RADIUS is a distributed client / server system, which protects the network against unauthorized access. In the Cisco implementation, Radius client running on the router to the central RADIUS server sends an authentication request, where the central server contains all user authentication and network service access information. Cisco AAA security mode to use its support for RADIUS, RADIUS can also be used for other AAA security protocols, such as, TACACS, KERBEROS, or local user name to find all the Cisco platforms support RADIUS. TACACS + is a security application, which provides users access to the router or network access server to provide centralized access authentication. TACACS + TACACS + service daemon database maintenance, which typically run in daemon UNIX or WindowsNT workstation. For the network access server can be configured TACACS + features, you must be able to access and configure the TACACS + server.
The occasion of the change of old and new year, will also be the graphics card when the market began to re-shuffle, AMDs ATI Radeon HD 2000 family of products will soon be the new alternative. This time, our focus is the new flagship: R680. R680, also known as R670, is expected to replace the Radeon HD 2900. According to the specifications given in the current AMD, R680 to support DirectX 10.1, Shader Model 4.1, PCI-E 2.0 and other technical specifications, the same integrated UVD HD engine, the core frequency up to 800MHz, equipped with 512MB or 1GB GDDR3 memory, two DVI and one to provide S-Video port, but also support DisplayPort, addition will also support multi-CrossFireX technology.