Home » CompTIA » JK0-019 » Which of the following protocols works at the LOWEST layer of the OSI model?
Which of the following protocols works at the LOWEST layer of the OSI model?
A. L2TP
B. PPTP
C. ISAKMP
D. IPSec
Correct Answer: A
Explanation/Reference:
Explanation: Layer Two Tunneling Protocol (L2TP) is an extension of the Point-to-Point Tunneling Protocol (PPTP) used by an Internet service provider (ISP) to enable the operation of a virtual private network (VPN) over the Internet.