An organization has a class C network 200.1 .1 and wants to...

An organization has a class C network $200.1 .1$ and wants to form subnets for four departments, with hosts as follows: A 72 hosts B 35 hosts C 20 hosts D 18 hosts There are 145 hosts in all. (a) Give a possible arrangement of subnet masks to make this possible. (b) Suggest what the organization might do if department D grows to 34 hosts.

An organization has a class C network $200.1 .1$ and wants to form subnets for four departments, with hosts as follows:
A 72 hosts
B 35 hosts
C 20 hosts
D 18 hosts
There are 145 hosts in all.
(a) Give a possible arrangement of subnet masks to make this possible.
(b) Suggest what the organization might do if department D grows to 34 hosts.

Key Concepts

Network Scalability and Reallocation

Network scalability and reallocation refer to the planning and adjustment strategies needed when a subnet's requirements change over time. If an initial subnet is designed to handle a certain number of hosts and later experiences growth, the network design must accommodate this expansion. This might involve reassigning host addresses, using larger subnet blocks, or planning a network reallocation to ensure the growing segment continues to meet its needs without impacting overall network efficiency.

Subnet Mask Calculation

Subnet mask calculation involves determining the appropriate mask that will yield a sufficient number of host addresses in a subnet. This often requires solving the equation 2^n - 2 >= required number of hosts, where n is the number of bits allocated to the host portion. This calculation is crucial to ensure that each subnet has just enough addresses to accommodate its hosts, taking into account the network and broadcast addresses.

Class C Network

A Class C network is one of the classes of IPv4 addresses that typically offers a small number of host addresses. It has a default subnet mask of 255.255.255.0, meaning that the first three octets designate the network portion while the last octet is used for host addresses. This limitation makes it essential to use techniques like subnetting to efficiently allocate addresses to different segments or departments within an organization.

Subnetting

Subnetting is the process of dividing a larger network into smaller, more manageable sub-networks (subnets). This technique helps improve network performance and security by isolating groups of hosts and reducing broadcast domains. In planning a subnet structure, the network administrator allocates parts of the available address space to meet the needs of each separate segment or department.

Variable Length Subnet Masking (VLSM)

VLSM is an advanced form of subnetting that allows for subnets of different sizes to be created from the same network address space, based on the number of hosts required in each subnet. By using VLSM, an organization can allocate a subnet mask that matches the specific host requirements for each department, reducing wastage of IP addresses and optimizing the overall network design.

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