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how to troubleshoot using packet tracer?


i really need help on this qns i dont understand what my teacher teach.. it would be very appreciated if you can ans this qns

Lab 1.3.3: Troubleshooting a Small Network

Task 1: Examine the Logical LAN Topology

The IP address block of /23 is subnetted to meet the following requirements:

Subnet Number of Hosts

Subnet A 174

Subnet B 60

Additional requirements and specifications:

The 0 subnet is used.

The smallest possible number of subnets that satisfy the requirements for hosts should be used,

keeping the largest possible block in reserve for future use.

Assign the first usable subnet to Subnet A.

Host computers use the first IP address in the subnet. The network router uses the last network

host address.

Based on these requirements, the following topology has been provided to you:

Subnet A

Specification                   Value

IP mask (decimal) 

IP address            

First IP host address

Last IP host address

Subnet B

Specification                     Value

IP mask (decimal)  

IP address             

First IP host address

Last IP host address

Examine each of the values in the tables above and verify that this topology meets all requirements and

specifications. Are any of the given values incorrect? ___________

If yes, correct the values in the table above and write the corrected values below:



Create a configuration table similar to the one below using your corrected values:

Device                                               IP address                          Mask Gateway


Router1–Fa0/0                         N/A


Router1–Fa0/1                      N/A

Task 2: Cable, Erase, and Reload the Routers

Step 1: Cable the network.

Cable a network that is similar to the one in the topology diagram.

Step 2: Clear the configuration on each router.

Clear the configuration on the router using the erase startup-config command and then reload the

router. Answer no if asked to save changes.

Task 3: Configure the Host Computers

Step 1: Configure host computers.

Configure the static IP address, subnet mask, and gateway for each host computer based on the

configuration table created in Task 1. After configuring each host computer, display and verify the host

network settings with the ipconfig /all command.

Task 4: Load the Router with the Supplied Scripts



config term


hostname Router1


enable secret class


no ip domain-lookup


interface FastEthernet0/0

description connection to host1

ip address

duplex auto

speed auto


interface FastEthernet0/1

description connection to switch1

ip address

duplex auto

speed auto



line con 0

password cisco


line vty 0


line vty 1 4

password cisco




Task 5: Identify Connectivity Problems

Step 1: Use the ping command to test network connectivity.

Use the following table to test the connectivity of each network device

From                               To                                      IP Address                                                       Ping Results

Host1                     NIC IP address                   

Host1                     Router1, Fa0/0                    

Host1                     Router1, Fa0/1                    

Host1                     Host2                                  

Host2                     NIC IP address                     

Host2                     Router1, Fa0/1                     

Host2                     Router1, Fa0/0                     

Host2                     Host1                                  

Task 6: Troubleshoot Network Connections

Step 1: Begin troubleshooting at the host connected to the BRANCH router.

From host PC1, is it possible to ping PC2? _________

From host PC1, is it possible to ping the router fa0/1 interface? _________

From host PC1, is it possible to ping the default gateway? _________

From host PC1, is it possible to ping itself? _________

Where is the most logical place to begin troubleshooting the PC1 connection problems?



Step 2: Examine the router to find possible configuration errors.

Begin by viewing the summary of status information for each interface on the router.

Are there any problems with the status of the interfaces?



If there are problems with the status of the interfaces, record any commands that are necessary to correct

the configuration errors.



Step 3: Use the necessary commands to correct the router configuration.

Step 4: View a summary of the status information.

If any changes were made to the configuration in the previous step, view the summary of the status

information for the router interfaces.

Does the information in the interface status summary indicate any configuration errors on Router1?


If the answer is yes, troubleshoot the interface status of the interfaces.

Has connectivity been restored? ________

Step 5: Verify the logical configuration.

Examine the full status of Fa 0/0 and 0/1. Is the IP addresses and subnet mask information in the

interface status consistent with the configuration table? _______

If there are differences between the configuration table and the router interface configuration, record any

commands that are necessary to correct the router configuration.



Has connectivity been restored? ________

Why is it useful for a host to ping its own address?



Task 7: Clean Up

Unless directed otherwise by your instructor, erase the configurations and reload the switches.

Disconnect and store the cabling. For PC hosts that are normally connected to other networks (such as

the school LAN or to the Internet), reconnect the appropriate cabling and restore the TCP/IP settings.

1 Reply 1

Hi hussian,

Here is the answer of your question:

Please check.

Here i am attaching the whole test scenrion of this:

and config of router.

error was:

check the both ip of router interface and mask and correct it.

Please mark this question as answered and rate it.


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