A technician attempts to join a Windows client to a domain but receives the following error: An attempt to resolve the hostname has failed. The technician generates the display shown below utilizing ipconfig /all. https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/CompTIA_220-1101/page_300_img_1.jpg Which of the following is the most likely reason for the error?

Option A so tired of these DNS hostname errors popping up in the exam banks.

My pick: A, hostname resolution always screams DNS problem not IP or mask.

A , not D. The hostname error is almost always DNS, subnet/gateway would hit connectivity issues before this point.

Question 10 - CompTIA A+ 220-1101 Real Exam Questions [Jan 2026 Update]

Q: 10

A technician attempts to join a Windows client to a domain but receives the following error: An attempt to resolve the hostname has failed. The technician generates the display shown below utilizing ipconfig /all.

Which of the following is the most likely reason for the error?

Options

Correct Answer:

Explanation

The error message, "An attempt to resolve the hostname has failed," is a direct indication of a Domain Name System (DNS) issue. For a client to join a Windows domain, it must be able to locate a domain controller by resolving its name. The ipconfig /all output shows the client is using 192.168.1.1 (the default gateway) as its DNS server. In a typical domain environment, clients must be configured to use the domain controller's IP address for DNS, as the domain controller hosts the specific DNS records (like SRV records) required to locate domain services. The current configuration prevents the client from finding the domain controller, thus causing the join to fail.

Why Incorrect

B. Physical address: The physical (MAC) address operates at Layer 2 for local network communication and is not used for resolving domain names.

C. Subnet mask: The subnet mask is correctly configured for the network. An incorrect mask would cause general connectivity problems, not a specific name resolution failure.

D. IPv4 address: The client's IPv4 address is valid for the configured subnet and is not the cause of a hostname resolution error.

E. Default gateway: The default gateway is used for routing traffic to other networks. While essential for overall connectivity, its misconfiguration would not produce this specific DNS error.

References

1. Microsoft Corporation. (2023). Troubleshooting domain join error messages. Microsoft Learn. Retrieved from https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/troubleshooting-domain-join-error-messages.

Reference Specifics: In the table of error messages

the cause for "An attempt to resolve the DNS name of a domain controller in the domain being joined has failed" is listed as: "Verify that this client is configured to reach a DNS server that can resolve DNS names in the target domain." This directly confirms the issue is DNS configuration.

2. Microsoft Corporation. (2009). How DNS Support for Active Directory Works. Microsoft TechNet. Retrieved from https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2003/cc781627(v=ws.10).

Reference Specifics: The section "Locating a Domain Controller" explains that a client computer locates a domain controller by querying DNS for a service (SRV) resource record. This process fails if the client's configured DNS server does not host or cannot resolve records for the target domain.

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