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Subnetting my coffee shop

Understanding Subnetting in Practical Terms: Designing Coffee Shop Networks

Welcome back to another blog post where we dive into the riveting world of network design. Today, we’re scratching the itch of a very interesting scenario: subnetting for coffee shops. I’ve been tasked with creating a network design that provides a robust and efficient IP addressing scheme for a series of new coffee shops. So, grab a cup of joe, and let’s embark on this caffeinated networking adventure together.

Introduction to the Scenario

Imagine you are launching a series of coffee shops, each requiring a distinct network to support employees, devices, and guests. You have a single /24 network at your disposal: 10.1.1.0/24. The goal is to carve out this network to accommodate three coffee shops, each with specific host requirements.

Each coffee shop consists of:

Doing the math, that’s approximately 30 hosts, but let’s round it up to 40 hosts for some extra breathing room. The challenge is to create subnets based on these host requirements and not just arbitrary network divisions.

Technical Breakdown

The first step in subnetting, based on host requirements, involves determining the number of host bits needed to support the required number of devices. Using the principle that the number of hosts is 2n – 2 (where n is the number of host bits), we can deduce the correct subnet mask.

Hosts Needed Host Bits (n) Subnet Mask Usable Host Range
40 6 255.255.255.192 26 – 2 = 62

Based on our requirements, we need to save (or reserve) 6 bits for hosts. Therefore, if we start with a /24 network, we need to convert it into a /26 network, which will provide us with 64 IP addresses per subnet, 62 of which are usable for hosts. In binary, the subnet mask for a /26 network is 11111111.11111111.11111111.11000000, which translates to 255.255.255.192 in decimal notation.

Subnet Allocation

With our subnet mask determined, we can now allocate subnets for each coffee shop. Since we are dealing with a /26 subnet, we will increment our networks by 64 for each subnet. Here’s how the networks for the three coffee shops would be divided:

Coffee Shop Subnet Usable IP Range Broadcast Address
1 10.1.1.0/26 10.1.1.1 – 10.1.1.62 10.1.1.63
2 10.1.1.64/26 10.1.1.65 – 10.1.1.126 10.1.1.127
3 10.1.1.128/26 10.1.1.129 – 10.1.1.190 10.1.1.191

Conclusion

Subnetting can initially seem daunting, but when you apply it to a real-world situation like setting up networks for coffee shops, it becomes much more approachable. By breaking down the requirements, calculating the number of needed host bits, and determining the subnet mask, we’ve successfully created a subnetting scheme that ensures each coffee shop has a network tailored to its specific needs. Remember, practice makes perfect, and the more you work with subnetting, the more intuitive it becomes. So keep brewing up those network designs!

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