The IP header contains a protocol field. If this field contains the value of 51, what type of data is contained within the ip datagram? 

Answer options:

A. Transmission Control Protocol (TCP)
B. Authentication Header (AH)
C. User datagram protocol (UDP)
D. Internet Control Message Protocol (ICMP)

B

TCP has the value of 6 - UDP has the value of 17 - ICMP has the value of 1 - Reference: SANS http://www.sans.org/resources/tcpip.pdf?ref=3871