2.5.2 Packet Tracer – Challenge PPP Configuration Answers

2.5.2 Packet Tracer – Challenge PPP Configuration Answers


Addressing Table

Device Interface IP Address Subnet Mask Default Gateway
R1 Fa0/1 N/A
S0/0/0 N/A
S0/0/1 N/A
R2 Lo0 N/A
S0/0/0 N/A
S0/0/1 N/A
R3 Fa0/1 N/A
S0/0/0 N/A
S0/0/1 N/A

Learning Objectives

  • Configure and activate interfaces.
  • Configure OSPF routing on all routers.
  • Configure PPP encapsulation on all serial interfaces.
  • Configure PPP CHAP authentication.


In this lab, you will configure PPP encapsulation on serial links using the network shown in the topology diagram. You will also configure PPP CHAP authentication. If you need assistance, refer back to the Basic PPP Configuration lab, but try to do as much on your own as possible.

Task 1: Configure and Activate Serial and Ethernet Addresses

Step 1. Configure interfaces on R1, R2, and R3.

The addressing scheme is listed on the topology and in the Addressing Table. Some interface addresses are provided, but for some interfaces only the network is provided. In the cases where you are only given the network address, you may use any valid address on the specified network in order to be graded correctly in Packet Tracer.

Configure the interfaces for R1, R2, and R3 according to the topology. On the DCE sides of the serial links, the clock rate is 64000 bits.

Step 2. Verify IP addressing and interfaces.

Verify that all the interfaces are up at both the physical and data link layers. Directly connected routers should be able to ping each other.

Step 3. Configure the Ethernet interfaces of PC1 and PC3.

Step 4. Test connectivity between the PCs.

Should the PCs be able to ping each other at this point? Can they ping their default gateways?

Task 2: Configure OSPF on Routers

Step 1. Enable OSPF routing on the routers.

When configuring OSPF routing, use a process ID of 1.

Step 2. Verify that you have full network connectivity.

All routers should have routes to all networks and now be able to ping any device.

Task 3: Configure PPP Encapsulation on Serial Interfaces

Step 1. Configure PPP on the serial interfaces of all three routers.

Currently encapsulation is set to HDLC on all the serial links. In order to configure authentication later, encapsulation must be set to PPP.

Step 2. Verify that all serial interfaces are using PPP encapsulation.

If connected serial interfaces have mismatched encapsulation, the link will go down. Make sure all interfaces are set to PPP encapsulation.

Task 4: Configure PPP CHAP Authentication

The password for CHAP authentication is cisco.

Can all routers communicate with one another? Can the PC1 ping PC3?

Step 3. Check results.

Your completion percentage should be 100%. If not, click Check Results to see which required components are not yet completed.

Download Packet Tracer (.pka) file:

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