100-140 Question 221
Select 2You are troubleshooting a network issue where a user cannot access a specific website. To test the connectivity between the user's computer and the website's server, you decide to use the ping command. After running the command, you see the following output:
Request timed out. Request timed out. Request timed out. Request timed out.
What are the most likely causes of this issue?
- A
The web server is down or unreachable.
- B
The user's computer does not have internet access.
- C
A firewall is blocking ICMP requests.
- D
The DNS server on the user's computer is misconfigured.
- E
The user's computer is using an incorrect IP address for the website.
Show answer and explanation
Correct answers: A, C
Explanation
The ping command sends ICMP Echo Requests to test connectivity. In this scenario, timeouts indicate that the packets are not reaching the destination or the responses are being blocked. A likely cause is that the web server is down or unreachable, or a firewall is blocking ICMP traffic. Other options like DNS misconfiguration or incorrect IP address would produce different error messages (e.g., 'Ping request could not find host' or 'Destination Host Unreachable').
- A. Correct.
This is a valid cause. If the web server is down or unreachable, it cannot respond to the ping requests, resulting in timeouts.
- B. Incorrect.
This is not necessarily correct because lack of internet access would prevent all network activity, and the question specifically mentions only one website is inaccessible.
- C. Correct.
This is a valid cause. Firewalls often block ICMP (ping) requests to protect systems, which would result in timeouts.
- D. Incorrect.
This is not a likely cause because if the DNS server were misconfigured, the ping command would fail to resolve the domain name rather than showing timeouts.
- E. Incorrect.
This is not a likely cause because an incorrect IP address would prevent the website from being reached at all, and the ping command would not send packets to the correct destination.