Drew should use IPsec VPNs mode.
In the term, IPsec IP stands for Internet Protocol and sec stands for secure. IPsec refers to a group of protocols used together to set up encrypted connections between connected devices, with an aim to keep the data sent over the Internet secure. IPsec is usually used to set up virtual private networks (VPNs). IPsec VPNs encrypt IP packets, along with authenticating the source from where the packets come.
According to the given situation where Drew wants to use an IPsec mode through which he is able to determine the IPsec policy for network traffic based on the port it is being transferred to on the remote system, the appropriate mode to be used is IPsec VPNs.
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