What are the technical skills that penetration testers need?

When running anti-virus software , what could be a reason where recipitent is not guaranteed that data being streamed will not get interrupted?

If the polar bear were taken out of the food chain what would happen to the seal population the seal population would diminish the seal population would grow dramatically the seal population would stay the same the seal population would decrease slightly

The keyboard usually has six rows of keys. which of the following is not one of the key group categories? letter keys number keys control keys graphic keys