Which component is commonly referred to as the Southbridge in traditional PC architectures?

• A. Northbridge
• B. Southbridge
• C. Chipset bridge
• D. Memory Controller

Answer: (B)

In traditional PC chipsets, the chipset is split into two main bridges: Northbridge and Southbridge. The Southbridge is the part that handles the slower input/output tasks and peripheral interfaces, such as USB, storage controllers (IDE/SATA), audio, network, and other I/O buses, acting as the hub for external devices. That’s why this component is commonly referred to as the Southbridge. The Northbridge, in contrast, connects to the CPU and memory controller and handles high-speed paths like the memory and graphics bus. The other options don’t fit because they refer to parts that handle different roles (high-speed CPU/memory paths or generic chipset terminology) or aren’t the historical label for the I/O-focused bridge.