A technician wants to configure the inbound port of a router to prevent FTP traffic from leaving the LAN. Which of the following should be placed on the router interface to accomplish this goal?
A. Static routes for all port 80 traffic
B. DHCP reservations for all /24 subnets
C. ACL for ports 20 and 21
D. MAC filtering using wildcards

The technician will want to add ACL for ports 20 and 21

Explanation:

The FTP protocol by default will attempt to use 21 for TCP access and 20 for data access.  By enabling an Access Control List (ACL) on ports 20 and 21, the technician can prevent FTP traffic from leaving the network on the default ports.

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