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MCITP MCSE : Security Specialist Identify the following security protocols and describe their purpose and function: IPsec IP Security, is a set of protocols used to support secure exchange of packets at the IP layer. IPsec supports two encryption modes: Transport and Tunnel. Transport mode encrypts only the data portion of each packet, but leaves the header untouched. The more secure Tunnel mode encrypts both the header and the data portion. For IPsec to work, the sending and receiving devices must share a public key. This is accomplished through a protocol known as Internet Security Association and Key Management Protocol/Oakley, which allows the receiver to obtain a public key and authenticate the sender using digital certificates. L2TP Layer Two Tunneling Protocol, an extension to the PPP protocol that enables ISPs to operate Virtual Private Networks. L2TP combines the best features of two other tunneling protocols: PPTP from Microsoft and L2F from Cisco Systems. PPTP PPTP is a networking technology that supports multiprotocol virtual private networks, enabling remote users to access networks securely across the Internet by dialing into an ISP or by connecting directly to the Internet. SSL Secure Sockets Layer is a protocol that supplies secure data communication through data encryption and decryption. SSL enables communications privacy over networks by using a combination of public key, and bulk data encryption. Kerberos An authentication system, Kerberos is designed to enable two parties to exchange private information across an open network. It works by assigning a unique key, called a ticket, to each user that logs on to the network. The ticket is then embedded in messages to identify the sender of the message.