How to solve the problem of network failure?

The problem of Internet access is not solved for any one person, but the network problem seems to be a little difficult for ordinary people, but as a network administrator often I will encounter the problem of network failure, especially as the network administrator of the Internet cafe. Once I encounter the network failure, I have to endure the complaints of netizens and bear the blame of the Internet cafe owner. This kind of taste can be imagined how uncomfortable it will be. In this case, first of all, you must have the spirit of "by the wind", because if you care too much about other people's swearing, you will first be self-confident and unable to calmly consider the problem. However, the network problem is actually not as difficult as it might seem.

Quiet, quiet. After you are quiet, you can consider the following five steps to solve the problem of network failure:

First, check

The check here refers to checking the cable, that is, the computer and Cable between network interfaces.

If it is a small 10/100 network environment, just check for open circuit, short circuit and wiring. If it is Gigabit Ethernet, check the cable for crosstalk and impedance faults.

Second, confirm

Confirm, that is, let you confirm whether it is connected to the switch.

Once you've confirmed that it's not caused by an individual computer, you can connect the portable network tool to the office line, check if the link can be established, and then check the port configuration to make sure the port is available and the correct virtual LAN is pressed. Configure it.

Third, the application

After the link is confirmed, and the link is established, use the tool to request a DHCP address from the server. Make sure that the assigned address matches the corresponding subnet; verify the subnet mask; confirm the default gateway and DNS server address.

Tip:

If you fail to get a response from the server, it should be able to detect the corresponding subnet by analyzing the broadcast traffic. Check the switch port to which the tool is connected and confirm the subnet configuration through the Cisco Discovery Protocol (CDP) report obtained from the switch.

Four, Ping

Ping the devices on the network.

After obtaining the DHCP address, you can use the tool to ping a device outside the LAN (recommended to directly ping a website homepage address). This step can help you confirm that the DHCP configuration is correct and that the network data is correctly routed.

V. Inspection

Inspection, which is the speed/duplex mode setting.

In fact, after the fourth step, if the network does not pass, you can first think about whether there are any omissions in the previous four steps. If not, please consider this step again.

Link performance failures, such as duplex mode mismatch, speed mismatch, and static configuration of IP addresses, can only be detected online. Therefore, Xiaobian suggested that the network management system use a tool with online detection function for detection. If a duplex mode mismatch is detected, verify that both the computer and switch ports have been set to auto-protocol.

Once all these parameters have been verified, the link between the computer and the network can be cancelled. If the fault persists, you may need to use a more sophisticated network diagnostic tool.

As an administrator, these network problems should be very small pediatrics. This tutorial is mainly for network administrators, but because the article is easy to understand, you can learn to do it if you are interested. do.