Quiz Entry - updated: 2026.07.14
What four switch features help alleviate network congestion?
Fast port speeds, fast internal switching, large frame buffers, and high port density.
| Feature | How It Reduces Congestion |
|---|---|
| Fast Port Speeds | Ports up to 100 Gbps mean frames spend less time on the wire, reducing queuing delays |
| Fast Internal Switching | Uses a high-speed internal bus or shared memory (backplane) so the switch can process frames faster than they arrive |
| Large Frame Buffers | Temporary storage for bursts of traffic — prevents frame drops during congestion spikes (e.g., many ports sending to one port simultaneously) |
| High Port Density | More ports per switch = more devices on the LAN (Local Area Network) with fewer interconnected switches, keeping traffic local and reducing inter-switch bottlenecks |
These features work together with full-duplex and MAC (Media Access Control) address tables to make modern switched networks far more efficient than the old shared-media hub-based networks.
Real-world context: A modern enterprise switch like a Cisco Catalyst 9300 has a switching capacity of 480 Gbps+ with 48 ports — it can handle all ports sending at full speed simultaneously without dropping frames (called non-blocking or wire-speed switching).
Go deeper:
Network congestion (Wikipedia) — queueing delay and buffer-overflow drops that large buffers and fast switching counter.- Network switch (Wikipedia) — overview of switch types and form factors, including the high-port-density designs that keep traffic local.