A network administrator runs the following command on a host experiencing name resolution failures:
C:\> nslookup app.corp.local 192.168.1.10
Server: dns01.corp.local
Address: 192.168.1.10
*** dns01.corp.local can't find app.corp.local: Non-existent domain
Based on the output, which TWO of the following represent plausible root causes for this error? (Select TWO.)
- An A record for the hostname app.corp.local is missing from the forward lookup zone on the DNS server.Answer
- The queried hostname app.corp.local contains a typographical error or does not match the configured domain name record.Answer
- CThe DNS server IP address is configured as the local host's default gateway address on TCP port 53.
- DThe client network router failed to convert UDP port 53 DNS queries into TCP port 80 HTTP packets.
Answer
The correct root causes are that an A record for app.corp.local is missing from the DNS server's forward lookup zone, and that the queried hostname contains a typographical error or does not match the record.
The nslookup utility successfully established contact with DNS server 192.168.1.10, but received an NXDOMAIN response. This demonstrates that network layer connectivity is operational, but the DNS zone database lacks an A/AAAA record for the queried name, or the user queried a misspelled domain name.
Step-by-Step Solution
Key Concept
Troubleshooting DNS NXDOMAIN Errors and Host Record Misconfigurations