Systems Security Certified Practitioner – SSCP – Question0816

The IP header contains a protocol field. If this field contains the value of 17, what type of data is contained within the ip datagram?

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

Correct Answer: C

Explanation:

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