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The last few sections dealt with the configuration of PPP on IOS routers. This exercise will help you reinforce this material by configuring PPP and authentication. You ll perform this lab using Boson s NetSim simulator. You can find a picture of the network diagram for Boson s NetSim simulator in the Introduction of this book. After starting the simulator, click the LabNavigator button. Next, double-click Exercise 25-1 and click the Load Lab button. This will load the lab configuration based on the exercises in s 11 and 16. 1. Check network connectivity between the two routers. At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1. From the 2600-1 router, verify the status of the serial interface: show interface s0. Make sure the encapsulation is HDLC. From the 2600-1 router, ping the 2600-2: ping 192.168.2.2. The ping should be successful. 2. On the 2600-1 router, set up PPP as the encapsulation on the serial0 interface. At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-1. On the 2600-1, enter the serial interface: configure terminal and interface serial0. Set up PPP as the data link frame type: encapsulation ppp and end. 3. Verify the status of the serial0 interface. View the status of the interface: show interface serial0. The physical layer should be up and the data link layer should be down the 2600-2 still has HDLC configured. Also, examine the output of the show command to verify that the encapsulation is PPP. 4. On the 2600-2 router, set up PPP as the encapsulation on the serial0 interface. At the top of the simulator in the menu bar, click the eRouters icon and choose 2600-2. On the 2600-2, enter the serial interface: configure terminal and interface serial0. Set up PPP as the data link frame type: encapsulation ppp and end. 5. Verify the status of the serial0 interface.

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For a more practical illustration of how an optional argument can simplify calls to some types of methods, consider the following program. It declares a method called Display( ), which displays a string. The string can be displayed in its entirety or only a portion of the string can be displayed.

// Demonstrate #elif. #define RELEASE using System; class Test { static void Main() { #if EXPERIMENTAL Console.WriteLine("Compiled for experimental version."); Use #elif. #elif RELEASE Console.WriteLine("Compiled for release."); #else Console.WriteLine("Compiled for internal testing."); #endif #if TRIAL && !RELEASE Console.WriteLine("Trial version."); #endif Console.WriteLine("This is in all versions."); } }

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Every rule is made to be broken. Before you take a photograph, examine the scene from several vantage points to determine the best composition. In most instances, the Rule of Thirds is the way to go, but other images are better when shot from straight on. If you have

The current (the rate of electron flow) corresponds to the rate of flow of the water coming out the bottom of the jug. When you doubled the voltage, you sent twice as much current through the wire and the light bulb became brighter.