A network security engineer has a requirement to allow an external server to access an internal web server. The internal web server must also initiate connections with the external server. What can…

ECMP (Equal-Cost Multi-Path) is a routing technique for load balancing traffic across multiple paths, not a NAT policy simplification method.

Dynamic IP and Port (DIPP) is a common form of Source NAT, but it typically applies to outgoing connections from an internal network to the internet and doesn't inherently simplify the specific bi-directional communication requirement between two specific servers.

When both the external server needs to access the internal server and the internal server needs to initiate connections back to the external server, a bi-directional Source NAT rule can simplify this setup. A bi-directional Source NAT rule handles the source translation for outgoing connections while also implicitly creating the necessary return paths and allowing the internal host to initiate connections to the external server, consolidating related NAT requirements into a single rule.

Destination NAT (DNAT) is for incoming connections from external to internal hosts, and while necessary, enabling 'Bi-directional' on a DNAT rule is not the correct mechanism for handling the internal server initiating *new* connections *outward* to the external server.