computer knowledge book

the operating system.2.5 VGA (video Graphic Array)The display of the graphic image, focusing on the resolution and color concentration, each image display color will occupy memory, video card above the capacity of a memory flicker. Video card communicates with CPU and memory via North BridgeGraphics Specifications PCI---> AGP----> PCIE2.6 HDD InterfaceHda generally refers to the IDE interface of the hard disk, HDA generally refers to the first hard disk, similar to the HDB,HDC, etc.SDA generall

family. For example, the family names of the famous CIH virus are unified "CIH ", in addition, the family name of the recently popular wannacache worm is "Sasser ". A virus suffix is a variant of a virus. It is used to distinguish a variant of a specific family of viruses. Generally, 26 letters are used for representation, such as Worm. sasser. B Refers to B, a variant of the worm, which is generally referred to as "B variant" or "B variant ". If the virus has many variants (It also indicates t

Port concept: in network technology, Port has two meanings: one is physical Port, for example, ADSL Modem, Hub, switch, router is used to connect interfaces of other network equipment, such as RJ-45 port, SC port and so on. The second is the logical port, which generally refers to the port in the TCP/IP protocol. The port number ranges from 0 to 65535, for example, port 80 used to browse Web Services, port 21 for the FTP service. This article mainly summarizes the TCP/IP ports that are commonly

1. IntroductionWhat is a digital system?A digital system (or digital system) defines how a number is represented by a unique symbol.There are two types of digital systems: positional digital systems and non-positional digital systems.2. Position Digital SystemIn a positional digital system, the position that the symbol occupies in a number determines the value it represents.(1) Decimal System① integer② Real numbers(2) binary system① integer② Real numbers(3) Hex system① integer② Real numbers(4) O

obtain the required network resources, and the server provides the client with the required network resources. It is a software system architecture. It can take full advantage of the advantages of both ends of the hardware environment, and assign tasks to the client and server, thus reducing the communication overhead of the system. Currently, most application software systems are structured in the form of client/server. As the current software application system is developing towards distrib

For computer beginners, eager to learn all the skills of the computer, it is impossible, only step-by-step, today to teach you computer beginners must learn computer skills, as the basis of learning computer knowledge. 1, in Note

are not only single-core, a single chip on the processor core, but also multi-core, that is, on a single chip above the integration of two or more processor cores, each of which has its own logic unit, control unit, interrupt processor, operational unit, first-level cache and level two cache sharing or unique, The integrity of its components is identical to that of a single-core processor core. We pass a picture and look at the composition of the CPU Let's take a look at the storage archite

Computer now has become a daily necessities of life, then how much do you know about computers? The following small series for you to organize some common computer hardware knowledge, quickly to learn! Computer hardware, including all the physical parts of a computer, to di

Computer now has become a daily necessities of life, then how much do you know about computers? The following small series for you to organize some common computer hardware knowledge, quickly to learn! Computer hardware, including all the physical parts of a computer, to di

The knowledge that you want to understand Linux port mappings is actually very simple. So now let's take a look at the mystery of it! 01 Ssh-c-G root@127.0.0.1-l 5000:61.235.139.123:5000 02 03 #输入机器的root密码 04 05 #后台执行: 06 Ssh-c-f-n-G root@127.0.0.1-l 5000:61.235.139.123:5000 07 08 #另: 09 10 Ssh-c-f-n-g-r Remote_port:local:port user@remotehost You can bind the remote server port Remote_port to the local port, where-c is data compressio

　　Computer hard disk is a very important part of the computer. Computers will not work if the computer's hard drive fails. Here to introduce the computer hard disk related knowledge: The hard drive on the market is divided into two main categories: IDE and SCSI. SCSI hard disk has fast, large capacity, the use of stab

): ... Self.name,self.age = name, age ... def __func__ (self): ... Return "This guy is {self.name}, was {self.age} old". Format (self=self) ... >>> s =person (' Jihite ', 4) >>> s . __func__ () ' This guy is Jihite, was 4 old 'Go back to the top by subscript>>> ' {0[0]} is {0[1]} years old! '. Format ([' Jihite ', 4]) ' Jihite is 4 years old! ' >>> ' {0} is {1} years old! '. Format (' Jihite ', 4) ' Jihite is 4 years old! 'is actually through the locationFormat qualifierThrou

the outside can be multiple, we get a list, which means that sys.argv can actually be seen as a list, so we can use [] to extract the elements. The first element is the program itself, followed by the externally given parameters.Below we illustrate its usage with a very simple test.py program running results.Import SysA=SYS.ARGV[0]Print (a)Save the test.py in the root directory of the C drive.In the program, locate the ' run ', click-to-enter "cmd" and return Enter the console command window (e

Get_sample () as Sample: Print ( "Sample:", sample) Execution results are[Python] In __enter__ () Sample:foo In __exit__ () 1. The __enter__ () method is executed2. The value returned by the __enter__ () method-This example is "Foo", assigned to the variable ' sample '3. Execute code block, print variable "sample" with the value "Foo"4. The __exit__ () method is called with the real power that it can handle exceptions. You may have noticed that the __exit__ method of t

:#coding =utf-8Import OSOs.system (' e:\\test_object\\all_test.py ')OrImport OSOs.chdir ("E:\\test_object")Os.system (' Python all_test.py ')----------------- All files under the directory can be obtained by Os.listdir () Through Os.path.getmtime (path) #返回在此path下最后一次修改的时间 Connecting directories and filenames via os.path.join (path, name) #coding =utf-8Import OS#定义文件目录Result_dir = ' E:\\test_object\\report 'Lists=os.listdir (Result_dir)#重新按时间对目录下的文件进行排列Lists.sort (Key=lambd

the computer network knowledge point combing of interview must test Transport Layer Overview Function: The transport layer provides communication services for the application layer above it. In the OSI seven-layer reference model, the transport layer is the highest level of communication-oriented and the bottom of user functionality. Two important functions of the transport layer: multiplexing and separat