1. Domain controller: responsible for the management of all resources in the domain, the distribution of access rights and the verification of users' access to the domain.
2. Member server: a server that provides other application services or database services, such as a mail server, which is only a server that joins the domain, not a domain controller or an additional domain controller.
3. Workstation: A computer that needs to access resources on a server in the domain.
What are the characteristics and uses of several roles of computers in Windows domain? 1. User
Ordinary user group, users in this group can't make changes intentionally or unintentionally. Therefore, users can run verified applications, but they cannot run most legacy applications. User groups are the most secure groups because the default permissions assigned to this group do not allow members to modify operating system settings or user data. User groups provide a safest program execution environment. On NTFS formatted volumes, the default security settings are designed to prevent members of this group from endangering the integrity of the operating system and installed programs. Users cannot modify system registry settings, operating system files or program files. Users can create local groups, but they can only modify local groups created by themselves. Users can shut down workstations, but not servers.
2. Power users
Super users can perform any other operating system tasks except those reserved for the Administrators group. The preset permissions assigned to the super user group allow members of the super user group to modify the settings of the whole computer. However, the superuser does not have the right to add itself to the administrators group. In the permission setting, the permission of this group is second only to the administrator.
3. Administrator
By default, users in the Administrators group have unrestricted full access to the computer/domain. The preset permissions assigned to this group allow full control of the entire system. Generally speaking, a system administrator or a user with the same rights should be set as a member of this group.
4. guests
Guest group, members of which have the same access rights as ordinary group users, but the guest account is more restricted.
5. Everyone
All users, all users on this computer belong to this group.
6. System
This group has the same or even higher authority as the administrator. It will not be displayed when viewing the user group, and no user is allowed to join. This group mainly ensures the normal execution of system services and gives system and system service permissions.
What are the characteristics and uses of computer secondary language? What are the characteristics and uses of tertiary language? What am I talking about? If you want to learn computer language, you should start from the elementary level, first learn QBASIC, then learn C language, C++ and so on. Learning a language is a lonely thing. I hope you are mentally prepared!
How many kinds of memories are there in the microcomputer? What are their characteristics and functions? 1. Commonly used microcomputers include magnetic core memory and semiconductor memory. At present, microcomputers all use semiconductor memories. Semiconductor memory can be divided into random AES memory (RAM), also known as read-write memory. Read only memory (ROM for short).
1. random AES memory.
RAM has the following characteristics: it can be read and written. Do not destroy the original storage content when reading, and only modify the original storage content when writing. After power failure, the stored content disappears immediately, that is, volatility. RAM can be divided into dynamic RAM and static RAM. DRAM is characterized by high integration and is mainly used for large-capacity memory storage. SRAM is characterized by fast access speed and is mainly used for cache memory.
2. Read-only memory.
ROM is read-only memory. As the name implies, its characteristic is that it can only read the original content, and users can't write new content. The original storage content is written once by the manufacturer using mask technology and stored permanently. Generally used to store special fixed programs and data. Will not be lost due to power failure.
3.CMOS memory (complementary metal oxide semiconductor memory)
COMS memory is a chip that can store data with little energy. Because of its low energy consumption, CMOS memory can be powered by a small battery integrated on the motherboard and can be automatically charged when the computer is turned on. Because CMOS chip can get power continuously, it can store important information about computer system configuration even after it is turned off.
Microcomputer is characterized by small size, great flexibility, low price and convenient use. A monolithic micropump is formed by integrating a microcomputer on a single chip. A system consisting of a microcomputer plus corresponding peripheral devices (such as printers) and other special circuits, power supply, panel, rack and enough software is called a microcomputer system (commonly known as a computer).
Since 198 1, the first generation of microcomputer IBM-PC was launched by IBM Company of the United States, microcomputers have quickly entered various fields of society with the characteristics of accurate execution results, high processing speed, high cost performance, portability and compactness, and the technology has been constantly updated, and the products have been updated rapidly. Microcomputer has developed from a simple computing tool to a computer that can handle numbers, symbols, words, languages, graphics, images, audio and video. Today's microcomputer products have made a great leap compared with earlier products in terms of operation speed, multimedia function, software and hardware support, and ease of use.
Microcomputer is the abbreviation of microcomputer, commonly known as computer, and the accurate title should be microcomputer system. It can be simply defined as an entity composed of necessary external equipment and software on the basis of microcomputer hardware system.
There are three levels of microcomputer system from global to regional: microcomputer system, microcomputer and microprocessor (CPU). Neither a simple microprocessor nor a simple microcomputer can work independently. Only the microcomputer system is a complete information processing system and has practical significance.
A complete microcomputer system includes hardware system and software system. The hardware system consists of arithmetic unit, controller, memory (including internal memory, external memory and cache) and various input and output devices, which work in an "instruction-driven" way.
Software system can be divided into system software and application software. System software refers to the software that manages, monitors and maintains computer resources (including hardware and software). It mainly includes: operating system, various language processing programs, database management system and various tools and software. Among them, the operating system is the core of the system software, and users can only complete various operations on the computer through the operating system. Application software is a computer program compiled for a certain application purpose, such as word processing software, graphics and image processing software, network communication software, financial management software, CAD software, various packages and so on.
The development of microcomputer is usually based on the development of microprocessor chip CPU. When a new type of CPU is successfully developed, the corresponding software and hardware supporting products will be launched within one year, which will further improve the efficiency of the microcomputer system and make a new generation of microcomputer products take only two or three years to form. Intel Corporation of the United States has always been a major manufacturer of microprocessors. In fact, up to now, the history of microcomputer is also the history of Intel microprocessor.
What are the characteristics and uses of VB and VC? Vitamin B 1: Maintain normal functions of circulation, digestion, nerves and muscles; Regulating gastrointestinal function; Coenzymes forming decarboxylase participate in sugar metabolism; It can prevent beriberi.
Vitamin B2: Also known as riboflavin. Nucleoprotein is a component of many important coenzymes in the body. These enzymes can transfer hydrogen during the metabolism of substances in the body. Protein, too.
Substances and compositions necessary for sugar and fatty acid metabolism and energy utilization. Can promote growth and development, and protect eye and panel health.
Pantothenic acid (calcium pantothenate): anti-stress, anti-cold, anti-infection, preventing the toxicity of some antibiotics, and eliminating postoperative abdominal distension.
Vitamin B6: It plays an important role in protein's metabolism. Treat neurasthenia, vertigo, atherosclerosis, etc.
Vitamin B 12. Anti-fatty liver, promote liver to store vitamin A; Promote cell development and maturation and body metabolism; Treat pernicious anemia.
Vitamin B 13 (lactic acid clear).
Vitamin B 15 (pantothenic acid). It is mainly used to resist fatty liver and improve the oxygen metabolism rate of tissues. Sometimes used to treat coronary heart disease and chronic alcoholism.
Vitamin B 17. Highly toxic. Some people think it can control and prevent cancer. P-aminobenzoic acid. Among the B vitamins, it is one of the newly discovered vitamins. Can be synthesized in the human body.
Vitamin c: connecting bones, teeth and connective tissue structures; It has adhesion to capillary wall cells; Increase antibodies and enhance resistance; Promote red blood cell maturation.
How many ways can a computer insert pictures? What are their characteristics? Method one
1
Open the Word20 10 document page and click the Insert tab.
2
Click the picture button in the figure.
three
In the Insert Picture dialog box, query the picture we need, select the picture, and click the Insert button to insert it into the current document.
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Method 2
1
First open the Word20 10 document page, and then click the Insert tab.
2
Then click the picture button in the figure.
three
Query and select the target picture in the Insert Picture dialog box, and click the "Insert" lower triangle button.
four
Then we need to choose the "Insert and Link" command from the menu.
five
In this case, the picture will be * * * entered into the document and linked with the original picture. Once the original picture changes, of course, the premise is that the storage location of the file has not changed and the file name has not changed. When the file is opened again, the picture will be automatically updated. If the file name and storage location change, the pictures in the document remain unchanged.
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Method 3
First open the Word20 10 document page, and then click the Insert tab.
Then click the picture button in the figure.
Select the target picture in the Insert Picture dialog box, and then click the Insert triangle button below.
Select the Link to File command from the menu.
five
The picture will be inserted into the document as a link. If the location of the original picture changes or the file name is modified, the picture in the file will no longer be displayed.
There are several ways to view Excel20 10, what are their characteristics? Common view: the default view, which is convenient for viewing global data and structure.
Page layout: only when data is entered or a cell is selected will a page be highlighted, so that the data of each page can be clearly displayed, or the contents of the header and footer can be directly entered, but it is not convenient to view because there are too many rows (not on the same page).
Pagination preview: clearly display and mark which page. Click and drag the page break with the mouse, which can easily adjust the position of the page break and set the zoom ratio.
Custom views: You can locate multiple custom views and save different print settings, hidden lines, lines and filter settings according to user's needs, which is more personalized.
Full-screen display: Hide menus and ribbon so that the page can be enlarged to almost the whole display and used in combination with other views. Press ESC to exit full screen display.
What kinds of computer data are there? What are their characteristics? Integer data, real data, character data
How many kinds of transmission media are there in the computer network? What are their characteristics? What are its characteristics? (Three types: including twisted pair, coaxial cable and optical fiber.
Functions and features:
Twisted pair:
L) the most commonly used transmission media
2) It consists of 2, 4 or 8 insulated wires arranged in a regular spiral structure.
3) The transmission distance is100m.
4) Twisted pairs used in LAN are divided into two categories: shielded twisted pair (STP) and unshielded twisted pair; According to the transmission characteristics, it can be divided into three types of lines and five types of lines.
Coaxial cable:
L) consists of an inner conductor, an insulating layer, an outer shielding layer and an outer protective layer.
2) According to the bandwidth of coaxial cable, it can be divided into baseband coaxial cable and broadband coaxial cable.
3) The installation is complicated and the cost is low.
Optical fiber:
1) transmission medium has the best efficiency and the widest application prospect.
2) The types of optical fiber transmission can be divided into single mode and multimode.
3) Low loss, broadband, high data transmission rate, low error rate and good security.