cisco ccna exam topics

cisco ccna exam topics.SeOPAP: I AUTH-REQ id 3 len 18 from PAP: RouterA" SeO Authenticating peer RouterB "RouterB" SeO PAP: O AUTH-ACK id 2 len 5 SeOPAP: I AUTH-ACK id 3 len 5 SeO % LINEPROTO-5-UPDOWN: Line protocol on Interface SerialOz changed state to upIn this example, note that the authentication messages displayed are different. AUTH-REQ indicates that the router is requesting authentication from the server, while AUTH-ACK confirms that the password provided by the router is correct. Note that since both routers are requesting authentication, this means that they are both in PAP server mode.Unlike HDLC, PPP supports authentication. PAP authentication sends the username and password in plaintext, while CHAP does not do this, sending a hash calculated using the MD5 algorithm. To specify which PPP authentication method to use, use the command ppp authenticationo The command username enables you to create a local authentication table that lists the usernames and passwords used for authentication on the remote side. To troubleshoot PPP authentication, use the command debug ppp authentication Be sure to familiarize yourself with the output of this command.Hands-On Exercise 24.1Configuring PPPChapter 24 Introduction to WAN 657The previous sections discussed how to configure PPP on an IOS router, and you will deepen your knowledge of these elements by configuring PPP and authentication in this exercise. You will use the Boson NetSim simulator to complete this experiment; see the Preface section of this book for a diagram of the network used by this simulator. To start this simulator, click the tab Labs in the lower left corner,then click the tab McGraw-Hill in the upper left corner (tab Standard and Custom to the right). Next, double-click Exercise24-1, which will load the experimental configuration based on the exercises in Chapters 10 and 15.1. Check the network connectivity between the two routers.Click the label Lab Instructions and select 2600-1 from the drop-down list Devices; you can also click the label NetMap and double-click the Device icon 2600.1.On router 2600.1, check the status of the serial interface serial interface: show interface s0, confirm