COMPUTER NETWORKING

Detailed explanation-1: -L2TP does not encrypt the tunnel itself but often uses IPsec for encryption (as L2TP/ IPsec). L2TP uses UDP port 1701. encrypts VPN traffic using SSL over port 443. Using port 443 provides a lot of flexibility for many administrators and rarely requires opening additional firewall ports.

Detailed explanation-2: -Due to its lack of encryption and authentication, Layer 2 Protocol is usually paired with IPsec (Internet Protocol Security) protocol, which provides the encryption and controls packets within the tunnel. IPsec encrypts L2TP packets between the endpoints.

Detailed explanation-3: -IPsec is often used to secure L2TP packets by providing confidentiality, authentication and integrity. The combination of these two protocols is generally known as L2TP/IPsec (discussed below). The two endpoints of an L2TP tunnel are called the L2TP access concentrator (LAC) and the L2TP network server (LNS).

Detailed explanation-4: -L2TP is a VPN protocol that doesn’t offer any encryption or protection from the traffic that passes through the connection. For this reason, it’s usually paired with IPSec, which is an encryption protocol.

Detailed explanation-5: -VPN protocols that use IPSec encryption include L2TP, IKEv2, and SSTP. OpenVPN is the most popular protocol that uses SSL encryption, specifically the OpenSSL library. SSL is used in some browser-based VPNs as well.