The Internet Protocol Security (IPSec) protocol suite is specifically designed to provide a robust suite of protocols that operate at the Internet Layer of the Internet Protocol Suite, allowing it to secure IP communications by authenticating and encrypting each IP packet in a communication session. It includes functionalities for automated key management, which makes it suitable for scenarios that require secure key exchange mechanisms. It is also capable of Network Address Translator (NAT) traversal, allowing devices behind NATs to use IPSec securely. Secure Sockets Layer/Transport Layer Security (SSL/TLS) usually secures transmissions at a higher layer than the Internet Layer and is commonly implemented for secure web browsing, not for securing all IP traffic. Layer Two Tunneling Protocol (L2TP) is a tunneling protocol that does not provide encryption or confidentiality by itself, which is why it is often combined with IPSec. Point-to-Point Tunneling Protocol (PPTP) has known vulnerabilities and does not offer the same level of security as IPSec.