A penetration tester ran a ping -A command during an unknown environment test, and it returned a 128 TTL packet. Which of the following OSs would MOST likely return a packet of this type?

Different operating systems commonly use distinct initial TTL values for IP packets. A TTL of 128 is a widely recognized default for Windows operating systems (e.g., Windows 10, Windows Server). When a packet is sent from a Windows host, it starts with a TTL of 128, and this value decrements by one for each hop it traverses, meaning a directly connected Windows host or one a few hops away will often show a TTL close to 128.

Apple (macOS) systems typically use an initial TTL of 64.

Linux systems commonly use an initial TTL of 64.

Android systems, being Linux-based, also typically use an initial TTL of 64.