10-10# Specify the DNS server 2.1.1.2.[SwitchB] dns server 2.1.1.24) Configuration verification# Execute the ping host.com command on Switch B to verify that the communication between theSwitch and the host is normal and that the corresponding destination IP address is 3.1.1.1.[SwitchB] ping host.comTrying DNS resolve, press CTRL_C to breakTrying DNS server (2.1.1.2)PING host.com (3.1.1.1):56 data bytes, press CTRL_C to breakReply from 3.1.1.1: bytes=56 Sequence=1 ttl=126 time=3 msReply from 3.1.1.1: bytes=56 Sequence=2 ttl=126 time=1 msReply from 3.1.1.1: bytes=56 Sequence=3 ttl=126 time=1 msReply from 3.1.1.1: bytes=56 Sequence=4 ttl=126 time=1 msReply from 3.1.1.1: bytes=56 Sequence=5 ttl=126 time=1 ms--- host.com ping statistics ---5 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 1/1/3 msTroubleshooting DNS ConfigurationSymptomAfter enabling the dynamic domain name resolution, the user cannot get the correct IP address.Solutionz Use the display dns dynamic-host command to verify that the specified domain name is in thecache.z If the specified domain name does not exist, check that dynamic domain name resolution isenabled and the DNS client can communicate with the DNS server.z If the specified domain name is in the cache, but the IP address is incorrect, check that the DNSclient has the correct IP address of the DNS server.z Verify the mapping between the domain name and IP address is correct on the DNS server.
