Eccouncil Exam 312-38 Topic 9 Question 24 Discussion

Answer should be B and D. Functions of a VPN Concentrator A VPN concentrator adds more security controls to the router, improving the security of the communication. The functions of a VPN concentrator are as follows: ? Data encryption: The VPN concentrator encrypts the data. Being bi-directional, it initially encrypts the plain packets it receives and later decrypts them at the end of the tunnel before sending them to the destination. ? Managing tunnels: By adding the features of advanced data and network security, a VPN concentrator has the ability to create and manage large VPN tunnels. These tunnels ensure data integrity among the systems. ? User Authentication: A VPN concentrator authenticates users at either the computer level or at the user level. Authentication at the computer level takes place using the Layer Two Tunneling Protocol (L2TP) protocol whereas authentication at the user level takes place using the Point-to-Point Tunneling Protocol (PPTP). ? Traffic handler: A VPN concentrator routes the tunneled and non-tunneled traffic depending on the server configuration. It simultaneously handles traffic of a corporate network as well as Internet resources