The most common VPN protocols are OpenVPN, WireGuard, L2TP/IPsec, IKEv2/IPsec, PPTP and SSTP. These protocols offer different trade-offs between security, speed and compatibility, so the best ...

L2TP, or Layer 2 Tunneling protocol, and IPsec are another common protocol duo. L2TP is one of the oldest protocols — developed in the 1990s. It connects a user to a VPN server, ...

S/MIME. These are end-to-end encryption protocols. S/MIME is designed to encrypt email contents, but leaves the details, such as recipient, sender, open.

Attackers frequently scan for open SSH, FTP, and RDP ports, but companies need to watch out for attacks against less common protocols as well. TechTarget and Informa Tech’s Digital Business Combine.

The protocol has no authentication, meaning that if an attacker can put themselves on the same network, they can act as a man-in-the-middle between the point-of-sale system and the card reader.

These common protocols enable a 10-Mb/s device to communicate transparently with cloud servers running at 800 Gb/s with Ethernet adapters. Ethernet now covers dozens of IEEE 802.3 standards.