the S0/1/0 serial port of router R2 is connected to the S0/0/1 serial port of router R4, the S0/0/0 serial port of router R3 and the S0/0/0 serial port and router R4's 0/0/0 serial port connection.Figure 1.2 Experimental topology (serial connection part)1.1.1 Router Interface NamingThe 2911 router in the experimental topology of this book is used as an example to illustrate router interface naming, as shown in Figure 1-3. The 2911 router includes three fixed Gigabit Ethernet interfaces, one Service Module (SM) slot - used to replace the Network Module slot for voice/fax and the Expansion Module slot, four EnhancedHigh- Speed WANInterface Cards (EnhancedHigh Speed WANInterface Card (EHWIC) slots or two double-width EHWIC slots (using the double-width EHWIC slots will occupy two single-width EHWIC slots).Figure 1-3 Router Interface NamingChapter 1 Experiment Preparation .5.HW1C-4ESWM HWIC-2T Wow* Bit Ethernet InterfaceEHWIC^S1 Gigabit Ethernet interfaces are named GigabitEthemetO/O, GigabitEthemetO/1, and GigabitEthemetO/2, which are specifically identified on the router as G0/0, G0/1, and G0/2o