AWS Global Network Backbone - How Private Submarine Cables and 600+ PoPs Deliver Superior Connectivity
Explore the advantages of AWS's global network built on private submarine cables, dedicated fiber, and 600+ edge locations, compared with GCP's Premium Tier and Azure's network design.
Cloud Performance Is Determined by the Network
When discussing cloud service performance, computing and storage tend to get the most attention, but it is the network that ultimately determines the user experience. No matter how fast the servers are, if the network between users and servers is slow, application response times suffer. If inter-Region data transfer is unreliable, the reliability of globally distributed systems degrades. AWS, Azure, and GCP all invest heavily in global networks, but their approaches and scale differ significantly.
AWS's Dedicated Network Infrastructure
AWS has built a dedicated global network connecting its Regions. This network consists of private fiber completely separated from the public internet, carrying only AWS traffic. Inter-Region communication travels over this private network, unaffected by internet congestion or routing changes. AWS also invests directly in submarine cables. By investing in laying intercontinental submarine cables and securing capacity on existing cables, AWS ensures bandwidth and redundancy between Regions. This investment, like data center construction, is based on multi-year plans that secure capacity ahead of demand growth. AWS's network connects Regions with redundant 100 Gbps fiber links, designed so that a single fiber cut does not interrupt service.
Comparison with GCP's Premium Tier
GCP's Premium Tier network is always mentioned in discussions about network quality. Google operates one of the world's largest private networks, and with GCP's Premium Tier, traffic travels within Google's network and exits from the PoP closest to the user. This minimizes the portion of the path that traverses the public internet, improving latency and reliability. GCP emphasizes this network quality as a differentiator, and it does show excellent results in latency and throughput benchmarks. However, AWS's network is built on the same design philosophy. AWS traffic also travels through AWS's private network whenever possible and is delivered to users from edge locations. The key difference is that GCP explicitly separates network quality into "Premium Tier" and "Standard Tier" with different pricing, while AWS uses a default design that routes all traffic through its private network. AWS has no network tier selection - all users get the high-quality network.
Scale and Capabilities of Edge Locations
AWS operates over 600 edge locations (PoPs) worldwide. This far exceeds Azure CDN's approximately 190 locations and takes a different approach from GCP's Cloud CDN (built on Google's global network). AWS edge locations provide more than just CloudFront CDN delivery - they integrate multiple functions. Route 53 DNS resolution happens at edge locations, responding from the nearest point to the user. AWS Shield DDoS protection also operates at the edge, filtering attack traffic before it reaches origin servers. Lambda@Edge and CloudFront Functions enable edge computing for authentication, redirects, header manipulation, A/B testing, and other logic. This multi-functional edge goes beyond simple CDN caching. Azure Front Door and GCP Cloud CDN offer similar capabilities, but AWS leads in the number of edge locations and the flexibility of edge computing.
Global Accelerator - Network Optimization via Anycast
AWS Global Accelerator is a service that directly leverages the advantages of AWS's global network. Using anycast IP addresses, it routes user traffic to the nearest AWS edge location, then forwards it to the origin through AWS's private network. By minimizing the portion of the path that traverses the public internet, it reduces latency and stabilizes network quality. Global Accelerator's benefits are especially pronounced in regions with unstable internet quality. In Southeast Asia, Africa, and South America, where ISP peering may be insufficient, public internet routing can be inefficient. Global Accelerator optimizes traffic from these regions through AWS's private network. Azure has Front Door and Traffic Manager, but Global Accelerator's Layer 4 anycast routing enables TCP/UDP-level optimization and supports non-HTTP protocols, providing a clear differentiator.
Direct Connect - Dedicated Connectivity Options
Direct Connect, which connects on-premises environments to AWS, is another pillar of AWS's network strategy. Direct Connect has over 100 locations worldwide and offers 1 Gbps, 10 Gbps, and 100 Gbps connection options. Azure ExpressRoute and GCP Cloud Interconnect offer similar services, but Direct Connect leads in the number of locations and the depth of its partner ecosystem. In Japan alone, there are multiple Direct Connect locations in Tokyo and Osaka, accessible through major data center operators such as Equinix, NTT Communications, and KDDI. With Direct Connect Gateway, a single Direct Connect connection can access VPCs across multiple Regions, enabling efficient dedicated connectivity to globally distributed workloads.
Network Quality Visibility and Monitoring
Network quality must not only be built but continuously monitored to detect issues early. AWS also provides comprehensive network quality visibility tools. CloudWatch Internet Monitor uses data collected from AWS's global network to monitor the performance and availability of internet-facing applications. VPC Flow Logs provide detailed network traffic logs, and Network Access Analyzer performs security analysis of network configurations. Reachability Analyzer verifies network path reachability and detects connectivity issues caused by misconfigurations before they impact users. The deep integration of these tools with AWS's network infrastructure is an advantage that third-party monitoring tools cannot match. To deepen your knowledge of network design, related books on Amazon are a helpful resource.
Summary
AWS's global network is built on multiple layers: direct investment in private fiber and submarine cables, 600+ edge locations, anycast routing via Global Accelerator, and 100+ Direct Connect locations. GCP's Premium Tier network is technically excellent, but AWS routes all traffic through its private network by default, eliminating the complexity of tier selection. Azure is also expanding its global network, but falls short of AWS in edge location count and Direct Connect location density. Network quality directly affects the perceived performance of cloud services, and AWS's continuous investment in network infrastructure is a source of long-term competitive advantage.