Overview

In this lab, you design and implement a classic hub-and-spoke network topology. Your pre-configured environment includes three VPC networks—a central hub and two branches (spoke1 and spoke2). You will create virtual machines (VMs) on each network to test connectivity.

You begin by verifying connectivity between the VMs within and across VPCs. Then, you use NCC to implement a hub and spoke. You retest connectivity to confirm that your hub-and-spoke architecture is fully functional.

Objectives

In this lab, you learn how to perform the following tasks:

• Configure VMs in different VPCs.
• Test connectivity between networks before implementing a hub and spoke.
• Use NCC to create a hub and spoke.
• Test connectivity after implementing a hub and spoke.
• Use Network Topology to view metrics for traffic between entities.

Setup and requirements

For each lab, you get a new Google Cloud project and set of resources for a fixed time at no cost.

1. Click the Start Lab button. If you need to pay for the lab, a pop-up opens for you to select your payment method. On the left is the Lab Details panel with the following:

   • The Open Google Cloud console button
   • Time remaining
   • The temporary credentials that you must use for this lab
   • Other information, if needed, to step through this lab

2. Click Open Google Cloud console (or right-click and select Open Link in Incognito Window if you are running the Chrome browser).

   The lab spins up resources, and then opens another tab that shows the Sign in page.

   Tip: Arrange the tabs in separate windows, side-by-side.

   Note: If you see the Choose an account dialog, click Use Another Account.

3. If necessary, copy the Username below and paste it into the Sign in dialog.

   {{{user_0.username | "Username"}}}

   You can also find the Username in the Lab Details panel.

4. Click Next.

5. Copy the Password below and paste it into the Welcome dialog.

   {{{user_0.password | "Password"}}}

   You can also find the Password in the Lab Details panel.

6. Click Next.

   Important: You must use the credentials the lab provides you. Do not use your Google Cloud account credentials. Note: Using your own Google Cloud account for this lab may incur extra charges.

7. Click through the subsequent pages:

   • Accept the terms and conditions.
   • Do not add recovery options or two-factor authentication (because this is a temporary account).
   • Do not sign up for free trials.

After a few moments, the Google Cloud console opens in this tab.

Note: To view a menu with a list of Google Cloud products and services, click the Navigation menu at the top-left, or type the service or product name in the Search field.

Task 1. Explore the pre-configured network

The network hub-vpc with hub-subnet, spoke1-vpc with spoke1-subnet, and spoke2-vpc with spoke2-subnet along with firewall rules for RDP, SSH, and ICMP traffic have been configured for you.

• In the Google Cloud console, in the Navigation menu (), click VPC network > VPC networks.
  Notice the hub-vpc, spoke1-vpc, and spoke2-vpc network with its subnets: hub-subnet, spoke1-subnet, and spoke2-subnet.

  Each Google Cloud project starts with the default network. In addition, the hub-vpc, spoke1-vpc, and spoke2-vpc network has been created for you as part of your network diagram.

  You create a VM in hub-subnet, spoke1-subnet, and spoke2-subnet.

Explore the firewall rules

1. On the Navigation menu (), click VPC network > Firewall.
   Notice the app-allow-icmp and app-allow-ssh-rdp firewall rules.

   These firewall rules have been created for you.

Task 2. Create a VM in each VPC

1. On the Navigation menu, click Compute Engine > VM instances.
2. Click Create Instance.
3. Specify Name as hub-vm.
4. In the left frame, click Networking.
5. Under Network interfaces , click default. From the Network dropdown select hub-vpc.
6. Click Create.

Repeat the process to create a spoke1-vm VM in spoke1-vpc and a spoke2-vm VM in spoke2-vpc.

Click Check my progress to verify the objective. Create a VM in each VPC

Task 3: Test connectivity

spoke1-vm and spoke2-vm are in two different VPCs. Let us test the connectivity between the two.

1. On the VM instances page, for spoke1-vm, copy the internal IP address.
2. On the VM instances page, for spoke2-vm, click SSH.
3. Run the following command:

ping <internal IP address of spoke1-vm>

Notice how the ping fails. This should execute and display 100% packet loss. Press Ctrl+C to stop the command.

3. Now, SSH into spoke1-vm to test the connectivity from spoke1-vm to spoke2-vm:

ping <internal IP address of spoke2-vm>

Notice how the ping fails. This should execute and display 100% packet loss. Press Ctrl+C to stop the command.

Task 4: Create a hub and spoke using NCC

Network Connectivity Center lets you create VPC spokes to connect VPC networks together for full mesh connectivity.

1. On the Google Cloud console title bar, type Network Connectivity Center in the Search field, then click Network Connectivity Center in the Products & Page section.
2. Click Create hub.
3. Enter my-hub for Hub Name.
4. Click Next step.
5. Click Add a spoke.
6. Enter spoke1 for first Spoke Name.
7. Select VPC network as the Spoke type.
8. To add a VPC network to the spoke, select spoke1-vpc.
9. Click Done.
10. Click Add a spoke to add a second spoke,
11. Enter spoke2 for second Spoke Name.
12. Select VPC network as the Spoke type.
13. Choose spoke2-vpc as the VPC network for this spoke.
14. Click Done.
15. When you have finished adding spokes, click Create.

Click Check my progress to verify the objective. Create a hub and spoke using NCC

Task 5. Retest connectivity

VPC spokes reduce the operational complexity of managing the individual pair-wise VPC Network Peering connections through the use of VPC spokes and a centralized connectivity management model. Now you retest the connectivity between the VMs from spokes.

This task has been performed for you at the start of this lab. You will need to SSH into VM and run the following command to setup the environment.

1. On the Navigation menu, click Compute Engine > VM instances.

2. Select the SSH button next to spoke1-vm to SSH into the VM.

3. If prompted "Allow SSH-in-browser to connect to VMs," click Authorize.

4. Run the following command:

ping -c 3 <internal IP address of spoke2-vm>

5. Repeat the previous steps for spoke2-vm.

Task 6. Explore the Network Topology Tool

Network Topology is a visualization tool that shows the topology of your network infrastructure. You can also view metrics and details of network traffic to other Shared VPC networks and inter-region traffic.

For each Network Topology hierarchy, the Google Cloud console displays a single metric for Compute Engine virtual machine (VM) instance entities and region entities, as well as for connections.

1. On the Google Cloud console title bar, type Network Topology in the Search field, then click Network Topology in the Products & Page section.
2. Hover over an entity to display the Expand icon for expanding or Collapse icon for collapsing.
3. In the Metrics and insights section, select an insight from the options.

Congratulations!

In this lab, you implemented a classic hub-and-spoke network topology. You created virtual machines (VMs) on each network to test connectivity.

You started by verifying connectivity between the VMs within and across VPCs. Then, you used NCC to implement a hub and spoke. You retested connectivity to confirm that the hub-and-spoke architecture was fully functional.

End your lab

When you have completed your lab, click End Lab. Google Cloud Skills Boost removes the resources you’ve used and cleans the account for you.

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