What is a firewall? Can we really prevent fire?

What's the use of acting ARP?

Proxy ARP technology allows devices in the same network segment to isolate communication through a route. The video shows that although PC1 and PC2 are in the same network segment, they cannot communicate directly because they are isolated by routes. When PC1 attempts to reach PC2 through an ARP request, the request cannot cross the router. At this time, enable the proxy ARP function of the router, and the router will respond to the ARP request and impersonate the MAC address of PC2 to realize the possibility of communication. This method needs to ensure that the router can correctly identify and reach the corresponding network address. Although the proxy ARP simplifies the configuration, it also has security risks, because it essentially involves a kind of "good faith deception".

Huawei 2023 new simulator ENSP Pro installation method ① Linux based deployment Xiao Ge

This technology sharing involves deploying Huawei's ESP Pro software using VMware Workstation and Ubuntu systems in the Windows 10 environment. First, it introduces the creation and configuration of virtual machines, including the recommended hard disk, memory specifications, and processor virtualization support. It emphasizes the selection of bridging mode for network settings, the realization of automatic IP acquisition of virtual machines, and the specific steps of Ubuntu system installation. The method of enabling root user and importing ESP Pro software through SSH, MobileX tools and script automation are further elaborated. Finally, it details how to start and access the ESP virtual machine service, and how to stop the service. The content is applicable to developers, system administrators, IT majors who need to deploy enterprise software in a virtual environment, and technology enthusiasts who are interested in virtualization and Linux system installation.

How to configure Huawei switch stacking technology

This content involves the technical details and steps of the stacking configuration of Huawei's mixers. The first step is to assign a stack number to identify the equipment sequence; Although this step is optional, it is helpful to manage and differentiate devices. The second step is to configure the priority of the switch, which determines whether the switch becomes the main switch and is responsible for managing the stacking system; This step is also optional, but higher priority helps to be selected as the primary switch. The third step is to configure logical stack interfaces and add physical interfaces, involving numbering and interface crossing rules. During the whole stacking process, the device not selected as the master switch will be automatically restarted. These operations are common to network engineers and are critical to understanding and configuring enterprise class switch networks.

One Excel formula to sort all data

This content deeply discusses the efficient data processing methods using REDUCE, UNIQUE, LAMBDA, FILTER and other functions in Excel. Through specific formula demonstration, the video shows how to classify the table data according to the class, and add blank lines to distinguish the information of different classes, so as to achieve a clear display of data. In addition, it also explained the well number NA errors that may be encountered in the process of data consolidation, and shared the skills of error handling using FNA functions to ensure the accuracy of the output results. This technical content is very suitable for scenarios requiring data classification, screening and cleaning, such as educational data management, accounting statement sorting, etc., and can help workers improve the efficiency and accuracy of data processing in Excel.

Difficulties of morning soft exam solved in 5 minutes (I)

The core of this course is to teach how to calculate the memory address, especially how to determine the memory storage capacity from the hexadecimal address. For specific examples, this paper explains the addition and subtraction of hexadecimal numbers and the method of converting them to decimal numbers, and calculates the capacity of specific memory areas through these technical means to finally determine the answer. The content is intended to consolidate learners' understanding of memory addressing and number system conversion, and is very suitable for students who are new to computer science or participate in computer related professional examinations to study and review.

Use of soft exam simulation practice platform and drawing operation

The video details how to use the soft exam simulation exercise platform, from login operation to the complete guidance of the exam process. First of all, the user needs to log in with the account password when registering, enter the simulation admission card number, and confirm that the personal information is correct. The video also shows the examination room rules viewing, operation guide, answer methods (including multiple choice questions and calculation questions), marking problems, using the calculator function, switching between automatic and manual skip questions, time management, and paper submission process. In addition, it introduces the input method of calculation questions, the use of drawing tools, and the input of special characters. The content is intended for candidates who are preparing to take the soft test. Especially for novices, the video provides a specific demonstration of practical operation.

What to do if Huawei S series switches forget the password of the Console interface

This content solves the problem that Huawei S series switches forget the password of the Console interface, and details three different solutions. The first is to change the Console password through SSH, Telnet, or Web and other login methods. If these methods are not feasible, try the second strategy, that is, clear the switch configuration or restore factory settings, and log in with the default account. The third method is to reset the Console password through the BootROM interface while preserving the configuration. Each method is coordinated with specific operation steps, and is suitable for technicians and network administrators with certain network equipment maintenance experience.

Why does OSPF divide into multiple areas?

This content analyzes the necessity and advantages of OSPF to divide multiple regions in a large network environment. The dual ABR design improves the reliability of the network and avoids the single point of failure affecting the overall network. The multi region design reduces the transmission range of link state announcement (LSA) and the size of link state database (LSDB), thus saving router resource consumption. In addition, it is also discussed that routing summary and routing filtering can be more convenient through region division, so as to control the size of routing table and implement more effective routing control on the region boundary. Multi area network design also promotes the scalability of the network, making it more suitable for the needs of large-scale network environment.