Systems Security Certified Practitioner – SSCP – Question0821

The IP header contains a protocol field. If this field contains the value of 6, what type of data is contained within the ip datagram?

A. TCP.
B. ICMP.
C. UDP.
D. IGMP.

Correct Answer: A

Explanation:

If the protocol field has a value of 6 then it would indicate it was TCP. The protocol field of the IP packet dictates what protocol the IP packet is using.
TCP=6, ICMP=1, UDP=17, IGMP=2
The following answers are incorrect:
ICMP. Is incorrect because the value for an ICMP protocol would be 1. UDP. Is incorrect because the value for an UDP protocol would be 17. IGMP. Is incorrect because the value for an IGMP protocol would be 2.
References: SANS http://www.sans.org/resources/tcpip.pdf?ref=3871