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- What are the differences between mesh networking and wireless bridging?
- Differences: 1. Different networking modes. Wireless bridge communicates in point-to-point or point-to-multipoint mode. Antenna applications are mainly directional transmission. In Mesh ad hoc network, all devices have equal status in the wireless network. Any A network node can access the wired network. 2. The transmission distance is different. 3. The transmission rates are different. The bridge transmission rates are mainly 300Mbps and 866Mbps. The Mesh rate is not obvious compared to the traditional bridge. 4. The communication frequencies are different. What is mesh networking? Mesh networking is a "wireless mesh network". It is a "multi-hop" network. It is developed from the adhoc network and is one of the key technologies to solve the "last mile" problem. Evolving to next-generation networks
- Safety 9894 2023-05-24 17:54:28
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- NTP configuration example analysis
- 1. Configure the network device as an NTP server. 1. Configure the NTP master clock ntp-servicerefclock-master22. Enable NTP authentication ntp-serviceauthenticationenable3. Configure the NTP clock source local interface, which does not need to be configured. ntp-servicesource-interfaceloopback04, configure the NTP server service authentication password ntp-serviceauthentication-keyid1authentication-modemd5cipheradmin5, configure the trusted secret key number ntp-servi
- Safety 1807 2023-05-24 15:01:06
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- What are the 9 commonly used automated testing frameworks for Android?
- Difficulties in automated testing of mobile APPs Automated UI testing of mobile APPs has long been a difficulty. The difficulty lies in the "changes" of the UI. Changes lead to a large number of maintenance of automated use cases. From the perspective of layered testing, automated testing should be performed layer by layer. The largest amount of automated testing should be unit testing, which is the easiest to implement and find problems at an early stage; followed by interface-level testing, which is automated for the purpose of verifying logic. Since the interface is relatively stable, the cost of automated testing is relatively acceptable; The largest automation cost is UI-level automated testing. However, the UI interface is a direct feedback display to the user. Moderate, especially BVT-level automated testing is also very necessary. In order to get rid of these, some automated testing needs to be introduced
- Safety 1601 2023-05-24 14:41:31
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- How to use Cryptsetup to encrypt USB flash drive
- Nowadays, the storage and data transmission capabilities of U disks are very strong, and they can run across various platforms. The storage space has even reached 256G, which is comparable to the capacity of ordinary hard disks in the past. Here, we will show you how to encrypt a USB flash drive, so my mother no longer has to worry about me following in the footsteps of Teacher Chen... The Importance of Protecting USB Flash Drives Theft of laptops and USB flash drives has been one of the main causes of data breaches in the past few years. However, compared to laptops, people usually pay less attention to the security of USB flash drives. But if a criminal steals a USB flash drive worth only $12, it may cost a company around a million dollars. As U disk storage capacity increases and its price gradually decreases, you can easily
- Safety 1641 2023-05-24 13:07:39
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- What is the principle of fragmentation and assembly of IP datagrams?
- When a piece of data is sent from one host to another through a router, it must be forwarded through many routing layers. The process is quite complicated, so in what form does IP forward the datagram to the destination host at the routing layer, and how does it process it? First we need to understand the format of the datagram: IP forwarding and control are determined by the header of the IP datagram. The value of the 4-bit header length is based on 4 bytes. The minimum value is 5, which means that the header length is the smallest. It is 4x5=20 bytes, which is the IP header without any options. The maximum value represented by the 4-bit table is 15, which means that the maximum header length is 60 bytes. The 8-bit TOS field has 3 bits to specify the IP The priority of the datagram (currently obsolete), there are 4 bits to indicate
- Safety 3266 2023-05-24 11:12:13
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- How to analyze the rpm package management function
- Rpm package management function fully understands the function of software package management: packaging the components of the compiled program into one or several package files, in order to facilitate the installation, upgrade, uninstallation, query, verification, and database of the program package maintain. Let's take a look at the analysis of RPM package management. Rpm packages have great applications in redhat and S.U.S.E. Next, we will do some detailed functional analysis on the management of rpm packages in the centos system. Using yum (rhel series), it can be automatically installed during installation. Resolve dependencies drpm package naming format: name-VERSION-release.arch.rpmVERSION: major.minor.releaseMajor
- Safety 1449 2023-05-24 09:01:05
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![[Defect Weekly] Issue 31: Wrong memory release](https://img.php.cn/upload/article/000/887/227/168485445614044.jpg?x-oss-process=image/resize,m_fill,h_100,w_220)
- [Defect Weekly] Issue 31: Wrong memory release
- 1. Wrong memory release method. Common memory application functions in C language include malloc(), realloc(), and calloc(). Although they have different functions, they all correspond to the same memory release function free(). The function of memory in C++ Application and release adopt new/delete, new[]/delete[] methods. Regardless of whether it is C language or C++ language, when writing source code, you must choose the memory release method according to the different memory application methods to avoid using the wrong memory release. For example: mixed use of C/C++ memory allocation/release, or mixed use of scalar and vector memory allocation/release. 2. The harm of wrong memory release method. Using the wrong memory release method,
- Safety 1534 2023-05-23 23:07:35
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- How to configure Cisco 2960
- Enable SNMP service SW_21_251(config)#snmp-servercommunitypublicROSW_21_251(config)#snmp-serverenabletrapsSW_21_251(config)#snmp-serverhost10.80.21.188publicVTY password encryption SW_21_251(config)#servicepassword-encryptionbanner configuration SW_21_251(config)#bannermotd #WelcomeCT_Switch1
- Safety 1580 2023-05-23 23:01:04
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- How does the Struts2 S2-059 remote code execution vulnerability reproduce?
- 0x00 Introduction Struts2 is a very powerful JavaWeb open source framework launched by the Apache software organization, which is essentially equivalent to a servlet. Struts2 is based on MVC architecture and has a clear framework structure. It is usually used as a controller to establish data interaction between models and views, and is used to create enterprise-level Java web applications. It utilizes and extends the JavaServletAPI and encourages developers to adopt the MVC architecture. Struts2 takes the excellent design ideas of WebWork as the core, absorbs some advantages of the Struts framework, and provides a neater Web application framework implemented in the MVC design pattern. 0x01 vulnerability
- Safety 1600 2023-05-23 22:37:16
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- How to use HCL for Telnet remote login
- The following will introduce to you how to use the hcl simulator to configure remote login of the device and test it. 1. Open HCL and draw the topology map correctly ps: Since the HCL virtual host cannot perform Telnet verification, add a local host for testing 2. Enter the device and correctly configure the device for remote login system-viewintg0/0ipadd192.168.1.124 (Configure remote login IP)quittelnetserverenable (Open Telnet service) linevty04set-authenticationpasswordsimple123 (Set authentication password) user-rolenet
- Safety 1895 2023-05-23 21:04:22
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- What are the security risks if the SDK is not hardened?
- What security risks will exist if the SDK is not hardened? 1. It is easy for competing products or malicious parties to peek into the internal implementation details or internal calling processes, and may even leak private data. Most of the Android platform SDKs are written in Java and are easy to be decompiled. If it is just a simple obfuscation, it is easy to spy on the internal implementation details; if there is some private data inside the SDK, it is easy to be leaked. More importantly, if these details involve key technology implementation points, it is tantamount to leaking core technology. 2. Malicious advertisements or malicious code are implanted by malicious actors through bytecode injection and other means, and then repackaged and released. Due to the particularity of the SDK, there is no signature verification logic like App, so once the malicious actor implants it in your SDK some malicious code or
- Safety 1278 2023-05-23 17:05:14
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- How to understand scroll
- scroll width and height scrollHeight scrollHeight represents the total height of the element, including the invisible part that cannot be displayed on the web page due to overflow scrollWidth scrollWidth represents the total width of the element, including the invisible part that cannot be displayed on the web page due to overflow [Note] IE7-Browser The return value is inaccurate [1] When there is no scroll bar, the scrollHeight and clientHeight attributes are equal, and the scrollWidth and clientWidth attributes are equal //120120console.log(test.scrollHeight,test.s
- Safety 1514 2023-05-23 13:40:32
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- How to perform route-map parsing
- 1. Route-map analysis 2. Experimental topology 3. Experimental configuration R1 configuration interfaceSerial0/0ipaddress12.1.1.1255.255.255.0interfaceSerial0/1ipaddress13.1.1.1255.255.255.0interfaceSerial0/2ipaddress14.1.1.1255.255.255.0routereigrp90redistributeosp f110metric150010025511500network14.1.1.00.0.0.255
- Safety 1219 2023-05-23 12:01:07
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- Example analysis of WvEWjQ22.hta Trojan rebound shell sample
- IZhongbao received a call from a customer at night, saying that a suspected attack had been detected and asked me to conduct emergency response and trace the source. I was helpless and had no choice but to get up from the bed and pick up my notebook. Through preliminary analysis, it was found that WvEWjQ22.hta executed a powershell process. After in-depth analysis and judgment, it was found that the traffic had been Base64 encoded twice + Gzip encoded once. The ShellCode decoded by reverse analysis and debugging was a TCP rebound shell generated by CS or MSF, and the source was finally traced. Find the attack IP and end the Powershell process and TCP rebound shell process. II attack method uses the WvEWjQ22.ht Trojan encoded three times to bypass the situational awareness system detection and early warning execution powers
- Safety 1294 2023-05-23 11:28:24
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- Example analysis of Spring Boot Actuator's unauthorized access to getshell
- The boss of the preface department dug up this vulnerability in a certain src. It was an old hole. I thought it was interesting, so I set up a local environment to test it. Actuator is a functional module provided by springboot for introspection and monitoring of application systems. With the help of Actuator, developers can easily view and collect statistics on certain monitoring indicators of the application system. When Actuator is enabled, if relevant permissions are not controlled, illegal users can obtain monitoring information in the application system by accessing the default actuator endpoints, leading to information leakage or even server takeover. As shown above, the actuator is springb
- Safety 2179 2023-05-23 08:56:32
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