Network Layers

Understanding network layers in multi-trader exchange connectivity

This foundational networking question tests whether a candidate understands how packets are routed and segregated when multiple traders connect to the same exchange endpoint. It touches on the practical infrastructure behind electronic trading systems, where hundreds of firms may submit orders to identical IP addresses and ports yet receive isolated, secure connectivity.

The question requires you to identify which layer of the network stack handles packet differentiation and logical separation between clients sharing physical infrastructure. This is particularly relevant in quantitative finance, where understanding the network boundary between your order flow and that of competitors—and between your firm and the exchange—is operationally important.

• OSI model layers and their responsibilities
• Packet headers and metadata at different layers
• Logical vs. physical connectivity in trading networks