Netcat can grab multiple service strings from a series of ports on a target by connecting to ports in a specific sequence. This sequence starts at port Y and decrements by 1 until reaching port X. Which description best matches this port sequence?

• A. A Decreasing Sequence From Y Down To X
• B. An Increasing Sequence From X Up To Y
• C. A Random Selection Of Ports
• D. Only A Single Port X

Answer: (A)

Port scanning often involves stepping through a contiguous set of ports to elicit responses. If you start at Y and subtract 1 each time until you reach X, you’re moving to smaller port numbers with every step. That describes a decreasing (descending) sequence from Y down to X. It captures both the continuous range and the directional order the sequence follows. An increasing sequence would go from X up to Y, which isn’t the described order. A random selection wouldn’t be a continuous decrement, and checking only a single port would not gather multiple service strings across ports.