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Lab – Troubleshooting Basic PPP with Authentication This lab has been updated for use on NETLAB+ Topology © 2017 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 1 of 6 Lab – Troubleshooting Basic PPP with Authentication Addressing Table Device Interface IP Address Subnet Mask Default Gateway G0/1 192.168.1.1 255.255.255.0
    © 2017 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 1  of 6   Lab  –  Troubleshooting Basic PPP with Authentication   This lab has been updated for use on NETLAB+ Topology  Lab  –  Troubleshooting Basic PPP with Authentication © 2017 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 2  of 6    Addressing Table Device Interface IP Address Subnet Mask Default Gateway R1 G0/1 192.168.1.1 255.255.255.0 N/A S0/0/0 (DCE) 192.168.12.1 255.255.255.252 N/A S0/0/1 192.168.13.1 255.255.255.252 N/A R2 Lo0 209.165.200.225 255.255.255.252 N/A S0/0/0 192.168.12.2 255.255.255.252 N/A S0/0/1 (DCE) 192.168.23.1 255.255.255.252 N/A R3 G0/1 192.168.3.1 255.255.255.0 N/A S0/0/0 (DCE) 192.168.13.2 255.255.255.252 N/A S0/0/1 192.168.23.2 255.255.255.252 N/A PC-A NIC 192.168.1.3 255.255.255.0 192.168.1.1 PC-C NIC 192.168.3.3 255.255.255.0 192.168.3.1 Objectives Part 1: Configure the PC Hosts Part 2: Troubleshoot the Data Link Layer Part 3: Troubleshoot the Network Layer Background / Scenario The routers at your company were configured by an inexperienced network engineer. Several errors in the configuration have resulted in connectivity issues. Your manager has asked you to troubleshoot and correct the configuration errors and document your work. Using your knowledge of PPP and standard testing methods, find and correct the errors. Ensure that all of the serial links use PPP CHAP authentication, and that all of the networks are reachable. Note : The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with Cisco IOS Release 15.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.0(2) (lanbasek9 image). Other routers, switches, and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers.   Part 1: Configure the PC Hosts In Part 1, you will configure basic settings on the PC hosts. Step 1: Configure the PC addressing  Assign IP addresses and default gateways to the PCs according to the Addressing Table.  Lab  –  Troubleshooting Basic PPP with Authentication © 2017 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 3  of 6   Part 2: Troubleshoot the Data Link Layer In Part 2, you will use show  commands to troubleshoot data link layer issues.  All routers have the same passwords. The privileged EXEC mode password is class . The password for console and vty access is cisco .  All serial interfaces should be configured with PPP encapsulation and authenticated with CHAP using the password of chap123 . Be sure to verify settings, such as clock rate, encapsulation, CHAP, and usernames/passwords. Step 1: Examine the R1 configuration. a. Use the show interfaces  command to determine whether PPP has been established on both serial links. From the show interfaces  results for S0/0/0 and S0/0/1, what are possible issues with the PPP links?  ____________________________________________________________________________________  ____________________________________________________________________________________  ____________________________________________________________________________________ b. Use the debug ppp authentication  command to view real-time PPP authentication output during troubleshooting. R1# debug ppp authentication   PPP authentication debugging is on c. Use the show run interface s0/0/0 command to examine the settings on S0/0/0. Resolve all problems found for S0/0/0. Record the commands used to correct the configuration.  ____________________________________________________________________________________  ____________________________________________________________________________________  After correcting the issue, what information does the debug output provide?  ____________________________________________________________________________________ d. Use the show run interface s0/0/1  command to examine the settings on S0/0/1. Resolve all problems found for S0/0/1. Record the commands used to correct the configuration.  ____________________________________________________________________________________  ____________________________________________________________________________________  After correcting the issue, what information does the debug output provide?  ____________________________________________________________________________________  ____________________________________________________________________________________ e. Use the no debug ppp authentication  or undebug all  command to turn off the debug PPP output. f. Use the show running-config | include username  command to verify the correct username and password configurations.  Lab  –  Troubleshooting Basic PPP with Authentication © 2017 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 4  of 6   Resolve all problems found. Record the commands used to correct the configuration.  ____________________________________________________________________________________ Step 2: Examine the R2 configuration. a. Use the show interfaces  command to determine if PPP has been established on both serial links. Have all links been established? _________ If the answer is no, which links need to be examined? What are the possible issues?  ____________________________________________________________________________________  ____________________________________________________________________________________  ____________________________________________________________________________________ b. Use the show run interface  command to examine links that have not been established. Resolve all problems found for the interfaces. Record the commands used to correct the configuration.  ____________________________________________________________________________________  ____________________________________________________________________________________  ____________________________________________________________________________________ c. Use the show running-config | include username  command to verify the correct username and password configurations. Resolve all problems found. Record the commands used to correct the configuration.  ____________________________________________________________________________________  ____________________________________________________________________________________ d. Use the show ppp interface serial command for the serial interface that you are troubleshooting. Has the link been established? _________ Step 3: Examine the R3 configuration. a. Use the show interfaces  command to determine whether PPP has been established on both serial links. Have all links been established? __________ If the answer is no, which links need to be examined? What are the possible issues?  ____________________________________________________________________________________  ____________________________________________________________________________________ b. Using the show run interface command to examine on any serial link that has not been established. Resolve all problems found on the interfaces. Record the commands used to correct the configuration.  ____________________________________________________________________________________  ____________________________________________________________________________________ c. Use the show running-config | include username  command to verify the correct username and password configurations.
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