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Difficulty: EasyHigh-Performing and Scalable Network Architectures

A company is connecting its on-premises data center to an AWS VPC using a single AWS Site-to-Site VPN connection. The company requires a constant throughput of 2 Gbps to replicate database transactions. During testing, they observe that the network throughput does not exceed 1.25 Gbps. What is the primary cause of this throughput limitation?

  1. A
    The Security Groups configured for the target EC2 instances are stateless and are restricting the throughput of the return traffic.
  2. B
    AWS Site-to-Site VPN connections automatically scale up to 10 Gbps, but the throughput is throttled because Equal-Cost Multi-Path (ECMP) routing is disabled on the virtual private gateway.
  3. A single AWS Site-to-Site VPN tunnel has a maximum throughput limit of 1.25 Gbps.Answer
  4. D
    Amazon Route 53 latency routing policy has restricted the VPN connection's bandwidth to prioritize high-availability failover paths.

Answer

A single AWS Site-to-Site VPN tunnel has a maximum throughput limit of 1.25 Gbps.
The correct answer is correct because each AWS Site-to-Site VPN tunnel is subject to a hard throughput limit of 1.25 Gbps. Since a single VPN connection consists of two tunnels (typically configured in an active-passive setup), the maximum throughput of a single active tunnel cannot exceed 1.25 Gbps.

Step-by-Step Solution

1
Identify the network requirements and the current connectivity method.
The workload requires 2 Gbps of throughput, and the current setup uses a single AWS Site-to-Site VPN connection.
This establishes the baseline constraints of the scenario.
2
Evaluate the throughput limitations of a single AWS Site-to-Site VPN tunnel.
Each individual VPN tunnel supports a maximum bandwidth of 1.25 Gbps.
This determines why the throughput is capped at 1.25 Gbps despite needing 2 Gbps.
3
Select the option that matches the physical throughput limits of the service.
The limit is due to the service constraint where a single tunnel is capped at 1.25 Gbps.
This explains the primary bottleneck in the current network architecture.

Key Concept

AWS Site-to-Site VPN Tunnel Throughput Limits
Estimated Time:45s
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Topics

High-Performing and Scalable Network Architectures

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