SK0-003 · Question #171
An administrator has just installed a web server for the companys Internet site. After bringing the system online, customers notify the administrator that they cannot connect to the server. The admini
The correct answer is D. The company firewall is misconfigured.. If internal users can access a web server but external customers cannot, the most likely cause is a misconfigured company firewall blocking inbound public internet traffic to the server.
Question
An administrator has just installed a web server for the companys Internet site. After bringing the system online, customers notify the administrator that they cannot connect to the server. The administrator tests the web server from a workstation and can access the website. The customers continue to report issues. Which of the following is the MOST likely reason for this?
Options
- AThe servers firewall is misconfigured.
- BThe server's timeout feature is set incorrectly.
- CThe web server was not installed properly.
- DThe company firewall is misconfigured.
How the community answered
(21 responses)- A24% (5)
- B5% (1)
- C14% (3)
- D57% (12)
Why each option
If internal users can access a web server but external customers cannot, the most likely cause is a misconfigured company firewall blocking inbound public internet traffic to the server.
If the server's local firewall was misconfigured, the administrator would likely be unable to access the web server even from a local workstation, contradicting the problem statement.
An incorrectly set server timeout feature would typically manifest as slow connections or dropped sessions, not a complete inability for external users to connect while internal users can.
If the web server was not installed properly, it's unlikely the administrator would be able to access it successfully from a workstation, indicating the web server software itself is functional.
Since the administrator can access the web server from a workstation (presumably internal to the network), but external customers cannot, it strongly suggests that a network device between the internet and the web server is blocking traffic. The company firewall, positioned at the network perimeter, is the most common point of failure for external access to internal services.
Concept tested: Network perimeter security and firewall configuration
Source: https://www.cisco.com/c/en/us/products/security/firewalls/what-is-a-firewall.html
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