Question

Why it is important to know which service is using which port number?

(a) For database security

(b) For reporting data security to the auditor

(c) For understanding which data is going through secured traffic and which is not

(d) For checking unused data traffic

This question was posed to me in exam.

This intriguing question comes from Ports and Its Types in division Cyber Security of Cyber Security

Answer 1

Correct choice is (c) For understanding which data is going through secured traffic and which is not

Easy explanation: If a security analyst or ethical hacker knows which port is open and through which port data is going, he/she will be able to know which data is going in encrypted form and which one is not. Also, it helps in securing a system by closing the logical ports so that hackers cannot gain access through them.