With the continuous improvement of informatization, LAN has many advantages, such as convenience, high transmission rate, resource sharing and so on. Therefore, in the use of LAN, various network failures are inevitable. Below, I searched and sorted out the diagnosis and elimination methods of LAN network faults for everyone. Welcome to read, I hope it will help you! For more information, please continue to pay attention to our fresh graduates training network!
The informatization construction of safety production is a basic work to improve the level of safety production in mines. Science and technology promote coal? An important means of strategy. Network troubleshooting is a comprehensive technology, based on the knowledge of network principle, network configuration and network operation.
1, common network faults in local area network
1. Classify according to the nature of network faults.
(1) Hardware failure
Whether the network equipment is connected normally, whether the network card is installed normally, whether the network circuit is broken, whether the wiring between the circuit and the network module is correct, and whether the power supply and connection ports of network equipment such as switches and routers are normal.
(2) Software failure
Network software fault is much more complicated than network hardware fault. Network software failure is mainly reflected in the degree of network card driver, which depends on whether the network protocol is correct, IP address allocation is correct, router configuration is accurate, VLAN or subnet division is correct, and whether there is virus.
2. According to the classification of network fault objects
(1) Port failure: Port failure usually includes loose plug and physical failure of the port itself.
(2) Line failure: In daily network maintenance, the line failure rate accounts for about 70% of network failures. Line failures usually include network line and crystal head damage and network failures caused by serious electromagnetic interference of lines.
(3) Hub, switch or router failure: Hub, switch and router failure here refers to physical damage, failure to work, leading to network failure.
(4) Host failure: This kind of failure usually includes network card contact failure, network card looseness, network card physical failure, host network card slot failure and host itself failure.
2, network fault performance and troubleshooting steps
1. Performance of network failure
In the process of daily maintenance and management, although there are many kinds of LAN network failures, their performances can be summarized as the following types:
(1) The computer cannot log on to the server;
(2) Computer users cannot access online neighbors;
(3) The computer can't browse intranet pages from the local area network, or can't receive emails from the local area network;
(4) Computers can browse intranet pages and send and receive intranet mails, but they can't surf the Internet;
(5) The computer cannot access the Internet through the proxy server, or the computer can only communicate with computers in some local area networks;
(6) The running speed of computer network programs is slow.
2. Network troubleshooting steps
For the network fault, we should first diagnose the performance of the network fault, list and analyze the causes of the fault, narrow the scope, locate the causes of the fault, find the root of the problem, and finally take corresponding troubleshooting methods to solve it. Specifically, the following steps can be followed.
(1) Identify the problem
The first step in analyzing network faults is to clearly describe the phenomena and symptoms of faults.
(2) Collecting factors
Use relevant tools to test and collect the required information to help isolate possible causes of failure.
(3) consider possible reasons
Through concentrated thinking, the problems are classified, some impossible problems are excluded first, and the possible reasons for failure are considered according to the collected situation.
(4) Create a diagnosis plan
According to the possible faults determined in the previous step, the corresponding diagnosis scheme is formulated.
(5) Implementation plan
First of all, only one most probable cause of the fault is used for the diagnostic test, so that it can be easily restored to the original state of the fault.
(6) Make records.
Record every step and the final solution to improve your ability to support the network.
3, network troubleshooting methods
In this paper, network faults are classified according to their nature, namely hardware faults and software faults. When checking the network fault, generally check the hardware fault first, and then check the software fault.
1. Hardware troubleshooting methods
Network hardware failures are mainly manifested in lines, ports, network cards, information sockets and so on. Once the network fails, the first thing that comes to mind is to check the physical lines and hardware equipment of the network.
(1) line troubleshooting method
In daily network maintenance, the line failure rate accounts for about 70% of network failures. For the faults caused by twisted pair, including the damage of network cable and crystal head, incorrect line sequence and return loss caused by too long network cable, replacement method or line tester can be used to determine whether it is a network cable problem.
(2) Port troubleshooting methods
The most intuitive method is to check whether the status of the signal lamp is normal. If it is close, first check the indicator lights on the network card, hub, switch and router panel.
(3) Troubleshooting methods for hubs, switches or routers
① If it is suspected that there is a problem with the hub or switch, usually the simplest method is to replace the exclusion method and replace the original hub or switch with a normal hub or switch.
(2) Determine that it may be a router or modem problem. Open the router address or modem address through IE to see if the settings have been changed, and then see if the running status is normal. If the operation is normal and the network is blocked, other problems should be considered, not the router or modem. Of course, from its indicator light, you can simply judge whether the connection is normal.
(4) Troubleshooting method of host computer
This paper mainly introduces the situation that the host computer and the network card can't work together. The solution to the contact fault of the network card is to pull out the network card, wipe off its oxide layer with an eraser and then insert it for use. The best solution for host network card looseness and network card slot failure is to replace the network card slot.
2. Software troubleshooting methods
(1) Troubleshooting for Improper Installation of Network Card Driver
In the device manager window, check the network card options to see if the driver is installed properly. If the network card model is marked before? ! ? Or? x？ , indicating that the network card cannot work normally at this time. The solution is simple, just find the right driver and reinstall it.
(2) Elimination method of improper setting of host network address parameters.
Check the Connection Properties window in My Network Places Properties to see if the TCP/IP option parameters are set correctly.
(3) Troubleshooting methods for improper installation of host network protocols or services.
Check whether the installed protocol is consistent with other hosts in the Network Neighborhood Properties or Local Connection Properties window.
(4) The method of eliminating the conflict between network card devices.
Most disks are accompanied by programs to test and set the parameters of network cards, and check the connector type, IRQ, I/O port address and other parameters set by network cards respectively.
(5) Close some important processes or ports. Try to Ping the port near the line to see if it can be pinged.
In short, with the expansion of coal mine production scale, the situation of safety production is becoming more and more complicated, and the amount of data and information of safety production is increasing sharply. It is imperative to use computer network technology to guide and serve the work of safety production, establish an efficient, sensitive and reliable information system, grasp the trends of safety production in time, improve the level and efficiency of safety production supervision and management informatization, and comprehensively promote the construction of safety production informatization.
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