CompTIA
220-802 · Question #963
220-802 Question #963: Real Exam Question with Answer & Explanation
The correct answer is C: The router firewall is enabled.. Ping uses ICMP while RDP uses TCP port 3389; a firewall can block one protocol while allowing the other, explaining why ping succeeds but RDP fails.
Question
A technician recently installed Windows 7 on a PC. The technician is unable to connect to the PC remotely using RDP, but is able to ping the PC. Which of the following is the MOST likely cause?
Options
- AThe PC is infected with a virus.
- BThe network card is defective.
- CThe router firewall is enabled.
- DThe Remote Assistance is disabled.
Explanation
Ping uses ICMP while RDP uses TCP port 3389; a firewall can block one protocol while allowing the other, explaining why ping succeeds but RDP fails.
Common mistakes.
- A. A virus infection would not typically allow ping to succeed while selectively blocking only RDP without producing other observable symptoms.
- B. If the network card were defective, ICMP ping traffic would also fail since both protocols share the same physical NIC.
- D. Remote Assistance is a separate Windows feature from Remote Desktop Protocol and its enabled or disabled state has no effect on RDP connectivity.
Concept tested. Firewall port blocking affecting RDP vs ICMP
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