Know the various metrics used for network performance. Metrics are quantitative measurements from the operating system or network device. The error rate is often captured at layer 2 (data link layer) to identify problems with erroneous frames received by the network device or operating system. Utilization is a percentage of the connection used by network traffic. Packet drops is a measurement at layer 4 (transport layer) as an incremental counter. Packet drops can also be measured at layer 3 (network layer), using ICMP round-trip calculations; this metric is presented as a percentage of loss. Bandwidth/throughput is an exact measurement in bits per second of the bandwidth used for a connection.
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