When sending encrypted traffic from firewall to firewall, why does there need to be an extra IP header? Why cannot the firewall simply encrypt the packet, leaving the source and destination as the original source and destination?

Jane’s team is using the v-shaped model for their project. during the high-level design phase of the project, testers perform integration testing. what is the purpose of an integration test plan in the v-model of development? a. checks if the team has gathered all the requirements b. checks how the product interacts with external systems c. checks the flow of data in internal modules d. checks how the product works from the client side