220-801 Question #1108: Real Exam Question with Answer & Explanation

The correct answer is C: Port forwarding. A new router uses NAT (Network Address Translation), which by default blocks all unsolicited inbound connections from the internet. Port forwarding creates a rule that maps a specific external port (FTP uses TCP port 21, and passive FTP uses a data port range) to the internal IP

Question

After installing a new wireless router in a home office, a user's remote clients have lost the ability to access the FTP server on the user's home office LAN. Which of the following features in the router MUST be configured before the clients can regain secure access?

Options

AQoS
BPort triggering
CPort forwarding
DMAC filtering

Explanation

A new router uses NAT (Network Address Translation), which by default blocks all unsolicited inbound connections from the internet. Port forwarding creates a rule that maps a specific external port (FTP uses TCP port 21, and passive FTP uses a data port range) to the internal IP address of the FTP server, allowing remote clients to reach it. QoS (Quality of Service) prioritizes traffic bandwidth but does not enable access. Port triggering is a dynamic, outbound-triggered method that is less reliable for servers needing persistent inbound connections. MAC filtering controls which devices can connect to the wireless network but does not affect inbound routing from the internet.

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