220-1101 Question 88
Single answer2.3 Summarize services provided by networked hosts.A small office has a file server that users can reach by typing \fileshare into File Explorer, but a new workstation cannot connect by hostname. The technician verifies that the workstation has the correct IP configuration and can access the server by typing \192.168.10.15. Other PCs on the network can still reach the server by hostname. Which network host service is most likely unavailable to the new workstation?
- A
DNS service
- B
DHCP service
- C
File sharing service
- D
NTP service
Show answer and explanation
Correct answer: A
Explanation
This question tests understanding of services provided by networked hosts, specifically DNS. In Windows networking, accessing a shared resource by hostname requires successful name resolution. If access by IP address works but access by hostname fails, technicians should first suspect DNS resolution problems on the client. This aligns with standard troubleshooting practice: verify connectivity by IP, then verify name resolution. CompTIA A+ Core 1 objective 2.3 includes recognizing common network host services such as DNS, DHCP, file sharing, and NTP, along with their practical roles. Microsoft and general TCP/IP documentation consistently identify DNS as the service used to map hostnames to IP addresses.
- A. Correct.
Correct. DNS service resolves hostnames such as "fileshare" to IP addresses. Because the workstation can connect by IP address but not by hostname, name resolution is the most likely issue. In a real environment, a missing or incorrect DNS server setting on the client commonly causes this symptom.
- B. Incorrect.
Incorrect. DHCP provides IP configuration such as an IP address, subnet mask, default gateway, and often DNS servers. However, the scenario states that the workstation already has the correct IP configuration. While DHCP can deliver DNS settings, the unavailable service being tested here is name resolution, which is provided by DNS.
- C. Incorrect.
Incorrect. The file sharing service on the server is clearly working because the workstation can access the resource by IP address and other PCs can access it by hostname. If file sharing were down, neither hostname nor IP-based access would work properly.
- D. Incorrect.
Incorrect. NTP synchronizes time between systems. Time issues can affect some authentication scenarios, but they do not directly explain why a workstation can access a server by IP address but not by hostname. This option is a plausible distractor because it is a network host service, but it is not the service responsible for name resolution.