The IBM 3700, known as the Lenovo Flex System EN4091, is a 10Gb Ethernet Pass-thru module designed to offer high-speed networking capabilities to servers within the Lenovo Flex System environment. This module provides an efficient and cost-effective way to connect Flex System compute nodes to external networks, bypassing the need for individual external switches and reducing overall network complexity and costs. With 10 Gigabit Ethernet connectivity, it supports high data transfer rates, making it suitable for applications requiring fast network access such as virtualization, cloud computing, and high-performance computing. The pass-thru nature of this module means that external switch policy settings apply directly to server ports, allowing for easier management and configuration. The Lenovo Flex System EN4091 emphasizes scalability and flexibility, allowing for seamless integration into existing network infrastructures, thereby enhancing the performance and efficiency of data center operations.