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90% of people have fallen into this network failure trap. Have you fallen into this trap? 

In daily life and work, network problems are always a headache. The device is connected to Wi-Fi, but why can't it access the Internet? The network speed should be very fast, but why is it so slow to open a web page? Today, we will take stock of the network failure pits that 90% of people have stepped on, and see if you have been hit! 

1. The device is connected to Wi-Fi, but cannot access the network
Possible reasons:

IP ​​conflict: The device obtains the wrong IP address, resulting in an inability to access the network.
DNS setting error: The device may not be able to correctly resolve the domain name, resulting in the inability to open the web page.
Router problem: The router may be stuck and needs to be restarted.



Solution:

Run ipconfig /release && ipconfig /renew on your computer to re-obtain the IP.

Try to manually set the DNS.

Restart the router and check if it is connected to the correct network.

2. The Internet speed is as slow as a snail
Possible reasons:

Bandwidth is occupied: There are devices downloading or uploading madly in the background.
Wi-Fi channel interference: There are too many Wi-Fi networks around, causing signal congestion.
Internet operator speed limit: bandwidth package or FUP (Fair Usage Policy) limit.
Solution:




Check which devices are taking up a lot of bandwidth through the router management interface.
Modify the router Wi-Fi channel to avoid conflicts with surrounding networks (such as changing to channels 1, 6, and 11).
Use speedtest.net to test the speed and check whether the operator has limited the speed.

3. The Wi-Fi signal is full but the disconnection is serious
Possible reasons:

Wi-Fi device overload: Too many devices are connected, resulting in reduced stability.
Old firmware: The router firmware version is too old, affecting performance.
Physical interference: Microwaves and Bluetooth devices may affect Wi-Fi quality.
Solution:





Limit the number of devices connected at the same time, or upgrade to Wi-Fi 6 devices.
Update the router firmware to ensure optimal performance.
Avoid placing the router next to electrical appliances to reduce signal interference.
4. Can access QQ and WeChat, but cannot open web pages
Possible reasons:




DNS resolution failure: It may be a problem with the DNS server of the telecom operator.
HTTP/HTTPS blocked: Some corporate or school networks may restrict web access.
Solution:

Manually change DNS to 8.8.8.8 or 114.114.114.114.
Use the ping command to check whether the domain resolution is normal (such as ping www.baidu.com).
Try changing the network environment to eliminate LAN restrictions.





5. The switch and router are connected but the network is still abnormal
Possible reasons:

Network loop: Multiple switches are connected to each other, causing packets to circulate in the network.
VLAN setting error: The switch port VLAN setting is incorrect, resulting in data failure.
Solution:

Enable STP (Spanning Tree Protocol) to avoid loop problems.
Check the VLAN port configuration to ensure that it matches the gateway.
Use show mac address-table on the switch to troubleshoot data flow.