Answer: Well Known Ports
Step-by-step explanation:Dynamic Host Configuration Protocol(DHCP) and File transfer protocol(FTP) are the protocols that have ports for their working , so if there is the request of the traffic over the network then there are well known ports which can receive it.
DHCP has the port 67 as the default port which is well known for receiving of the any default data and FTP has the port 21 as well defined port for receiving the default values.