Shulou(Shulou.com)06/02 Report--

Network operation and maintenance-related knowledge of setting BIOS password BIOS:

BIOS is the abbreviation of Basic Input-output System (basic input and output system). It is responsible for initializing and testing the hardware of the system to ensure that the system can work properly. If the hardware is abnormal, stop working immediately, and feedback the wrong device information to the user. BIOS includes system power-on self-test (POST) program module and system startup bootstrap program module, which are mainly responsible for the communication between motherboard and other computer hardware devices.

In fact, to put it simply, BIOS is a group of programs that are "solidified" in computer hardware, which provides the lowest and most direct hardware control for your computer. BIOS is actually equivalent to a bridge between computer hardware and software programs, and it is actually a program or software. Our most intuitive understanding of it is the POST (Power On System Test) function. When the computer is powered on, BIOS will test all its internal devices, including CPU, memory, read-only memory, system motherboard, CMOS memory, parallel and serial communication subsystems, floppy disk and hard disk system, and keyboard. After the self-test is complete, the system will look for the operating system in the specified drive and load the operating system into memory.

So where is the BIOS program stored on the computer? BIOS's home is CMOS memory. CMOS is the acronym for complementary metal-oxide semiconductor and complementary metal oxide semiconductors in Chinese. It is a semiconductor technology that integrates pairs of metal oxide semiconductor field effect transistors (MOSFET) on a silicon wafer. This technology is usually used in the production of RAM and switching application systems. The products produced by it are very fast, low power consumption, and have high tolerance to the interference of power supply. For us, this refers to a special RAM chip on the computer motherboard, which is usually 128byte or 256byte RAM. The function of CMOS RAM is to save the hardware configuration of the system and the user's settings for some parameters.

So after understanding the basic knowledge of BIOS, we will do a small experiment today to set the password of BIOS to ensure the security of the computer system.

Lab tasks:

Ensure the security of computer system by setting BIOS password

Ideas and steps:

When the computer is powered on, enter the BIOS through Dell or F2 key, set the password, save and exit, verify and enter the user password, and enter the administrator password in verification.

Specific operation steps: 1. Open the virtual machine, click, find to turn on the power to start the firmware, the real machine generally press the Dell key or F2 key into the BIOS (different brands of computers into the BIOS method is not the same ah, here do not give you one by one list, if you do not know how your computer into the BIOS, you can ask me at any time can also find our dear du Niang Oh), here I use the VMware virtual machine to experiment for you. two。 Go to the BIOS settings interface

3. Select the Security option

4. Set administrator password save

5. Set user password save

5. Confirm the opening password

6. Save settings to exit

(you can also save and exit directly through F10).

Result verification

Press DEL or F2 to enter BIOS

(1) enter the user password

The option is grayed out, which proves that the setting password cannot be changed.

(2) enter administrator password

You can select an option to prove that you can change the setting password.

In this way, we can prevent others from changing our BIOS by setting the administrator password and the user password.

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