{"id":6632,"date":"2026-05-18T12:46:43","date_gmt":"2026-05-18T16:46:43","guid":{"rendered":"https:\/\/www.globesign.com\/blog\/?p=6632"},"modified":"2026-05-18T15:30:17","modified_gmt":"2026-05-18T19:30:17","slug":"what-is-aws-vpc-a-complete-beginners-guide-to-virtual-private-cloud-2026","status":"publish","type":"post","link":"https:\/\/www.globesign.com\/blog\/what-is-aws-vpc-a-complete-beginners-guide-to-virtual-private-cloud-2026\/","title":{"rendered":"What is AWS VPC? A Complete Beginner&#8217;s Guide to Virtual Private Cloud (2026)"},"content":{"rendered":"<h2><strong><span class=\"token-keyword\">Table of Contents<\/span><\/strong><\/h2>\n<ol>\n<li>What is AWS VPC?<\/li>\n<li>Why Do We Need a VPC?<\/li>\n<li>Key Components of AWS VPC<\/li>\n<li>What is a CIDR Block?<\/li>\n<li>What is a Subnet?<\/li>\n<li>Public Subnet vs Private Subnet<\/li>\n<li>What is an Internet Gateway?<\/li>\n<li>What is a Route Table?<\/li>\n<li>How Everything Connects Together<\/li>\n<li>Step-by-Step: Create Your Own VPC on AWS<\/li>\n<li>Common Mistakes Beginners Make<\/li>\n<li>Learning Outcomes<\/li>\n<li>What to Learn Next<\/li>\n<\/ol>\n<h2><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-6640\" src=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_vpc_banner.png\" alt=\"\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_vpc_banner.png 1536w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_vpc_banner-300x200.png 300w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_vpc_banner-1024x683.png 1024w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_vpc_banner-768x512.png 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/h2>\n<h2><strong>1. What is AWS VPC?<\/strong><\/h2>\n<p><strong>AWS VPC (Virtual Private Cloud)<\/strong> is your own private, isolated section of the AWS cloud where you can launch and manage your cloud resources \u2014 like servers, databases, and applications \u2014 in a network that <em>you<\/em> fully control.<\/p>\n<p>Think of it like this:<\/p>\n<blockquote><p>&#x1f3e2; Imagine AWS is a massive office building with thousands of rooms. A <strong>VPC is your own private floor<\/strong> in that building. You decide who gets in, where the doors are, and which rooms connect to the outside world.<\/p><\/blockquote>\n<p>Before VPC existed, every resource you launched on AWS was sitting in a shared, public network \u2014 meaning anyone could potentially reach it. That was risky and unprofessional for production workloads.<\/p>\n<p>AWS VPC solves that by giving you a <strong>dedicated, logically isolated network<\/strong> in the cloud where:<\/p>\n<ul>\n<li>You control the IP address ranges<\/li>\n<li>You decide what is public and what is private<\/li>\n<li>You define all traffic rules<\/li>\n<li>No other AWS customer can see or access your resources<\/li>\n<\/ul>\n<h2><strong>2. Why Do We Need a VPC?<\/strong><\/h2>\n<p>This is the question most beginners skip \u2014 and they shouldn&#8217;t.<\/p>\n<p>Here is a real-world example to make it click:<\/p>\n<p>Imagine you are building an <strong>e-commerce website<\/strong>. Your application has three layers:<\/p>\n<table>\n<thead>\n<tr>\n<th>Layer<\/th>\n<th>Component<\/th>\n<th>Should it be public?<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Frontend<\/td>\n<td>Web server (Nginx)<\/td>\n<td>&#x2705; Yes \u2014 users need to reach it<\/td>\n<\/tr>\n<tr>\n<td>Backend<\/td>\n<td>Application server<\/td>\n<td>&#x26a0;&#xfe0f; Maybe \u2014 only from web server<\/td>\n<\/tr>\n<tr>\n<td>Database<\/td>\n<td>MySQL \/ PostgreSQL<\/td>\n<td>&#x274c; Never \u2014 must be private<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Without a VPC, everything would sit in the same open network. Your database would be exposed to the internet \u2014 a massive security risk.<\/p>\n<p><strong>With a VPC<\/strong>, you separate these layers into different network zones:<\/p>\n<ul>\n<li>The web server goes into a <strong>public subnet<\/strong> (internet accessible)<\/li>\n<li>The database goes into a <strong>private subnet<\/strong> (no internet access)<\/li>\n<li>Traffic between them is controlled by rules you define<\/li>\n<\/ul>\n<p>This is why <strong>every production application on AWS uses a VPC<\/strong>. It is not optional \u2014 it is the foundation.<\/p>\n<h2><strong>3. Key Components of AWS VPC<\/strong><\/h2>\n<p>Before we go deeper, here is a quick overview of every component we will cover in this blog:<\/p>\n<pre><code>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\r\n\u2502                     AWS VPC                         \u2502\r\n\u2502                  (10.0.0.0\/16)                      \u2502\r\n\u2502                                                     \u2502\r\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u2502\r\n\u2502  \u2502  Public Subnet   \u2502   \u2502   Private Subnet      \u2502   \u2502\r\n\u2502  \u2502  (10.0.1.0\/24)   \u2502   \u2502   (10.0.2.0\/24)       \u2502   \u2502\r\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\r\n\u2502           \u2502                                         \u2502\r\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510                               \u2502\r\n\u2502  \u2502   Route Table    \u2502                               \u2502\r\n\u2502  \u2502  0.0.0.0\/0 \u2192 IGW \u2502                               \u2502\r\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                               \u2502\r\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\r\n            \u2502\r\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\r\n\u2502    Internet Gateway     \u2502\r\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\r\n            \u2502\r\n        &#x1f30d; Internet\r\n<\/code><\/pre>\n<table>\n<thead>\n<tr>\n<th>Component<\/th>\n<th>What It Does<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>VPC<\/strong><\/td>\n<td>The main private network container<\/td>\n<\/tr>\n<tr>\n<td><strong>CIDR Block<\/strong><\/td>\n<td>Defines the IP address range for the VPC<\/td>\n<\/tr>\n<tr>\n<td><strong>Public Subnet<\/strong><\/td>\n<td>A subnet connected to the internet via IGW<\/td>\n<\/tr>\n<tr>\n<td><strong>Private Subnet<\/strong><\/td>\n<td>A subnet with no internet access<\/td>\n<\/tr>\n<tr>\n<td><strong>Internet Gateway<\/strong><\/td>\n<td>The door between your VPC and the internet<\/td>\n<\/tr>\n<tr>\n<td><strong>Route Table<\/strong><\/td>\n<td>The traffic rulebook \u2014 tells packets where to go<\/td>\n<\/tr>\n<tr>\n<td><strong>Route Table Association<\/strong><\/td>\n<td>Links a subnet to a specific route table<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>4. What is a CIDR Block?<\/strong><\/h2>\n<p><strong>CIDR (Classless Inter-Domain Routing)<\/strong> is simply a way to define a range of IP addresses. It looks like this:<\/p>\n<pre><code>10.0.0.0\/16\r\n<\/code><\/pre>\n<p>Do not panic \u2014 it is simpler than it looks.<\/p>\n<p>The number after the <code>\/<\/code> tells you <strong>how many IP addresses are in the range<\/strong>:<\/p>\n<table>\n<thead>\n<tr>\n<th>CIDR<\/th>\n<th>Total IPs<\/th>\n<th>Common Use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>10.0.0.0\/8<\/code><\/td>\n<td>16,777,216<\/td>\n<td>Very large enterprise networks<\/td>\n<\/tr>\n<tr>\n<td><code>10.0.0.0\/16<\/code><\/td>\n<td>65,536<\/td>\n<td>Standard VPC size &#x2705;<\/td>\n<\/tr>\n<tr>\n<td><code>10.0.0.0\/24<\/code><\/td>\n<td>256<\/td>\n<td>Subnets inside a VPC<\/td>\n<\/tr>\n<tr>\n<td><code>10.0.0.0\/28<\/code><\/td>\n<td>16<\/td>\n<td>Very small subnets<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>For our VPC<\/strong>, we use <code>10.0.0.0\/16<\/code> \u2014 which gives us 65,536 IP addresses to work with. That is plenty of room to create many subnets inside.<\/p>\n<blockquote><p>&#x1f4a1; <strong>Simple rule:<\/strong> The bigger the number after <code>\/<\/code>, the <em>smaller<\/em> the network. <code>\/16<\/code> is bigger than <code>\/24<\/code>.<\/p><\/blockquote>\n<h2><img decoding=\"async\" class=\"aligncenter size-full wp-image-6642\" src=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_subnet.png\" alt=\"\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_subnet.png 1536w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_subnet-300x200.png 300w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_subnet-1024x683.png 1024w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_subnet-768x512.png 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/h2>\n<h2><strong>5. What is a Subnet?<\/strong><\/h2>\n<p>A <strong>subnet (sub-network)<\/strong> is a smaller network carved out from inside your VPC.<\/p>\n<p>Think of it like this:<\/p>\n<blockquote><p>&#x1f3d9;&#xfe0f; Your VPC is the entire city. A <strong>subnet is a specific neighborhood<\/strong> inside that city. Some neighborhoods are open to everyone (public). Some are gated and private.<\/p><\/blockquote>\n<p>Subnets let you:<\/p>\n<ul>\n<li><strong>Organize<\/strong> your resources by function (web, app, database)<\/li>\n<li><strong>Control security<\/strong> \u2014 apply different rules to different subnets<\/li>\n<li><strong>Separate concerns<\/strong> \u2014 public-facing resources vs internal resources<\/li>\n<\/ul>\n<p>Each subnet sits inside a specific <strong>Availability Zone (AZ)<\/strong> in AWS. For example, one subnet might be in <code>us-east-2a<\/code> and another in <code>us-east-2b<\/code>.<\/p>\n<p>In our project, we create two subnets inside the same VPC:<\/p>\n<pre><code>VPC: 10.0.0.0\/16\r\n  \u251c\u2500\u2500 Public Subnet:  10.0.1.0\/24  (256 IPs)\r\n  \u2514\u2500\u2500 Private Subnet: 10.0.2.0\/24  (256 IPs)\r\n<\/code><\/pre>\n<p>They do not overlap. They share the same VPC but serve completely different purposes.<\/p>\n<h2><strong>6. Public Subnet vs Private Subnet<\/strong><\/h2>\n<p>This is the most important concept in AWS VPC networking. Let us break it down clearly.<\/p>\n<h3><strong>&#x1f30d; Public Subnet<\/strong><\/h3>\n<p>A <strong>public subnet<\/strong> is a subnet whose traffic is routed to an <strong>Internet Gateway<\/strong>. Resources inside a public subnet can:<\/p>\n<ul>\n<li>Receive incoming traffic from the internet<\/li>\n<li>Send outgoing traffic to the internet<\/li>\n<li>Be assigned a public IP address<\/li>\n<\/ul>\n<p><strong>What lives in a public subnet?<\/strong><\/p>\n<ul>\n<li>Web servers (Nginx, Apache)<\/li>\n<li>Load balancers<\/li>\n<li>Bastion hosts (jump servers)<\/li>\n<li>NAT Gateways<\/li>\n<\/ul>\n<p>In our project, we set <code>map_public_ip_on_launch = true<\/code> on the public subnet. This means any EC2 instance you launch here <strong>automatically gets a public IP address<\/strong> \u2014 you do not have to assign one manually.<\/p>\n<pre><code>Public Subnet (10.0.1.0\/24)\r\n\u251c\u2500\u2500 Has a Route to Internet Gateway &#x2705;\r\n\u251c\u2500\u2500 map_public_ip_on_launch = true &#x2705;\r\n\u2514\u2500\u2500 Resources here ARE reachable from internet &#x2705;\r\n<\/code><\/pre>\n<h3><strong>&#x1f512; Private Subnet<\/strong><\/h3>\n<p>A <strong>private subnet<\/strong> has no route to an Internet Gateway. Resources inside it:<\/p>\n<ul>\n<li>Cannot be reached directly from the internet<\/li>\n<li>Cannot reach the internet on their own (unless a NAT Gateway is added)<\/li>\n<li>Are only accessible from within the VPC<\/li>\n<\/ul>\n<p><strong>What lives in a private subnet?<\/strong><\/p>\n<ul>\n<li>Databases (RDS, MongoDB)<\/li>\n<li>Application servers<\/li>\n<li>Internal microservices<\/li>\n<li>Cache layers (ElastiCache)<\/li>\n<\/ul>\n<p>In our project, the private subnet has no Internet Gateway route and no public IP assignment \u2014 making it completely isolated from the public internet.<\/p>\n<pre><code>Private Subnet (10.0.2.0\/24)\r\n\u251c\u2500\u2500 No Route to Internet Gateway &#x274c;\r\n\u251c\u2500\u2500 map_public_ip_on_launch = false &#x274c;\r\n\u2514\u2500\u2500 Resources here are NOT reachable from internet &#x2705;\r\n<\/code><\/pre>\n<h3><strong>Side-by-Side Comparison<\/strong><\/h3>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Public Subnet<\/th>\n<th>Private Subnet<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Internet Access<\/td>\n<td>&#x2705; Yes<\/td>\n<td>&#x274c; No<\/td>\n<\/tr>\n<tr>\n<td>Has Route to IGW<\/td>\n<td>&#x2705; Yes<\/td>\n<td>&#x274c; No<\/td>\n<\/tr>\n<tr>\n<td>Auto Public IP<\/td>\n<td>&#x2705; Yes (if enabled)<\/td>\n<td>&#x274c; No<\/td>\n<\/tr>\n<tr>\n<td>Use Case<\/td>\n<td>Web servers, Load balancers<\/td>\n<td>Databases, App servers<\/td>\n<\/tr>\n<tr>\n<td>Security Level<\/td>\n<td>Moderate<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>CIDR (our project)<\/td>\n<td><code>10.0.1.0\/24<\/code><\/td>\n<td><code>10.0.2.0\/24<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p>&#x1f510; <strong>Security principle:<\/strong> Never put your database in a public subnet. Ever. Always keep sensitive resources in a private subnet.<\/p><\/blockquote>\n<h2><img decoding=\"async\" class=\"aligncenter size-full wp-image-6643\" src=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_internet_gateway.png\" alt=\"\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_internet_gateway.png 1536w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_internet_gateway-300x200.png 300w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_internet_gateway-1024x683.png 1024w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_internet_gateway-768x512.png 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/h2>\n<h2><strong>7. What is an Internet Gateway?<\/strong><\/h2>\n<p>An <strong>Internet Gateway (IGW)<\/strong> is the component that connects your VPC to the internet.<\/p>\n<p>Without an Internet Gateway, your VPC is completely cut off from the outside world. It is like having a building with no doors to the street.<\/p>\n<blockquote><p>&#x1f6aa; Think of the <strong>Internet Gateway as the main entrance door<\/strong> of your private office building. It is the only way in and out for internet traffic.<\/p><\/blockquote>\n<p><strong>Key facts about Internet Gateways:<\/strong><\/p>\n<ul>\n<li>One VPC can only have <strong>one Internet Gateway<\/strong><\/li>\n<li>It is horizontally scaled, redundant, and highly available by default<\/li>\n<li>It does <strong>not<\/strong> limit bandwidth<\/li>\n<li>It is free \u2014 you only pay for data transfer, not the IGW itself<\/li>\n<li>Attaching it to the VPC is not enough \u2014 you must also <strong>add a route in the Route Table<\/strong><\/li>\n<\/ul>\n<p>In our project, we create one IGW named <code>ecommerce-igw<\/code> and attach it to <code>ecommerce-vpc<\/code>:<\/p>\n<pre><code>Internet Gateway: ecommerce-igw\r\n\u2514\u2500\u2500 Attached to: ecommerce-vpc &#x2705;\r\n\u2514\u2500\u2500 Referenced in: Route Table (0.0.0.0\/0 \u2192 ecommerce-igw)\r\n<\/code><\/pre>\n<blockquote><p>&#x26a0;&#xfe0f; <strong>Common mistake:<\/strong> Many beginners create an Internet Gateway and attach it to the VPC \u2014 then wonder why their EC2 instance still has no internet. The reason is they forgot to <strong>add the IGW to the Route Table<\/strong>. We cover this next.<\/p><\/blockquote>\n<h2><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-6644\" src=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_route_table.png\" alt=\"\" width=\"1369\" height=\"1149\" srcset=\"https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_route_table.png 1369w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_route_table-300x252.png 300w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_route_table-1024x859.png 1024w, https:\/\/www.globesign.com\/blog\/wp-content\/uploads\/2026\/05\/aws_route_table-768x645.png 768w\" sizes=\"(max-width: 1369px) 100vw, 1369px\" \/><\/h2>\n<h2><strong>8. What is a Route Table?<\/strong><\/h2>\n<p>A <strong>Route Table<\/strong> is a set of rules \u2014 called <strong>routes<\/strong> \u2014 that tell network traffic where to go.<\/p>\n<p>Every subnet in your VPC is associated with a Route Table. The Route Table looks at each packet of data and asks: <em>&#8220;Where should this go?&#8221;<\/em><\/p>\n<blockquote><p>&#x1f5fa;&#xfe0f; Think of a <strong>Route Table as a GPS system<\/strong> for your network traffic. You tell it: &#8220;If traffic is going to the internet, send it through the Internet Gateway.&#8221;<\/p><\/blockquote>\n<h3><strong>How Routes Work<\/strong><\/h3>\n<p>A route has two parts:<\/p>\n<table>\n<thead>\n<tr>\n<th>Part<\/th>\n<th>Description<\/th>\n<th>Example<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Destination<\/strong><\/td>\n<td>Where is the traffic going?<\/td>\n<td><code>0.0.0.0\/0<\/code> (anywhere)<\/td>\n<\/tr>\n<tr>\n<td><strong>Target<\/strong><\/td>\n<td>What should handle this traffic?<\/td>\n<td><code>igw-xxxxxxxx<\/code> (Internet Gateway)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><strong>The Two Routes in Our Route Table<\/strong><\/h3>\n<p>Our <code>ecommerce-public-rtb<\/code> has these routes:<\/p>\n<table>\n<thead>\n<tr>\n<th>Destination<\/th>\n<th>Target<\/th>\n<th>Added By<\/th>\n<th>Meaning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><code>10.0.0.0\/16<\/code><\/td>\n<td><code>local<\/code><\/td>\n<td>AWS (automatic)<\/td>\n<td>Traffic inside the VPC stays inside<\/td>\n<\/tr>\n<tr>\n<td><code>0.0.0.0\/0<\/code><\/td>\n<td><code>ecommerce-igw<\/code><\/td>\n<td>Us (manual)<\/td>\n<td>All other traffic goes to the internet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The <code>local<\/code> route is <strong>automatically added by AWS<\/strong> when you create the VPC. You never have to touch it.<\/p>\n<p>The <code>0.0.0.0\/0 \u2192 IGW<\/code> route is the one <strong>we add manually<\/strong> to enable internet access.<\/p>\n<h3><strong>What <code>0.0.0.0\/0<\/code> Means<\/strong><\/h3>\n<p><code>0.0.0.0\/0<\/code> means <strong>&#8220;match everything&#8221;<\/strong> \u2014 any IP address, anywhere in the world. It is the catch-all rule.<\/p>\n<p>So the route table logic works like this:<\/p>\n<pre><code>Packet arrives. Where is it going?\r\n\r\n  \u2192 Is it going to 10.0.0.0\/16? (somewhere inside our VPC)\r\n    \u2192 YES: Send it through \"local\" (internal routing) &#x2705;\r\n\r\n  \u2192 Is it going somewhere else? (the internet)\r\n    \u2192 YES: Send it to the Internet Gateway &#x2705;\r\n<\/code><\/pre>\n<h2><strong>9. How Everything Connects Together<\/strong><\/h2>\n<p>Now let us zoom out and see the <strong>complete picture<\/strong> of how all components work together:<\/p>\n<pre><code>&#x1f30d; Internet\r\n     \u2502\r\n     \u2502  (User types your website URL)\r\n     \u2502\r\n     \u25bc\r\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\r\n\u2502    Internet Gateway     \u2502  \u2190 The door between internet and your VPC\r\n\u2502      ecommerce-igw      \u2502\r\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\r\n             \u2502\r\n             \u2502  (IGW forwards traffic into the VPC)\r\n             \u2502\r\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\r\n\u2502       Route Table        \u2502  \u2190 Checks: where should this traffic go?\r\n\u2502   ecommerce-public-rtb   \u2502\r\n\u2502  0.0.0.0\/0 \u2192 ecommerce-igw \u2502\r\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\r\n             \u2502\r\n             \u2502  (Route Table says: send to public subnet)\r\n             \u2502\r\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25bc\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\r\n\u2502                  VPC \u2014 ecommerce-vpc                  \u2502\r\n\u2502                    10.0.0.0\/16                        \u2502\r\n\u2502                                                       \u2502\r\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   \u2502\r\n\u2502  \u2502    Public Subnet     \u2502  \u2502   Private Subnet     \u2502   \u2502\r\n\u2502  \u2502    10.0.1.0\/24       \u2502  \u2502    10.0.2.0\/24       \u2502   \u2502\r\n\u2502  \u2502                      \u2502  \u2502                      \u2502   \u2502\r\n\u2502  \u2502  &#x1f5a5;&#xfe0f; Web Server       \u2502  \u2502  &#x1f5c4;&#xfe0f; Database         \u2502   \u2502\r\n\u2502  \u2502  (Public IP: &#x2705;)      \u2502  \u2502  (Public IP: &#x274c;)     \u2502   \u2502\r\n\u2502  \u2502                      \u2502  \u2502                      \u2502   \u2502\r\n\u2502  \u2502  Reachable from      \u2502  \u2502  NOT reachable       \u2502   \u2502\r\n\u2502  \u2502  internet &#x2705;          \u2502  \u2502  from internet &#x2705;    \u2502   \u2502\r\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\r\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\r\n<\/code><\/pre>\n<p><strong>The traffic flow for a user visiting your website:<\/strong><\/p>\n<ol>\n<li>User types <code>www.yourstore.com<\/code> in their browser<\/li>\n<li>DNS resolves to your EC2 public IP in the <strong>public subnet<\/strong><\/li>\n<li>Request travels through the <strong>Internet Gateway<\/strong><\/li>\n<li><strong>Route Table<\/strong> checks the rules \u2014 routes traffic to the public subnet<\/li>\n<li><strong>Web server<\/strong> in the public subnet receives and processes the request<\/li>\n<li>Web server talks to the <strong>database in the private subnet<\/strong> (internal VPC traffic via <code>local<\/code> route)<\/li>\n<li>Database returns data to web server<\/li>\n<li>Web server sends response back to user through the same path<\/li>\n<\/ol>\n<p>The private subnet database is <strong>never directly exposed<\/strong> to the internet \u2014 only the web server in the public subnet communicates with it, from inside the VPC.<\/p>\n<h2><strong>10. Step-by-Step: Create Your Own VPC on AWS<\/strong><\/h2>\n<p>Now let us build this hands-on in the <strong>AWS Console<\/strong> \u2014 no code required.<\/p>\n<h3><strong>Step 1 \u2014 Sign in to AWS Console<\/strong><\/h3>\n<p>Go to <a href=\"https:\/\/console.aws.amazon.com\/\">https:\/\/console.aws.amazon.com<\/a> and sign in. Make sure you are in the correct region. For this guide, we use <strong>US East (Ohio) \u2014 us-east-2<\/strong>.<\/p>\n<blockquote><p>&#x1f4a1; Always check your region in the top-right corner of the AWS Console before creating resources.<\/p><\/blockquote>\n<h3><strong>Step 2 \u2014 Create the VPC<\/strong><\/h3>\n<ol>\n<li>In the search bar, type <strong>VPC<\/strong> and click on it<\/li>\n<li>In the left sidebar, click <strong>Your VPCs<\/strong><\/li>\n<li>Click the orange <strong>Create VPC<\/strong> button<\/li>\n<li>Fill in the details:<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Field<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Name tag<\/td>\n<td><code>ecommerce-vpc<\/code><\/td>\n<\/tr>\n<tr>\n<td>IPv4 CIDR block<\/td>\n<td><code>10.0.0.0\/16<\/code><\/td>\n<\/tr>\n<tr>\n<td>IPv6 CIDR block<\/td>\n<td>No IPv6 CIDR block<\/td>\n<\/tr>\n<tr>\n<td>Tenancy<\/td>\n<td>Default<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol start=\"5\">\n<li>Click <strong>Create VPC<\/strong><\/li>\n<\/ol>\n<p>&#x2705; Your VPC is created. You will see it listed with a VPC ID like <code>vpc-0abc123...<\/code><\/p>\n<h3><strong>Step 3 \u2014 Create the Public Subnet<\/strong><\/h3>\n<ol>\n<li>In the left sidebar, click <strong>Subnets<\/strong><\/li>\n<li>Click <strong>Create subnet<\/strong><\/li>\n<li>Select your VPC: <code>ecommerce-vpc<\/code><\/li>\n<li>Fill in subnet details:<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Field<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Subnet name<\/td>\n<td><code>ecommerce-public-subnet<\/code><\/td>\n<\/tr>\n<tr>\n<td>Availability Zone<\/td>\n<td><code>us-east-2a<\/code><\/td>\n<\/tr>\n<tr>\n<td>IPv4 CIDR block<\/td>\n<td><code>10.0.1.0\/24<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol start=\"5\">\n<li>Click <strong>Create subnet<\/strong><\/li>\n<\/ol>\n<p><strong>Enable Auto-assign Public IP:<\/strong><\/p>\n<p>After creation, select <code>ecommerce-public-subnet<\/code> \u2192 click <strong>Actions<\/strong> \u2192 <strong>Edit subnet settings<\/strong> \u2192 check <strong>Enable auto-assign public IPv4 address<\/strong> \u2192 Save.<\/p>\n<p>&#x2705; Your public subnet is ready. Any EC2 launched here will get a public IP automatically.<\/p>\n<h3><strong>Step 4 \u2014 Create the Private Subnet<\/strong><\/h3>\n<ol>\n<li>Click <strong>Create subnet<\/strong> again<\/li>\n<li>Select your VPC: <code>ecommerce-vpc<\/code><\/li>\n<li>Fill in subnet details:<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Field<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Subnet name<\/td>\n<td><code>ecommerce-private-subnet<\/code><\/td>\n<\/tr>\n<tr>\n<td>Availability Zone<\/td>\n<td><code>us-east-2a<\/code><\/td>\n<\/tr>\n<tr>\n<td>IPv4 CIDR block<\/td>\n<td><code>10.0.2.0\/24<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol start=\"4\">\n<li>Click <strong>Create subnet<\/strong><\/li>\n<\/ol>\n<blockquote><p>&#x26a0;&#xfe0f; Do <strong>NOT<\/strong> enable auto-assign public IP on this subnet. Leave it disabled \u2014 this subnet must stay private.<\/p><\/blockquote>\n<p>&#x2705; Your private subnet is ready. It has no internet access \u2014 exactly what we want.<\/p>\n<h3><strong>Step 5 \u2014 Create the Internet Gateway<\/strong><\/h3>\n<ol>\n<li>In the left sidebar, click <strong>Internet Gateways<\/strong><\/li>\n<li>Click <strong>Create internet gateway<\/strong><\/li>\n<li>Fill in the details:<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Field<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Name tag<\/td>\n<td><code>ecommerce-igw<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol start=\"4\">\n<li>Click <strong>Create internet gateway<\/strong><\/li>\n<\/ol>\n<p><strong>Attach the IGW to your VPC:<\/strong><\/p>\n<p>After creation, you will see a green banner saying &#8220;Attach to a VPC&#8221;. Click it \u2014 or go to <strong>Actions \u2192 Attach to VPC<\/strong> \u2192 select <code>ecommerce-vpc<\/code> \u2192 click <strong>Attach internet gateway<\/strong>.<\/p>\n<p>&#x2705; The IGW now says &#8220;Attached&#8221; next to <code>ecommerce-vpc<\/code>. But wait \u2014 this alone does not give internet access. You still need the Route Table.<\/p>\n<h3><strong>Step 6 \u2014 Create the Route Table<\/strong><\/h3>\n<ol>\n<li>In the left sidebar, click <strong>Route Tables<\/strong><\/li>\n<li>Click <strong>Create route table<\/strong><\/li>\n<li>Fill in the details:<\/li>\n<\/ol>\n<table>\n<thead>\n<tr>\n<th>Field<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Name<\/td>\n<td><code>ecommerce-public-rtb<\/code><\/td>\n<\/tr>\n<tr>\n<td>VPC<\/td>\n<td><code>ecommerce-vpc<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ol start=\"4\">\n<li>Click <strong>Create route table<\/strong><\/li>\n<\/ol>\n<p><strong>Add a route to the Internet Gateway:<\/strong><\/p>\n<p>After creation, select <code>ecommerce-public-rtb<\/code> \u2192 click the <strong>Routes<\/strong> tab \u2192 click <strong>Edit routes<\/strong> \u2192 click <strong>Add route<\/strong>:<\/p>\n<table>\n<thead>\n<tr>\n<th>Field<\/th>\n<th>Value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Destination<\/td>\n<td><code>0.0.0.0\/0<\/code><\/td>\n<\/tr>\n<tr>\n<td>Target<\/td>\n<td>Internet Gateway \u2192 <code>ecommerce-igw<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Click <strong>Save changes<\/strong>.<\/p>\n<p>&#x2705; The route table now knows: &#8220;Send all internet-bound traffic to the IGW.&#8221;<\/p>\n<h3><strong>Step 7 \u2014 Associate the Route Table with the Public Subnet<\/strong><\/h3>\n<p>Creating the Route Table is not enough \u2014 you must <strong>link it to the public subnet<\/strong>.<\/p>\n<ol>\n<li>Select <code>ecommerce-public-rtb<\/code><\/li>\n<li>Click the <strong>Subnet associations<\/strong> tab<\/li>\n<li>Click <strong>Edit subnet associations<\/strong><\/li>\n<li>Check <code>ecommerce-public-subnet<\/code><\/li>\n<li>Click <strong>Save associations<\/strong><\/li>\n<\/ol>\n<p>&#x2705; Done! The public subnet is now associated with the route table that has internet access.<\/p>\n<blockquote><p>&#x1f511; <strong>Key insight:<\/strong> The private subnet deliberately has NO association with this route table. It stays associated with the <strong>default VPC route table<\/strong> which only has the <code>local<\/code> route \u2014 meaning no internet access.<\/p><\/blockquote>\n<h3><strong>Step 8 \u2014 Verify Your Setup<\/strong><\/h3>\n<p>Here is a quick checklist to confirm everything is correctly configured:<\/p>\n<table>\n<thead>\n<tr>\n<th>Resource<\/th>\n<th>Name<\/th>\n<th>Status<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>VPC<\/td>\n<td><code>ecommerce-vpc<\/code> (10.0.0.0\/16)<\/td>\n<td>&#x2705; Created<\/td>\n<\/tr>\n<tr>\n<td>Public Subnet<\/td>\n<td><code>ecommerce-public-subnet<\/code> (10.0.1.0\/24)<\/td>\n<td>&#x2705; Public IP enabled<\/td>\n<\/tr>\n<tr>\n<td>Private Subnet<\/td>\n<td><code>ecommerce-private-subnet<\/code> (10.0.2.0\/24)<\/td>\n<td>&#x2705; No public IP<\/td>\n<\/tr>\n<tr>\n<td>Internet Gateway<\/td>\n<td><code>ecommerce-igw<\/code><\/td>\n<td>&#x2705; Attached to VPC<\/td>\n<\/tr>\n<tr>\n<td>Route Table<\/td>\n<td><code>ecommerce-public-rtb<\/code><\/td>\n<td>&#x2705; Route 0.0.0.0\/0 \u2192 IGW<\/td>\n<\/tr>\n<tr>\n<td>Route Table Association<\/td>\n<td>Public subnet linked<\/td>\n<td>&#x2705; Associated<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Your VPC architecture is complete! &#x1f389;<\/p>\n<h2><strong>11. Common Mistakes Beginners Make<\/strong><\/h2>\n<p>These are the top mistakes that cause frustration \u2014 now you know to avoid them:<\/p>\n<h3><strong>&#x274c; Mistake 1: Creating an IGW but not adding it to the Route Table<\/strong><\/h3>\n<p>Creating an Internet Gateway and attaching it to the VPC does not automatically give internet access. You <em>must<\/em> add <code>0.0.0.0\/0 \u2192 IGW<\/code> as a route in your Route Table. This trips up almost every beginner.<\/p>\n<h3><strong>&#x274c; Mistake 2: Creating a Route Table but forgetting to associate it with the subnet<\/strong><\/h3>\n<p>A Route Table with all the right rules does nothing if it is not associated with a subnet. The subnet will keep using the default route table.<\/p>\n<h3><strong>&#x274c; Mistake 3: Not enabling auto-assign public IP on the public subnet<\/strong><\/h3>\n<p>You create an EC2 in the public subnet but it has no public IP \u2014 so you cannot reach it. Always enable <code>map_public_ip_on_launch<\/code> on public subnets (or assign an Elastic IP manually).<\/p>\n<h3><strong>&#x274c; Mistake 4: Putting the database in the public subnet<\/strong><\/h3>\n<p>This is a serious security mistake. Databases should always go in the private subnet. They only need to communicate with your application server \u2014 not the internet.<\/p>\n<h3><strong>&#x274c; Mistake 5: Using overlapping CIDR blocks<\/strong><\/h3>\n<p>Your subnets cannot have overlapping IP ranges. <code>10.0.1.0\/24<\/code> and <code>10.0.1.128\/24<\/code> would overlap. Always plan your CIDR ranges before creating subnets.<\/p>\n<h2><strong>12. Learning Outcomes<\/strong><\/h2>\n<p>After reading this guide, you now understand:<\/p>\n<ul>\n<li>&#x2705; What AWS VPC is and why every production application needs one<\/li>\n<li>&#x2705; How CIDR blocks define IP address ranges for networks<\/li>\n<li>&#x2705; The difference between a public subnet and a private subnet<\/li>\n<li>&#x2705; What an Internet Gateway is and why it is not enough on its own<\/li>\n<li>&#x2705; How Route Tables direct traffic within and outside a VPC<\/li>\n<li>&#x2705; Why Route Table Association is the final step that makes it all work<\/li>\n<li>&#x2705; How to build a complete VPC from scratch in the AWS Console<\/li>\n<li>&#x2705; The most common mistakes beginners make \u2014 and how to avoid them<\/li>\n<\/ul>\n<h2><strong>13. What to Learn Next<\/strong><\/h2>\n<p>Now that you have a solid VPC foundation, here is your recommended learning path:<\/p>\n<table>\n<thead>\n<tr>\n<th>Topic<\/th>\n<th>What You Will Learn<\/th>\n<th>Difficulty<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>&#x1f504; <strong>NAT Gateway<\/strong><\/td>\n<td>Give private subnets outbound internet access (for updates\/patches)<\/td>\n<td>Beginner<\/td>\n<\/tr>\n<tr>\n<td>&#x1f510; <strong>Security Groups<\/strong><\/td>\n<td>Instance-level firewall rules (inbound\/outbound)<\/td>\n<td>Beginner<\/td>\n<\/tr>\n<tr>\n<td>&#x1f6e1;&#xfe0f; <strong>Network ACLs<\/strong><\/td>\n<td>Subnet-level stateless firewall rules<\/td>\n<td>Intermediate<\/td>\n<\/tr>\n<tr>\n<td>&#x1f5a5;&#xfe0f; <strong>EC2 in VPC<\/strong><\/td>\n<td>Launch servers inside your public and private subnets<\/td>\n<td>Beginner<\/td>\n<\/tr>\n<tr>\n<td>&#x1f30d; <strong>Multi-AZ Architecture<\/strong><\/td>\n<td>Spread subnets across Availability Zones for high availability<\/td>\n<td>Intermediate<\/td>\n<\/tr>\n<tr>\n<td>&#x2696;&#xfe0f; <strong>Load Balancer (ALB)<\/strong><\/td>\n<td>Distribute traffic across multiple EC2 instances<\/td>\n<td>Intermediate<\/td>\n<\/tr>\n<tr>\n<td>&#x1f50c; <strong>VPC Peering<\/strong><\/td>\n<td>Connect two VPCs together privately<\/td>\n<td>Advanced<\/td>\n<\/tr>\n<tr>\n<td>&#x1f4e6; <strong>Terraform + VPC<\/strong><\/td>\n<td>Automate this entire setup with Infrastructure as Code<\/td>\n<td>Intermediate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>Final Thoughts<\/strong><\/h2>\n<p>AWS VPC is the <strong>single most important networking concept<\/strong> in cloud computing. Every other AWS service \u2014 EC2, RDS, ECS, Lambda in VPC \u2014 depends on it.<\/p>\n<p>The good news is: once you understand the relationship between <strong>VPC \u2192 Subnets \u2192 Internet Gateway \u2192 Route Tables<\/strong>, everything else in AWS networking starts to make sense.<\/p>\n<p>You have built the foundation. Keep building. &#x1f680;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents What is AWS VPC? Why Do We Need a VPC? Key Components of AWS VPC What is a CIDR Block? What is a Subnet? Public Subnet vs Private Subnet What is an Internet Gateway? What is a Route Table? How Everything Connects Together Step-by-Step: Create Your Own VPC on AWS Common Mistakes [&hellip;]<\/p>\n","protected":false},"author":24,"featured_media":6652,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[251],"tags":[],"class_list":["post-6632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aws"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AWS VPC Guide: Best Beginner Cloud Setup<\/title>\n<meta name=\"description\" content=\"Learn AWS VPC basics, subnets, and cloud security in this beginner guide. 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