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[Cyberpedia](https://www.paloaltonetworks.com/cyberpedia?ts=markdown) 2. [Cloud Security](https://www.paloaltonetworks.com/cyberpedia/cloud-security?ts=markdown) 3. [VPN Setup \& Operations](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn?ts=markdown) 4. [What Is a Transit Virtual Private Cloud (VPC)?](https://www.paloaltonetworks.com/cyberpedia/what-is-a-transit-virtual-private-cloud?ts=markdown) Table of contents * [How to Set Up a Virtual Private Network (VPN)?](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn?ts=markdown) * [Step 1: Align Essential VPN Components.](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step1?ts=markdown) * [Step 2: Prepare the Network.](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step2?ts=markdown) * [Step 3: Initiate Client Installation.](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step3?ts=markdown) * [Step 4: Consult Configuration Guidance.](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step4?ts=markdown) * [Step 5: Log Into the VPN.](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step5?ts=markdown) * [Step 6: Select the VPN Protocol.](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step6?ts=markdown) * [Step 7: Troubleshoot Potential Issues.](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step7?ts=markdown) * [](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#step8?ts=markdown) * [How Does a VPN Work? FAQs](https://www.paloaltonetworks.com/cyberpedia/how-to-set-up-a-vpn#faqs?ts=markdown) * [What is Quality of Service?](https://www.paloaltonetworks.com/cyberpedia/what-is-quality-of-service-qos?ts=markdown) * [How QoS Technologies Work](https://www.paloaltonetworks.com/cyberpedia/what-is-quality-of-service-qos#how?ts=markdown) * [Benefits of QoS](https://www.paloaltonetworks.com/cyberpedia/what-is-quality-of-service-qos#benefits?ts=markdown) * [QoS Use Cases](https://www.paloaltonetworks.com/cyberpedia/what-is-quality-of-service-qos#qos?ts=markdown) * [How to Implement QoS](https://www.paloaltonetworks.com/cyberpedia/what-is-quality-of-service-qos#implement?ts=markdown) * [QoS Best Practices](https://www.paloaltonetworks.com/cyberpedia/what-is-quality-of-service-qos#best?ts=markdown) * [QoS FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-quality-of-service-qos#faqs?ts=markdown) * [What Is Network Segmentation?](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation?ts=markdown) * [The Trust Assumption](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation#the?ts=markdown) * [The Zero Trust Response](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation#zero?ts=markdown) * [Use Cases](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation#usecases?ts=markdown) * [Physical vs. Logical Segmentation](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation#physical?ts=markdown) * [Benefits of Network Segmentation](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation#benefits?ts=markdown) * [Network Segmentation FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation#faqs?ts=markdown) * What Is a Transit Virtual Private Cloud (VPC)? * [What is a Data Center?](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center?ts=markdown) * [The Role of the Data Center](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center#the?ts=markdown) * [Types of Data Centers](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center#types?ts=markdown) * [Core Components of a Data Center](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center#core?ts=markdown) * [Defining the Modern Data Center](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center#defining?ts=markdown) * [Data Center Security Considerations](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center#data?ts=markdown) * [Data Center FAQs](https://www.paloaltonetworks.com/cyberpedia/what-is-a-data-center#faqs?ts=markdown) # What Is a Transit Virtual Private Cloud (VPC)? 5 min. read A transit VPC is a gateway architecture used to connect geographically dispersed VPCs or VNets to each other and remote networks. Transit VPCs simplify network architecture, reduce operational overhead, and minimize network traffic between the cloud service provider (CSP) and corporate data center by locating services close to the VPCs. **The Need for Transit VPC** Organizations are rapidly migrating enterprise applications and data to Google Cloud, Amazon Web Services (AWS®), Microsoft Azure® and other CSPs. Few enterprises choose to eliminate their existing data centers, instead forming hybrid clouds consisting of on-premises and CSP resources. This hybrid approach gives network managers the flexibility to dynamically balance cost, security and capacity requirements. One issue in hybrid cloud design is deciding on a method for interconnecting VPCs. Small deployments often use a full-mesh architecture in which each VPC connects to all others as peers. As the number of VPCs grows, the number of peering connections between VPCs increases exponentially. For example, five VPCs require just 10 interconnections, but doubling the number of VPCs to 10 more than quadruples the number of connections to 45. For large enterprises with hundreds or even thousands of VPCs, the full-mesh approach is impractical. Another potential problem is the bottleneck that occurs when organizations rely exclusively on services, especially firewalls, located in the data center. Securing VPCs in a service provider's cloud requires significant backhaul traffic between the CSP and the data center, a configuration that is inefficient and difficult to scale. Network architects need a way to move firewall services closer to the VPCs while retaining the ability to manage the entire security fabric from a central location. **How a Transit VPC Works** A transit VPC uses a hub-and-spoke architecture in which each spoke VPC is attached to the hub transit VPC via an IPsec tunnel. For redundancy, the transit VPC contains twin virtual firewalls cross-connected to each VPC (see figure 1). The virtual firewalls inspect traffic based on local policies (e.g., only users in the IT domain can initiate FTP transfers or start remote terminal sessions). Network administrators can manage policies for the virtual firewalls from a centralized management system, avoiding the need for multiple consoles. This gateway approach routes traffic between VPCs using transit gateway routing tables, eliminating the need for peer interconnections. The use of a transit VPC can also reduce or remove the fees many CSPs charge for VPC peering connections that cross regional boundaries. ![](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/vpc-1.png) Figure 1: Transit VPC architecture **Scaling the Transit VPC** Transit VPCs avoid the scaling problems associated with full-mesh architecture, in which the number of interconnections grows exponentially as VPCs are added. In a transit VPC architecture, each VPC requires just two connections, so the number of connections increases linearly. Virtual firewalls have a finite number of possible connections, but additional firewalls can be added as needed (see figure 2). ![](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/cyberpedia/vpc-2.png) Figure 2: Transit VPC supporting twice the number of VPCs and virtual firewalls **Use Cases** The transit VPC architecture supports a range of important use cases, including: * Private networking: An organization can build a private network that spans two or more CSP regions. * Shared connectivity: Multiple VPCs can share connections to data centers, partner networks and other clouds. * Cross-account usage: VPCs and the resources within them can reside in multiple CSP accounts. **Benefits** The advantages of a transit VPC architecture include: * Simplified connectivity: As noted, the number of peer connections grows exponentially as VPCs are added. Hub-and-spoke architecture minimizes the number of required connections both between VPCs and to remote networks. * Streamlined management: Global enterprise applications tend to be distributed across multiple cloud locations, providers and enterprise networks. Integrating them into a transit VPC architecture brings them under a single homogeneous network management framework. * Simplified visibility and network control: Global enterprises often rely on VPCs located in different CSP regions. The gateway model supports centralized management so network administrators can manage all VPCs and edge connections from a single console. * Seamless scalability: The transit VPC scales simply by adding more virtual firewalls to the transit VPC. Automated tools offered by top-tier firewall vendors can even perform the necessary configuration and interconnection tasks with no human intervention. Please [visit our website](https://www.paloaltonetworks.com/network-security/vm-series-for-public-clouds?ts=markdown) for more information about transit VPC architecture. RELATED CONTENT [How to Bring Zero-Trust to the Public Cloud Learn how the roles a Zero Trust approach and virtual firewalls play in protecting applications, data, runtimes, middleware, and operating systems in the cloud.](https://www.paloaltonetworks.com/resources/ebooks/zero-trust-and-public-cloud-security?ts=markdown) [Cloud NGFW for AWS---Take a Self-Guided Tour See how to attain best-in-class network security purpose-built for AWS deployments with an interactive tour of Cloud NGFW's procurement, setup, and deployment.](https://www.paloaltonetworks.com/resources/infographics/cloud-ngfw-for-aws?ts=markdown) [Get Network Security with Cloud Ease of Use Understand how virtual firewalls improve security to secure public clouds, extend security to branches and SDN environments and safeguard private cloud assets.](https://www.paloaltonetworks.com/resources/whitepapers/cloud-ngfw-solution-brief?ts=markdown) [Learn VM-Series Virtual Firewall Essentials Find out how virtualized instances of Next-Generation Firewall secure public clouds, private clouds, software-defined networks (SDN), and branch locations.](https://www.paloaltonetworks.com/resources/techbriefs/secure-all-your-virtualized-environments?ts=markdown) ![Share page on facebook](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/facebook-circular-icon.svg) ![Share page on linkedin](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/linkedin-circular-icon.svg) [![Share page by an email](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/resources/email-circular-icon.svg)](mailto:?subject=What%20Is%20a%20Transit%20Virtual%20Private%20Cloud%20%28VPC%29%3F&body=Understand%20how%20a%20transit%20VPC%20acts%20as%20a%20gateway%20architecture%2C%20connecting%20geographically%20dispersed%20VPCs%20or%20VNets%20to%20enable%20seamless%20remote%20network%20integration.%20at%20https%3A//www.paloaltonetworks.com/cyberpedia/what-is-a-transit-virtual-private-cloud) Back to Top [Previous](https://www.paloaltonetworks.com/cyberpedia/what-is-network-segmentation?ts=markdown) What Is Network Segmentation? 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