> For the complete documentation index, see [llms.txt](https://docs.plenit.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.plenit.com/docs-en/productos/servers/how-to/how-to-create-a-vpc-and-associate-a-tier.md).
# How to Create a VPC and Associate a TIER in Plenit
A VPC lets you organize the network of your Server environment into separate subnets, called TIERs.
In this tutorial, you create a VPC and associate its first TIER, the foundation for layering segmentation (application, database) or for setting up a VPN between networks later.
> #### 👍 What you get
>
> A created VPC network with an associated TIER, ready for your servers to connect to it and for you to define access from outside.
### What a VPC is and what a TIER is
A VPC is defined with a **Super CIDR**, the main network that contains all the subnets. Each subnet is a **TIER**, which corresponds to a VLAN. All the TIERs in a VPC communicate with each other and with the Internet through a virtual router.
| Concept | What it is |
| -------------- | ------------------------------------------------------------------------------------ |
| Super CIDR | The global range of the VPC, within which the TIERs live (for example `10.1.0.0/16`) |
| TIER | A subnet within the VPC (for example `10.1.0.0/24`) |
| Virtual router | What connects the TIERs to each other and to the Internet |
> #### 📘 Why segment into TIERs
>
> Separating the application layer from the database layer into different TIERs lets you control what talks to what, instead of having everything on a flat network.
>
> A VPC supports up to three TIERs on the same virtual router.
### Before you begin
* Have an active Server subscription.
* If you don't have one yet, deploy a server first: [Deploy your server.](/docs-en/productos/servers/quickstart.md)
### Step 1. Access the Server subscription
Enter the Server subscription from its card in the service.
### Step 2. Open Networks/IP and create the VPC network
In the fields below your server name, open **Networks/IP**, select **VPC Networks** and click **Create VPC network**.
### Step 3. Name and locate the VPC
Enter a name to identify it easily, for example `VPC1`. Then add the location where you want to deploy this network.
If you leave it empty, we generate it automatically. Click **Continue**.
> #### 📘 The Super CIDR, auto-generated but yours
>
> We generate the Super CIDR automatically, but you can change it. If you do, note the range: the TIERs you create later must fit within it.
### Step 4. Add and name a TIER
When the VPC is created, you'll see a notice that it still doesn't contain any TIERs. Click the **three dots** on the VPC and choose **Add Tier**. Enter a name, for example `TIER1`. If you leave it empty, we'll fill it in for you.
The platform assigns a range by default `10.1.0.0/24`, which is contained within the Super CIDR `10.1.0.0/16`. When you're done, the VPC and its TIER appear in **Networks/IP → VPC Networks**.
> #### 👍 Use clear names from the start
>
> Naming VPCs and TIERs well (by function or by layer) saves you time when the network grows and you need to know at a glance what each thing is.
### Check the network from a server
When you connect a server to the TIER, confirm from inside that it has received the correct IP and gateway.
On Linux:
```shell
ip addr show # the IP and mask assigned to the server
ip route # the gateway (the virtual router)
```
On Windows, from PowerShell or CMD:
```powershell
ipconfig /all
```
To check connectivity with another server on the network, run `ping` to its IP. On Windows, the firewall blocks incoming ICMP by default, so allow it on the destination server with an inbound rule:
```powershell
New-NetFirewallRule -DisplayName "ICMPv4-In" -Protocol ICMPv4 -IcmpType 8 -Direction Inbound -Action Allow
```
### Plan ranges before growing
The biggest oversight when setting up multiple VPCs is overlapping ranges, which breaks routing as soon as you connect them. Reserve a different Super CIDR per VPC from the start.
| Item | VPC1 | VPC2 |
| ------------ | ------------- | ------------- |
| Super CIDR | `10.1.0.0/16` | `10.2.0.0/16` |
| example TIER | `10.1.0.0/24` | `10.2.0.0/24` |
### Next steps
* To connect two VPCs, create a second one (for example `VPC2` with `10.2.0.0/16`, without overlapping) and bring up the tunnel: [How to create a site-to-site VPN tunnel.](/docs-en/productos/servers/how-to/how-to-create-a-site-to-site-vpn-tunnel.md)
* The VPC is the only network type with site-to-site IPSec VPN, and you can connect it with VPCs from other cloud providers or with compatible equipment (Cisco ISR with IOS 12.4 or higher, Juniper J-Series routers with JunOS 9.5 or higher).
* To review the network types: [Server networks.](/docs-en/productos/servers/concepts/networks.md)
---
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