Which two (2) protocols are defined in the IPSEC standard?

A.
AH

B.
ESP

C.
GRE

D.
L2TP

Explanation:
IP Security (IPSec) is a suite of related protocols for cryptographically securing communications at the IP packet layer. IPSec consists of two modes and two main protocols:
Transport and tunnel modes
The Authentication Header (AH) protocol for authentication and the Encapsulating Security Payload (ESP)
protocol for encryption (and authentication)