4.4.8 Packet Tracer – Troubleshoot Inter-VLAN Routing Answers

4.4.8 Packet Tracer – Troubleshoot Inter-VLAN Routing Answers

Packet Tracer – Troubleshoot Inter-VLAN Routing (Answers Version)

Answers Note: Red font color or gray highlights indicate text that appears in the Answers copy only.

Addressing Table

Device

Interface

IP Address

Subnet Mask

Default Gateway

VLAN

R1

G0/1.10

172.17.10.1

255.255.255.0

N/A

VLAN 10

R1

G0/1.30

172.17.30.1

255.255.255.0

N/A

VLAN 30

PC1

NIC

172.17.10.10

255.255.255.0

172.17.10.1

VLAN 10

PC3

NIC

172.17.30.10

255.255.255.0

172.17.30.1

VLAN 30

Objectives

Part 1: Locate Network Problems

Part 2: Implement the Solution

Part 3: Verify Network Connectivity

Scenario

In this activity, you will troubleshoot connectivity problems caused by improper configurations related to VLANs and inter-VLAN routing.

Instructions

Part 1:  Locate the Network Problems

Examine the network and locate the source of any connectivity issues.

Open configuration window

Commands you may find useful include:

R1# show ip interface brief

R1# show interface g0/1.10

R1# show interface g0/1.30

S1# show interface trunk

  • Test connectivity and use the necessary show commands to verify configurations.
  • Verify that all configured settings match the requirements shown in the Addressing Table.
  • List all of the problems and possible solutions in the Documentation Table.

Documentation Table

Problems

Solutions

The G0/1 physical interface is up but G0/1.10 subinterface is administratively down.

Implement the no shutdown command to enable the G0/1.10 subinterface.

PC3 is configured with the wrong default gateway address.

Change the default gateway on PC3 from 172.17.10.1 to 172.17.30.1

Interface G0/1 on S1 is configured as an access port instead of trunk port.

Use the command switchport mode trunk to change the interface from access mode to trunk mode.

Subinterface VLAN assignments are switched on R1. The configured assignments do not match the ones shown in the Addressing Table.

Issue the no encapsulation dot1q command to remove the incorrect configuration. Then configure the subinterfaces with the correct encapsulation dot1q <vlan> command. Reenter the correct IP address information.

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Part 2:  Implement the Solutions

Implement your recommended solutions.

Close configuration window

Part 3:  Verify Network Connectivity

Verify the PCs can ping each other and R1. If not, continue to troubleshoot until the pings are successful.

 

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