Packet Tracer Activity IP Address Subnetting Challenge


The purpose of the Packet Tracer activity is to help you understand how Variable Length Subnet Mask (VLSM) is used to segment a large network into multiple smaller networks and to make more efficient use of the IP address space. In this lab you will design, document and implement a network addressing scheme using VLSM. Finally you will test the design to insure that the network has complete connectivity, you will also use Cisco IOS show commands to confirm proper configuration.   

Learning Objectives:

  • Design and document an addressing scheme based on requirements.
  • Apply a basic configuration to the devices.
  • Configure static routing between ISP routers.
  • Configure EIGRP routing in Region 1 and RIPv2 routing Region 2.
  • Disable routing updates on appropriate interfaces.
  • Configure and redistribute default routes.
  • Verify full connectivity between all devices in the topology.

A subnet allows the flow of network traffic between hosts to be segregated based on a network configuration. By organizing hosts into logical groups, subnetting can improve network security and performance.

Subnet Mask:

Perhaps the most recognizable aspect of subnetting is the subnet mask. Like IP addresses, a subnet mask contains four bytes (32 bits) and is often written using the same “dotted-decimal” notation. For example, a very common subnet mask in its binary representation 

11111111 11111111 11111111 00000000 

is typically shown in the equivalent, more readable form 

Applying a Subnet Mask:

A subnet mask neither works like an IP address, nor does it exist independently from them. Instead, subnet masks accompany an IP address and the two values work together. Applying the subnet mask to an IP address splits the address into two parts, an “extended network address” and a host address. For a subnet mask to be valid, its leftmost bits must be set to ‘1’. For example, 

00000000 00000000 00000000 00000000 

is an invalid subnet mask because the leftmost bit is set to ‘0’. Conversely, the rightmost bits in a valid subnet mask must be set to ‘0’, not ‘1’. Therefore, 

11111111 11111111 11111111 11111111 

is invalid.

All valid subnet masks contain two parts: the left side with all mask bits set to ‘1’ (the extended network portion) and the right side with all bits set to ‘0’ (the host portion), such as the first example above.

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3 Responses to “Packet Tracer Activity IP Address Subnetting Challenge”

  1. kaushal4053 says:


    Its a great file to work on. I actually found few discrepancies in the file. When I solve the network with the asked configuration, I need to divide such that B1-R1 should support 16000 host. but the answer it checks and verifies, according to the addresses specified for B2-R1, B1-R1 then supports only 8000 hosts.

    It conflicts with the instructions in the pdf and PT activity but matches with the image.

    Please guide me.

  2. snape_b says:

    I have problem with Ip address for Serial ports of Router1.
    And I think i have the same problem with router2))) but I have not come to it yet.
    So please guide me too, if somebody has solved it.

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