8Configuring NQAOverviewNetwork quality analyzer (NQA) allows you to measure network performance, verify the service levelsfor IP services and applications, and troubleshoot network problems. It provides the following types ofoperations:• ICMP echo.• DHCP.• DNS.• FTP.• HTTP.• UDP jitter.• SNMP.• TCP.• UDP echo.• UDP tracert.• Voice.• Path jitter.• DLSw.As shown in Figure 5, the NQA source device (NQA client) sends data to the NQA destination deviceby simulating IP services and applications to measure network performance. The obtained performancemetrics include the one-way latency, jitter, packet loss, voice quality, application performance, andserver response time.All types of NQA operations require the NQA client, but only the TCP, UDP echo, UDP jitter, and voiceoperations require the NQA server. The NQA operations for services that are already provided by thedestination device such as FTP do not need the NQA server.You can configure the NQA server to listen and respond to specific IP addresses and ports to meetvarious test needs.Figure 5 Network diagramNQA operationThe following describes how NQA performs different types of operations:• A TCP or DLSw operation sets up a connection.
