The following ip protocols and ports are commonly used in IPSec protocols.
A.
IP protocol 50 and 51, UDP port 500 and 4500
B.
IP protocols 50, 51, 500, and 4500
C.
IP protocols 50 and 51, UDP port 500, and TCP port 4500
D.
TCP ports 50, 51, 500, and 4500
E.
UDP ports 50, 51, 500, and 4500
Explanation:
TCP and UDP exist on Layer 4 of the OSI model. At this layer of the OSI model ports are used but not on Layer 3 which is were IP is used and data is identified with IP Addresses. In addition no protocols are listed only port numbers. Because of this A, D, & E are wrong.An ISAKMP message is the payload of a (User Datagram Protocol) UDP message with the source and destination UDP ports set to 500 (or 4500). An ISAKMP message has an ISAKMP header and one or more ISAKMP payloads as defined in RFC 2408.