220-1102 Question 92
Single answerAdditional toolsA technician is troubleshooting a Windows 11 workstation that intermittently loses access to internal file shares after connecting through a VPN. The user reports that websites still load, but \fileserver\department becomes unavailable until the PC is restarted. The technician wants to verify whether the problem is name resolution rather than general network connectivity and wants a tool that can query DNS records directly from the command line. Which tool should the technician use?
- A
nslookup
- B
netstat
- C
tasklist
- D
gpupdate
- E
sfc
Show answer and explanation
Correct answer: A
Explanation
The best answer is nslookup because the scenario specifically points to a possible DNS name resolution problem rather than a total loss of connectivity. The user can still access websites, which suggests the network stack is functioning, but the internal resource name may not be resolving correctly after the VPN connection changes DNS settings or search suffixes. In real-world troubleshooting, a technician would use nslookup to query the hostname and compare the result with expected internal DNS records. This aligns with standard Windows command-line troubleshooting practices documented by Microsoft for DNS diagnostics. By contrast, netstat is for connection and port information, tasklist is for process enumeration, gpupdate refreshes Group Policy, and sfc checks system file integrity. For A+ Core 2, knowing when to use built-in support tools such as nslookup is part of practical operating system and troubleshooting competency.
- A. Correct.
Correct. nslookup is a command-line tool used to query DNS servers and verify name resolution. In this scenario, the technician suspects the workstation may not be resolving the internal file server name correctly after the VPN connection changes DNS behavior. Using nslookup to test the hostname directly is an appropriate way to confirm whether DNS is the issue.
- B. Incorrect.
Incorrect. netstat displays active network connections, listening ports, and protocol statistics. It is useful for checking whether a connection exists or whether a service is listening, but it does not directly query DNS records to verify name resolution for a host such as fileserver.
- C. Incorrect.
Incorrect. tasklist shows currently running processes on a Windows system. A technician might use it to confirm whether a VPN client process is running, but it does not test DNS resolution or help determine whether the file server name is resolving correctly.
- D. Incorrect.
Incorrect. gpupdate refreshes Group Policy settings on a Windows computer. Someone might choose it if they suspect a policy-related network drive issue, but it is not the correct tool for directly testing DNS name resolution after a VPN connection change.
- E. Incorrect.
Incorrect. sfc scans and repairs protected Windows system files. It is useful when the operating system may have corrupted files, but it is unrelated to DNS troubleshooting or verifying whether a server hostname resolves to an IP address.