In numerous network failures, the most headache is that the network is through, but the speed is slow. In the first time, when you face this kind of "soft" failure, there are often people will be helpless. This article introduces you to the causes and elimination methods of such "soft" failure, and improve the processing power of actual problems.
★ Network line problem
We know that twisted pair is strictly tight and reasonable and closely fitted to reducing crosstalk and background noise. At the same time, only 1, 2 and 3, 6 four lines of twisted pairs are used in T568A standards and T568B standards. Among them, 1, 2 is used to transmit, 3, 6 for receiving, and 1, 2 must be from one winding, 3, 6 must be from one winding. Only in this way can you maximize crosstalk to ensure data transmission. I have found a large rigid problem in practice without the correct standard (T586A, T586B). Some started using normal start, but after a period of time, performance decreased, and the speed of the network slowed. Therefore, we now require it to press the T586A, T586B standard to press the network cable.
★ loop problem
Generally, when the number of nodes involved in the network is not a lot, this phenomenon is not very complicated, this phenomenon rarely occurs. But in some complicated networks, because some reasons often have excess alternate lines, the loop will constitute a loop, and the data package will continue to send and verify data, which affects the overall network speed, and finds more difficult. To avoid this, we must develop good habits when laying the network cable. The network cable is obviously labeled, and there is a place for the standby route.
★ Broadcast Storm
As a major means of discovering unknown equipment, broadcasting plays a very important role in the network. However, as the number of network computers increases, the number of broadcast packets will increase dramatically. When the number of broadcast packets reaches 30%, network transmission efficiency will decrease significantly. When the network card or network device is damaged, the broadcast package will be sent, resulting in broadcast storms, making network communication into paralysis. Therefore, when the network device hardware is faulty, the network speed is slow. When there is such a fault, the replacement method can be used to replace the hub or switch to exclude the network equipment failure. Then turn off the power of the hub and use the ping command to test the computer on the computer, find a computer with a faulty network card, replacing the new NIC recovery network speed.
★ port bottleneck
In fact, the wide area network port of the router and the local area network port, switch port, hub port, and server network cards may become a network bottleneck. We can use the peak hours using the network management software to view the traffic volume of the router, switches, and server ports (using the netstat command) to confirm the location of the network data circulation bottleneck, try to increase its bandwidth. If the replacement server network card is 100m or 1000m, the multiple network card is installed, and the network bottleneck can be effectively mitigated by changing the bandwidth on the router, and the network bottleneck can effectively improve the data transmission speed.
★ worm
The impact of worms to network speed is getting more serious. This virus causes the infected user to keep the outgoing mail as long as it is connected, and the virus selects a random document in the user's personal computer to be sent to the random address of the address book on the user machine. There are hundreds of this spam, and some are sent out, and some have been baked to be returned to the server. There is a significant congestion in individual backbone Internet, and individual local area networks are nearly paralyzed. Therefore, we should often pay attention to various new virus notices to understand various viral features; timely upgrade the anti-virus software used. Computers also upgrades, install system patches; simultaneously uninstall unnecessary services, turn off unnecessary ports to improve system security and reliability.
