Explanatiion : Beginning of the the Archean Eon, was a major time of ocean formation and availability of water molecules which were bonded to hydrogen atoms.
There was a lack of oxygen in the atmosphere eventhough it existed in water molecules. The available organisms were cyanobacteria which were blue- green algae. Eventhough oxygen wasn't there cyanobacteria were able convert sunlight to energy. This is when the photosynthesis took place , when they made their own food in the ocean and they secreted oxygen .
The penetration tester would most likely use a port scanner. A port scanner can be explained to be an application that is made to check a server or host for ports that are open. This application can also be used by administrators to check their security networks so as to know those network services that are running on a host and also to know existing vulnerabilities. Attackers also use this to exploit victims.
