What to do when a network administrator encounters a network impassability

As a network administrator will often encounter a network of problems, especially as Internet cafes network administrators, once the network is not through the situation, while to endure the complaints of netizens, while also carrying the blame of the Internet Café boss. This taste, can imagine how painful. In this case, first of all, you have to "ignore" the spirit, because if you are too concerned about other people's reprimand, you will first from the disorderly position and can not concentrate on the question of static gas.

Quiet, quiet. After you've calmed down, you can take five steps to solve the problem of network problems:

First, check

The inspection mentioned here refers to checking the cable, which means the cable between the computer and the network interface.

If it is a small 10/100 network environment, just check open, short circuit and wiring can be, if it is Gigabit Ethernet, you also need to check whether there is crosstalk and impedance fault in the cable.

Second, confirm

Confirmation, which is to confirm that you are connected to the switch.

Once you confirm that the problem is not caused by an individual computer, you can then connect your Portable Network tools to the Office line, check to see if a link is established, and then check the port configuration to ensure that the port is available and configured on the correct virtual LAN.

Third, the application

After "confirm" and establish a link, use the tool to request a DHCP address from the server. You should ensure that the assigned addresses match the corresponding subnets, verify the subnet mask, and confirm the default gateway and DNS server addresses.

Tips:

If you fail to obtain a response from the server, it should be able to detect the appropriate subnet by analyzing the broadcast traffic. Through the Cisco Discovery Protocol (CDP) report obtained from the switch, check the switch ports that the tool is connected to and confirm the subnet configuration.

Four, Ping

Ping the devices on the network.

After you obtain a DHCP address, you can use the tool to ping a device outside the local area network (it is recommended to ping a Web site home address directly). This step will help you to verify that DHCP refers to the correct configuration, and that network data is sent correctly via routing.

V. Inspection

Check that the speed/duplex mode is set.

In fact, after the fourth step, if the network does not pass, you can first think about the previous four steps are missing, if not, please consider the operation of this step.

Link performance failures, such as duplex mode mismatch, speed mismatch, and static configuration IP address, can only be online detection. Therefore, the small part of the proposed for network management using a tool with online detection capabilities to detect. If a duplex mode mismatch is detected, verify that both the computer and the switch ports have been set to an automatic protocol.

Once all these parameters have been checked, the link between the computer and the network can be canceled. If the failure persists, you may need to use a more sophisticated network diagnostics tool.

For the method described in this article, more suitable for network management experience more rich friends, for the first time when the network management friends may be a little convoluted, or even simply do not understand. However, this does not matter, when you work long time, accumulated some experience, perhaps you will suddenly understand.