CISC Complex Instruction Set (Complex Instruction Set Computer)
CISC is traditional processor architecture, instruction format for a longer and much slower speed of execution, but also easy to program development and learning, and reduced instruction set architecture (RISC) the opposite.
Basically, the computers used can be divided into CISC CPU architecture and Risotto kinds of difference between the two is stored in the CPU of the Instruction Set(Instruction set) the number of different. In the 80's, memory, slow and expensive, CISC processor architecture is almost grasping the pulse of the overall market.
Not only can effectively shorten the new CISC instruction microcode design time; due to micro-program instruction format and exchange high-level language, the compiler does not necessarily need to be rewritten. However, because the instruction set and chip design complexity, different instructions require different clock cycles to complete the implementation of a relatively slower pace of instruction will affect the implementation of the efficiency of the whole machine.
Compared with the RISC architecture, CISC instruction are many and complicated, slow and not easy to program development and design, while the file size is relatively large. In the 90's until the mid-shelf in most CISC processors have adopted, including the Intel (Intel), as well as the 80x86 MOTO Laura (MOTOROLA) of the 68K series.
CISSP Information Systems Security Professional (Certified Information Systems Security Professional Exam)
CISSP is an internationally recognized information security professionals the most authoritative license by the International Information Systems Security Certification Consortium awarded (ISC) 2.
(ISC) 2 was founded in 1989, the headquarters was established in North America, defined as independent, non-profit organizations, business objective is to develop and manage an information security management certification framework. The organization since 1992, conducted by CISSP certification, the industry quickly gained international recognition, and is considered the best return on investment of professional licenses.
CISSP certification covers a wide range of professional fields, including the implementation of information security management, access control systems and methods, communications and network security, cryptography, operations security, applications and systems development security, IT law, computer crime investigation and computer ethics, physical security. Not only that, CISSP certification also requires qualification exam, you must have 3 to 5 years of IT experience.
In general, the CISSP is very difficult to pass. According to the survey, as of 2003, the number of global access to CISSP certification lasts from 3,4 thousand of the spectrum, CISSP thereby becoming information security professionals as the best shortcut worth gold.
In recent years, China began to attach importance to the value of information security certification, there are many IT industry actively encourages its employees across the sea to acquire CISSP, related education and training courses in Taiwan one after another enrollment, the formation of Certified Information Security or education industry, another business competition.
Clone
Clone is the assembly of non-branded computer, with everyone used to say the self-assembly (DIY) computers the same meaning. Clone is the computer industry-specific terminology. DIY vendors selling computers often referred to as Clone industry.
Clone and White Box concept is identical, but different definitions. Some major IT companies such as Dell Computer (Dell) but also a type of computer products produced in assembly, but the industry often called White Box, and the Clone mostly on their own to the computer industry meet the demand for wholesale purchases of computer equipment components, followed by re-assemble the DIY products, but with well-known brands of computers are compatible.
Clustering (cluster)
Will be two or more computers linked together, who usually refers to the number of servers linked together, they can share the workload on the one hand, if one of the failure, the other can serve as a rescue mission to ensure the operation of their computer does not break. Each server can use multi-processor systems, for example, if four computers clustered together, each with 4 CPU (processor), then such a cluster is equivalent to a 16 CPU servo device.
The advantages of the server cluster to provide fault tolerance (fault tolerance) and load balancing. In other words, if one server fails, other servers can still remain operational; malpractices and the load-balancing the workload evenly distributed in a few sets on the server. |
