CHCPOL003 - Business Data Communication and Networks - Variable Length Subnet Masks - IT Assessment Answer

Variable Length Subnet Masks - VLSMs - IT Assessment Answer

Assessment Task:

Section One – Variable Length Subnet Masks

1. Imagine that an organization is assigned the address block 169.222.0.0/18, and the organization needs one subnet with 220 hosts, one subnet with 128 hosts, and one subnet with 19 hosts.

2. Explain in your own words how the process of allocating subnets using VLSMs differs from the process of allocating subnets using a fixed-length subnet mask.

3. Imagine that an organization is assigned the address block 45.0.0.0/8, and the organization has an existing subnet with 190 hosts, and another existing subnet with 53 hosts. Further imagine that after the network has been in use for some time, the organization must add another subnet that requires 105 hosts.

First, use the process established in the overview section to create the network identifiers for the two existing subnets. Second, use the same process to create the network identifier for the new subnet (illustrated in step 4). Last, identify the number of addresses that are left unallocated in the gap between the second and third subnet. Make sure to show your work.

4. Explain in your own words why allocating a new subnet on existing network results in an unavoidable gap of unallocated addresses.

5. Now it is your turn to allocate a new subnet in-between existing subnet on a network. In the three parts below, keep in mind that there will be a gap of unallocated addresses in your subnet allocation, like the example given in step 7.

a) Imagine that an organization is assigned the address block 222.221.128.0/17, and the organization has an existing subnet with 107 hosts, and another existing subnet with 51 hosts. Using the process given in the overview section, allocate both subnets and identify the network identifier for both subnets. Make sure to show your work.

b) Now the organization decides to add an additional subnet that supports 113 hosts. Allocate this subnet and identify its network identifier, making sure to show your work.

c) Last, the organization decides to add one additional subnet that supports 9 hosts. Allocate this subnet and identify its network identifier, making sure to show your work.

6. Explain in your own words how the process of allocating a new subnet in-between existing subnetworks.

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