120 Labs for Cisco CCNA 200-125 and CCENT Exams

Challenge Lab 11: CHAP with PAP Fallback

Lab Objective:

The objective of this lab exercise is for you to configure PAP fallback. This is not covered in earlier labs or in the CCNA syllabus; however, it might come up in the exam!

Lab Purpose:

PAP fallback is a useful feature if your CHAP authentication fails. Rather than watch a video solution, I have provided show runs and test commands where appropriate.

Certification Level:

This lab is suitable for both ICND2 and CCNA certification exam preparation.

Lab Difficulty:

This lab has a difficulty rating of 7/10.

Readiness Assessment:

When you are ready for your certification exam, you should complete this lab in no more than 15 minutes.

Lab Topology:

Please use the following topology to complete this lab exercise:

Task 1:

Configure the topology above. Test by pinging from RouterA to RouterB.

Task 2:

Configure a CHAP with PAP fallback on both routers. Ensure that the encapsulation is set to PPP on both routers.

Task 3:

Check your configurations with show commands (just show run in this case).

Solution

Show Runs 

RouterA 

hostname RA 
! 
username RB password 0 cisco 
archive 
log config 
hidekeys 
! 
interface Serial0/0 
ip address 10.0.0.1 255.255.255.252 
encapsulation ppp 
clock rate 2000000 
ppp authentication chap pap 
!          

RouterB 

hostname RB 
! 
username RA password 0 cisco 
archive 
log config 
hidekeys 
! 
interface Serial0/0 
ip address 10.0.0.2 255.255.255.252 
encapsulation ppp 
clock rate 2000000
ppp authentication chap pap

TEST:

N/A

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