Troubleshooting Client DNS Issues | Cisco 200-125 Exam

Two Tasks to Perform when Troubleshooting Client DNS Issues

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When troubleshooting client DNS issues, which two tasks must you perform? (Choose two.)

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A. B. C. D. E.

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When troubleshooting client DNS issues, you need to perform the following two tasks:

  1. Determine whether the name servers have been configured: The name servers contain the information about the mapping between domain names and IP addresses. If the name servers are not configured correctly, the client will not be able to resolve domain names to IP addresses. To check if the name servers are configured correctly, you can perform the following steps:

    • Check the DNS server configuration on the client system: Make sure that the DNS server address is configured correctly in the client's network settings. You can check this by going to the network settings of the client system and checking the DNS server settings.

    • Check the DNS server configuration on the DHCP server: If the client is configured to obtain the IP address automatically from a DHCP server, you need to check the DNS server configuration on the DHCP server. Make sure that the correct DNS server address is assigned to the client.

    • Use nslookup command: You can use the nslookup command to check whether the name servers are configured correctly. The nslookup command is a tool used to query DNS servers for domain name resolution. By using the nslookup command, you can query the configured name servers for a domain name and check whether they are able to resolve it to an IP address.

  2. Ping a public website IP address: If the name servers are configured correctly, but the client is still unable to access the internet, you need to check whether the client is able to reach the internet. To check this, you can ping a public website IP address. Pinging a public website IP address will help you to determine whether the issue is with the client's connectivity to the internet or with the DNS resolution. If the client is able to ping the public website IP address, the issue is with the DNS resolution. If the client is unable to ping the public website IP address, the issue is with the client's connectivity to the internet.

In summary, when troubleshooting client DNS issues, you must perform the following two tasks: check whether the name servers are configured correctly and ping a public website IP address.

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