Common faults of LAN and its elimination method

Network failure

A wide variety of computer network failures, LAN impassability, can not dial the Internet, mail is not sent out of these common network failures are at any time intrusive network users.

This chapter concisely summarizes a variety of typical network failures and troubleshooting skills, including LAN, dial-up networking, browsers and e-mail and many other aspects.

LAN fault

This section mainly introduces some typical LAN fault instances and troubleshooting tips.

As with other computer failures, the cause of LAN failure is nothing more than hardware and software two aspects, the method of solving the fault is from software settings and hardware damage two aspects to consider.

This section analyzes the cause of the fault according to the phenomenon of LAN, and gives the method to solve the problem.

1. The network is not through

This is the most common problem, the basic principle of solving the problem is first soft after hard.

(1) First from the software aspect to consider, check whether the TCP/IP protocol is properly installed, whether for each computer in the local area network has specified the correct IP address.

(2) Use the ping command to see if other computers can ping. If it does not work, it proves that there is a problem with the network connection, if you can ping but sometimes lose packets, it proves that network transmission is blocked, or network equipment contact is not good, need to check network equipment.

(3) When the entire network is not working, it may be a switch or hub problem, to see whether the switch or hub is functioning properly.

(4) If only one computer network, that is, to open the computer's "Network Neighborhood" can only see the local computer, and can not see other computers, may be the network card and switch connection problems, you should first look at the RJ-45 Crystal Head is not contact bad. Then use the wire detector to test if the line is broken. Finally, check to see if the port on the switch is working properly.

2. Connection failure

(1) Check whether the RJ45 interface is made well, RJ45 is the interface form of 10BASE-T network standard, it is now widely used, its inside has 8 trough, the line trough meaning follows the eia/tia568 International standard, in the 10BASE-T network 1, 2 line for Send line, 3, 6 line is the receiving line. When the two machines are connected, the 1, 3, 2, 6 lines need to be swapped. Otherwise, it will cause network impassability.

(2) Check the hub or switch connector is not a problem, if an interface has problems, you can change an interface to

Test.

3. Network card failure

(1) The problem of the network card is not obvious, so it is best to test the network cable first, then test the network card, if you have the condition, you can use the measuring instrument or multimeter to test.

(2) Check that the NIC installs the driver correctly, if the driver is not installed, or if there is a problem with the driver, reinstall the driver.

(3) Hardware conflict. Need to see what hardware conflicts, then modify the corresponding interrupt number and I/O address to avoid conflicts, some network adapters also need to be set in the CMOS.

4. Virus failure

There are many viruses on the Internet that can attack LAN, such as red Code, blue Code, Nimda and so on. In addition to slowing down the computer, some viruses can block the network, causing traffic jams. To deal with these new viruses, most virus manufacturers, such as rising, KV3000 and so on, are not coping on their homepage. Here must pay attention to, do not follow the usual anti-virus methods to antivirus, the anti-virus software must be scheduled to upgrade.