Practice Quiz

CompTIA A+ 220-901

Category - Networking

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You are having problems connecting to a client’s computer using a Remote Desktop connection. All other network services are working fine. Which of the following could be a possible reason for this?
  1. The DHCP server is down.
  2. The NIC is faulty.
  3. The firewall has blocked port 3389.
  4. The DNS server is down.
Explanation
Answer: C- Remote desktop uses port 3389 by default, so you should determine whether the firewall has blocked port 443.

Key Takeaway: When a number of protocols are used on a network and a firewall is used, make sure that the necessary ports are left open on the firewall. You can do this using the firewall’s control panel. You can refer to the RFC documentation for the default ports used by the network protocols.
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