Subnetting Like a Boss
Part 3 of Networking Series

Subnetting Like a Boss

Hi everyone! Welcome back to the last part 3 of the networking series, "Subnetting Like a Boss." I'm your local Cloud Whistler, here to guide you through the fascinating world of subnetting. Congratulations to all who have followed along with the articles and videos. I hope they were super helpful for you. This article on subnetting will be followed by a video, simplifying the process just like a senior engineer would train you in a company. We'll use subnet cheat sheets and make it short and empowering, so you can not only learn but also educate your juniors and help colleagues.


Index:

  1. Introduction
  2. What is Subnetting?
  3. Why Subnetting is Essential for Cloud Engineers and Architects
  4. Understanding IP Addresses and Subnet Masks
  5. How to Calculate Subnets and Hosts
  6. IT Scenarios for Subnetting
  7. Step-by-Step Subnetting Process
  8. Subnetting Cheat Sheet
  9. Summary
  10. What’s Next? Part 3 Teaser


What is Subnetting?

Subnetting is the process of dividing a large network into smaller, more manageable subnetworks or subnets. It helps optimize network performance and improve security. By using subnetting, network administrators can allocate IP addresses more efficiently, avoid IP conflicts, and enhance network organization.


Why Subnetting is Essential for Cloud Engineers and Architects

Subnetting is crucial for cloud engineers and architects for several reasons:

  1. Efficient IP Address Management: Helps in better utilization of IP addresses.
  2. Improved Network Performance: Reduces congestion by dividing networks into smaller, manageable subnets.
  3. Enhanced Security: Limits the broadcast domain, reducing the risk of network attacks.
  4. Scalability: Allows easy expansion and management of networks as organizations grow.


Understanding IP Addresses and Subnet Masks

An IP address is a unique identifier for devices on a network. It's divided into two parts: the network portion and the host portion. The subnet mask helps determine which part of the IP address refers to the network and which part refers to the host.

For example, in the IP address 192.168.1.0 with a subnet mask of 255.255.255.0:

  • 192.168.1 is the network portion.
  • 0 is the host portion.


How to Calculate Subnets and Hosts

To calculate subnets and hosts, you need to understand the concept of CIDR (Classless Inter-Domain Routing) notation. CIDR notation is a compact representation of an IP address and its associated network mask.

For example, 192.168.1.0/24:

  • 192.168.1.0 is the network address.
  • /24 indicates that the first 24 bits are the network part, and the remaining bits are for hosts.

Here’s a step-by-step guide to calculate subnets and hosts:

  1. Identify the Subnet Mask: Convert the CIDR notation to the subnet mask.
  2. Calculate the Number of Subnets: Use the formula 2^n, where n is the number of bits borrowed from the host portion for subnetting.
  3. Calculate the Number of Hosts per Subnet: Use the formula 2^h - 2, where h is the number of host bits.


IT Scenarios for Subnetting

  1. Corporate Network Segmentation: In a large corporation, subnetting can segment departments (e.g., HR, IT, Finance) to improve security and performance.
  2. Cloud Network Design: In cloud environments like AWS, subnetting helps create isolated environments for different applications, improving security and traffic management.
  3. Educational Institutions: Schools and universities can use subnetting to manage networks for different buildings or campuses, ensuring smooth and secure connectivity.


Step-by-Step Subnetting Process

  1. Determine the Network Requirements: Identify the number of subnets and hosts needed.
  2. Choose the Appropriate Subnet Mask: Based on the requirements, select a subnet mask that provides enough subnets and hosts.
  3. Calculate Subnet Ranges: Determine the range of IP addresses for each subnet.
  4. Assign Subnets: Allocate subnets to different departments, servers, or applications.

Example:

IP Address: 192.168.32.0/24

To create 4 subnets:

  1. Borrow 2 bits from the host portion, giving you a subnet mask of /26 (255.255.255.192).
  2. Calculate the subnets: 2^2 = 4 subnets.
  3. Calculate the hosts per subnet: 2^6 - 2 = 62 hosts.

Subnets:

  • 192.168.32.0 - 192.168.32.63
  • 192.168.32.64 - 192.168.32.127
  • 192.168.32.128 - 192.168.32.191
  • 192.168.32.192 - 192.168.32.255


Subnetting Cheat Sheet

CIDR Notation and Subnet Masks:

Cheat Sheet

Subnet Calculation Example:

IP Address: 192.168.1.0/24

To create 4 subnets:

  1. Borrow 2 Bits: /24 becomes /26.
  2. Subnet Mask: 255.255.255.192.
  3. Number of Subnets: 2^2 = 4.
  4. Hosts per Subnet: 2^6 - 2 = 62.

Subnets:

  • 192.168.1.0 - 192.168.1.63
  • 192.168.1.64 - 192.168.1.127
  • 192.168.1.128 - 192.168.1.191
  • 192.168.1.192 - 192.168.1.255


Summary

Subnetting is a vital skill for anyone working in the cloud industry. It allows efficient IP address management, enhances network performance, and improves security. By understanding and applying subnetting, you can design and manage networks effectively, ensuring smooth and secure operations. Remember, practice makes perfect, so keep experimenting with different subnetting scenarios to master this essential skill.

What’s Next? Part 3 Teaser

Get ready for Part 3: "Subnetting Like a Boss." In the upcoming article and video, I'll break down subnetting further, using cheat sheets and real-world examples. We'll dive deep into subnetting calculations, helping you become proficient in this critical aspect of network management. Stay tuned for more exciting and educational content!

Stay tuned, and happy learning! #CloudWhistler #CloudNetworking #IPv4mastery #TechMadeEasy #CloudEngineerJourney

Sateesh Pabbathi

Helping IT Professionals level up their careers. Let's connect [email protected]

10 个月

Great resource for anyone looking to improve their networking skills! Excited to check out the cheat sheet and video guide. #SubnettingLikeABoss #NetworkingMastery

Parna Mehta

AWS Cloud specialist - Helping you embark on your Cloud Journey

10 个月

The subnet calculation part is interesting to know!

Neal K. Davis

I've helped over 1 million cloud enthusiasts build hands-on skills and elevate their careers ?? Founder of Digital Cloud Training | AWS Community Builder | Cloud Solutions Architect | Udemy Instructor Partner

10 个月

Keep doing awesome, A Sohail! Excellent article. ??

Brandy Gordon MS, PhD(c), MCFE, CSO

CSO | Certified Digital Forensic Examiner ?? Doctoral Researcher| Cybersecurity Analyst| Malware/Reverse Engineer| Founder| DFIR investigator| Expert Witness| Assisting in IT Audits and Litigations ? Let's Talk Security

10 个月

interesting!

Sana M.

??2x Gold Medalist | Solutions Engineer | Genesys | Linux System Administrator | Incident Response | Information Security | Threat Intelligence | Open Source Intelligence | Security Compliance

10 个月

This is amazing, you have helped me to understand this difficult concept struggling with since a long time, THANK YOU for simplifying it, em looking forward with the video.. ???

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