300-445 Question 189
Select 2A user reports that they are unable to access the internet from their laptop. Upon investigation, you collect the following data:
- The laptop is connected to the wireless network and has an IP address in the correct subnet.
- Pinging the local default gateway is successful.
- Pinging external IP addresses, such as 8.8.8.8, is unsuccessful.
- Attempting to resolve domain names, such as www.example.com, fails with a DNS error.
What could be the most likely causes of the issue? (Select two)
- A
The DNS server configuration on the laptop is incorrect.
- B
The wireless access point has a misconfiguration.
- C
The default gateway is down.
- D
There is an issue with the VPN gateway configuration.
- E
The internet connection from the ISP is disrupted.
Show answer and explanation
Correct answers: A, E
Explanation
The issue involves both DNS resolution and the inability to reach external IP addresses. These symptoms point to problems with the DNS server configuration on the laptop and/or a disruption in the ISP's internet connection. The successful ping to the default gateway eliminates issues with the local network or the gateway itself, while the lack of a VPN in the scenario rules out VPN-related problems.
- A. Correct.
The DNS server configuration on the laptop being incorrect would explain why domain name resolution is failing. Since the user cannot resolve domain names, this is a likely cause.
- B. Incorrect.
A misconfiguration on the wireless access point is unlikely because the laptop is successfully connected to the wireless network and has a proper IP address.
- C. Incorrect.
The default gateway is functioning correctly, as the user is able to ping it successfully.
- D. Incorrect.
There is no mention of a VPN being used in this scenario, so an issue with the VPN gateway configuration is not relevant.
- E. Correct.
If the internet connection from the ISP is disrupted, it could explain why external IP addresses, such as 8.8.8.8, are not reachable.