subnetting my coffee shop

Hey there! I need your help with something exciting. I’m launching a new coffee shop and I need some assistance with designing the networks. I’m looking for a subnetting expert, and I think that’s you, right? If you’ve been following our subnetting series and have mastered the techniques, this will be a great test for you. The challenge here is subnetting based on host requirements, which is a bit different from what we’ve covered before. Each coffee shop needs to accommodate around 40 hosts, including employees, servers, wireless access points, and guests. So, we need to subnet the existing network, which is currently on the subnet, into three subnets. Can you tackle this challenge? Let’s see if you can subnet based on host requirements!

Let’s dive in and break down this task. We have a coffee shop network on the subnet, and we need to divide it into three subnets, each accommodating around 40 hosts. The process of subnetting based on host requirements is similar to subnetting based on network requirements, but with a slight difference in the direction of hacking or saving host bits. To determine the increment for each network, we’ll use the Nora Two chart, which represents the size of the network. The three subnets created will be,, and We’ll also determine the fourth octet of the IP address and represent it in decimal. This example showcases how to effectively subnet and address coffee shop networks. Exciting, right? So, go ahead and see if you can tackle this challenge. You’ve got what it takes!

Subnetting My Coffee Shop

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In this article, we will explore the concept of subnetting and its application in designing the networks for coffee shops. Subnetting is the process of dividing a large network into smaller subnetworks to efficiently manage and allocate IP addresses. Specifically, we will focus on subnetting based on host requirements, which involves determining the number of host bits to reserve in the subnet mask to accommodate the desired number of hosts in each network.

Coffee Shop Network Background

Currently, the coffee shop network is on the subnet, which provides a maximum of 256 IP addresses. However, as the business expands and opens new coffee shops, it becomes necessary to divide the network into three subnets to cater to the increased number of hosts. Each coffee shop requires approximately 40 hosts, including employees, servers, wireless access points, and guests.

Host Requirements and Subnetting

To subnet the coffee shop network based on host requirements, we need to reserve the required number of host bits in the subnet mask. The subnet mask is a 32-bit value that determines the network and host portions of an IP address. By manipulating the subnet mask, we can create subnets of varying sizes.

Similarity to Subnetting Based on Network Requirements

Subnetting based on host requirements is similar to subnetting based on network requirements, with one key difference. In subnetting based on host requirements, we reserve the necessary host bits from the right-most position in the subnet mask, while in subnetting based on network requirements, we start from the left-most position and remove host bits. This difference in direction is the only change in the process.

Determining Network Increments

To determine the network increments for each subnet, we can use the Nora Two chart. This chart is similar to the binary representation of numbers but with each value multiplied by two. We refer to the Nora Two chart to find the number that can accommodate the desired number of hosts in each network. For example, if each coffee shop requires 40 hosts, we look for a number on the chart that is equal to or greater than 40. In this case, the number is 64.

Creating the Three Subnets

Using the determined network increment, we can create the three subnets for the coffee shop network. Starting from the original network address (, we allocate the first subnet as, which provides 64 IP addresses. The second subnet is, and the third subnet is

Determining the Fourth Octet

In the original subnet mask (, the first three octets (255.255.255) are fixed. To determine the fourth octet, we need to look at the binary representation of the host bits we reserved. In this case, six host bits were reserved, represented as 110000. The on bits (1s) in the binary representation correspond to specific numbers in decimal. By converting the on bits to decimal, we obtain the value 192 for the fourth octet.

CIDR Notation

CIDR (Classless Inter-Domain Routing) notation is a shorthand representation of an IP address and its associated subnet mask. In CIDR notation, the subnet mask is expressed as a slash followed by the number of network bits, known as the prefix length. For the coffee shop network, the CIDR notation would be /26, indicating that the first 26 bits of the IP address are designated for the network portion.

Example: Subnetting and Addressing Coffee Shop Networks

Let’s consider an example to demonstrate the process of subnetting and addressing coffee shop networks. Starting with the original subnet, we determined that each coffee shop requires 40 hosts. Using the Nora Two chart, we found that the network increment should be 64. We created three subnets, namely,, and The fourth octet for each subnet was determined based on the reserved host bits, resulting in the values 192, 0, and 128, respectively. Finally, using CIDR notation, we represented each subnet as,, and

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Example: Subnetting for an ISP

Let’s explore another example to understand the importance of subnetting skills. Suppose an ISP (Internet Service Provider) has five customers who each require at least 20 static IP addresses. The provided IP address range is 142.0.200/16. In this case, we need to reserve five host bits for the 20 addresses. Converting the subnet mask from binary to decimal, we obtain The network increment is determined as 32, and the networks are created by counting up from 200. Thus, the subnets for the five customers are,,,, and Each network has 32 addresses, with 30 usable addresses for each customer.

Importance of Subnetting Skills

Understanding subnetting skills is crucial for network engineers and IT professionals. Subnetting allows for efficient allocation of IP addresses and optimization of network resources. It enables the creation of smaller, manageable subnetworks within a larger network, improving overall network performance and security. By mastering subnetting, professionals can effectively design and maintain networks, troubleshoot connectivity issues, and ensure proper IP address management.

In conclusion, subnetting is an essential skill for managing networks, including coffee shop networks. Subnetting based on host requirements involves determining the necessary host bits to reserve in the subnet mask to accommodate the desired number of hosts in each network. By following a structured process and using tools like the Nora Two chart, network engineers can design efficient and scalable networks for various applications.

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