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S12700 V200R011C10 Configuration Guide - Network Management and Monitoring

This document provides the configurations of network management and monitoring features supported by the product, including SNMP, RMON and RMON2, LLDP, Performance Management, iPCA, NQA, Service Diagnosis, Mirroring, Packet Capture, Traffic Distribution, NetStream, sFlow, and TWAMP Light.
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DNS Test

DNS Test

The NQA DNS test is performed using the User Datagram Protocol (UDP) packets. The NQA client simulates a DNS client and sends a DNS request to a specified Dynamic Host Configuration Protocol (DHCP) server. This test helps you determine DNS server availability and measure DNS resolution speed.

Figure 6-1 shows the process of a DNS test:

  1. The DNS client (SwitchA) sends a DNS query packet to the DNS server, requesting the server to resolve a specified DNS name.

  2. The DNS server receives the query packet, constructs a response packet, and sends it to the client.

  3. SwitchA receives the response packet and calculates the time between when it sent the query packet and when it received the response packet.

Figure 6-1  Network for DNS test

A DNS test only simulates the DNS resolution process. It does not save the mapping between domain names and IP addresses.

However, DNS test results and historical records are collected in test instances. You can run commands to view the test results and historical records.

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Updated: 2019-10-21

Document ID: EDOC1000178113

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