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external Penetration Testers for a large enterprise network

You are hired as part of a team of external Penetration Testers for a large enterprise network. The organization that hired your team is in the retail industry and processes over 100,000 credit card transactions everyday across 100 store locations. This organization has a very large network infrastructure that connects their retail stores, business offices, and company headquarters. The Chief Information Security Officer (CISO) would like your team to focus on their most critical systems and devices.
Prior to executing the penetration test, the CISO would like to meet with the team as they are nervous about the test potentially bringing their network down. They would like to minimize impacts to their production environment and ensure that their backup systems and devices are not targeted at the same time. They want you to focus on the following: DNS servers, mail servers, web servers, database servers, firewalls, and routers.
Your Team Lead would like you to develop a Test Plan for the penetration test.