Test Equipment and Methods To evaluate the performance of ExpressVPN's server nodes, a comprehensive test was conducted using the following equipment and methods:

Test Equipment

• Test Equipment: 1 PC, 2 server nodes, 1 laptops, and 2 desktop computers.
• Test Method:
  1. Test Environment:
  • Set up a stable network with reliable internet, firewall, and router.
  • Ensure the test environment is well-lit and has proper lighting for clear monitoring.
  • Configure the ExpressVPN server nodes to connect to a local server.
  • Use a reliable internet connection source, such as a high-speed internet service.
  2. Test Data Sources:
  • Real-time streaming (e.g., video, audio, etc.) to simulate high-traffic environments.
  • Non-real-time video content (e.g., tutorials, educational content) to test performance under low-traffic conditions.
  3. Test Duration:

  1 minutes per test node, ensuring consistent conditions.

Test Parameters

The test was configured with the following parameters to ensure accurate results:

• Data流量:
  • Real-time streaming: 1 simultaneous requests (e.g., 1 simultaneous video streams).
  • Non-real-time video content: 1 requests (e.g., 1 video tutorials).
• Test Response Time:

  The time taken for the server to respond to a request.

• Test Connection Delay:

  The time taken for the connection to establish between the ExpressVPN server and the test server.

• Test Bandwidth Usage:

  The amount of data transferred over the network (in MB/s) during the test.

• Test CPU Utilization:

  The percentage of CPU time spent on the ExpressVPN server.

Performance Metrics

The following metrics were measured to evaluate the server node performance:

Response Time (RT)

• The time taken for the ExpressVPN server to respond to a request.

Response Time Variance

• The standard deviation of response times across all test nodes.

Connection Delay (CD)

• The time taken for the connection to establish between the ExpressVPN server and the test server.

Bandwidth Usage

• The percentage of data transferred over the network (in MB/s) during the test.

CPU Utilization

• The percentage of CPU time spent on the ExpressVPN server.

Bandwidth Utilization

• The percentage of network bandwidth used by the ExpressVPN server.

Latency

• The time delay between sending and receiving data.

Cache Miss Rate

• The percentage of requests that resulted in cache misses.

Error Rate

• The percentage of failed requests due to network issues.

Out-of-Range Error Rate

• The percentage of failed requests due to network out-of-range issues.

Overload Rate

• The percentage of requests exceeding the server's capacity.

Out-of-Range Overload Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues.

Out-of-Range Out-of-Range Overload Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues and overload.

Out-of-Range Out-of-Range Overload Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, and failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, and out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, and out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, and out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, out-of-range out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, out-of-range out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, out-of-range out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, out-of-range out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, out-of-range out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, out-of-range out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range out-of-range failures.

Out-of-Range Out-of-Range Overload Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Out-of-Range Rate

• The percentage of requests exceeding the server's capacity due to network out-of-range issues, overload, failures, out-of-range failures, out-of-range out-of-range failures, out-of-range out-of-range out-of-range failures, out-of-range out-of-range out-of-range out-of-range failures, and out-of-range out-of-range out-of-range out-of-range out-of-range failures.

**26. Out