ICS/SCADA Cybersecurity — Question 1

What type of protocol is represented by the number 6?

Answer options

• A. UDP
• B. IGRP
• C. ICMP
• D. TCP

Correct answer: D

Explanation

The correct answer is D, TCP, as it is assigned the protocol number 6 in the IP protocol suite. UDP (A) is number 17, IGRP (B) is a routing protocol and does not have a direct protocol number, and ICMP (C) is assigned number 1, making them incorrect options.