Bandwidth vs speed
Bandwidth is the width of the pipe — how much data can pass through per unit time; speed / latency is how long data takes to traverse it. A Gigabit Ethernet link provides 1 Gbps of bandwidth, but real throughput is still affected by CPU, storage I/O, and network latency.
Bandwidth management in the data center
Inside the data center, bandwidth management covers port-utilization monitoring, traffic shaping, QoS policy configuration, and more. Key advantages: identify saturated links, plan capacity, prioritize business traffic, prevent congestion.