300-445 Question 190
Single answerA user reports they are unable to access any websites, but they can successfully ping the default gateway. You collect the following data from their device:
- IP Configuration: IP address is 192.168.1.10, subnet mask is 255.255.255.0, default gateway is 192.168.1.1.
- DNS Server: 8.8.8.8
- Ping Test: Successful to 192.168.1.1, unsuccessful to 8.8.8.8.
Based on this information, what is the most likely cause of the issue?
- A
The DNS server (8.8.8.8) is unreachable from the end device.
- B
The default gateway (192.168.1.1) is incorrectly configured.
- C
The subnet mask is misconfigured on the end device.
- D
The wireless connection is unstable, causing packet loss.
Show answer and explanation
Correct answer: A
Explanation
The issue lies in the inability of the end device to reach the DNS server (8.8.8.8). DNS is critical for resolving domain names to IP addresses. Without access to a working DNS server, the user will not be able to access websites despite having a correctly configured local network and default gateway.
- A. Correct.
The device is unable to reach the DNS server (8.8.8.8), which is likely causing the inability to resolve domain names. The successful ping to the default gateway indicates the local network configuration is correct.
- B. Incorrect.
The default gateway is correctly configured, as the user can ping it successfully. This eliminates it as the root cause.
- C. Incorrect.
The subnet mask is correctly configured since the device can communicate with the default gateway, which is on the same subnet.
- D. Incorrect.
There’s no evidence of wireless instability in the data provided. The ping tests to the default gateway are successful, which implies stable connectivity.