First, the network itself. The server you want to connect to the target website has insufficient bandwidth or is overloaded. The solution is simple, please change the time or change the target website. Second, the network cable problem caused the network speed to slow down. As we know, twisted-pair wires are tightly twisted together by four pairs of wires according to strict regulations to reduce the influence of crosstalk and background noise. Meanwhile, in T568A standard and T568B standard, only four wires of twisted pair 1 2 and 3,6 are used, in which 1 2 is used for transmission, 3,6 is used for reception, 1 2 must come from one winding pair, and 3,6 must come from one winding pair. In this way, crosstalk can be avoided to the maximum extent and data transmission can be guaranteed. In practice, I found that the network cable not made according to the correct standards (T586A, T586B) has great hidden dangers. The performance is as follows: in one case, the network speed is very slow when it is first used; In another case, the network speed was normal at first, but after a while, the network speed slowed down. The latter situation is very obvious on desktop computers, but it is normal to check the network speed with laptop computers. After years of practice, I found that the slow network speed caused by the network cable not made according to the correct standard is also related to the quality of the network card. Generally, the network card performance of desktop computers is not as good as that of notebook computers. Therefore, when using the switching method to troubleshoot, using a laptop to detect the normal network speed cannot rule out the problem that the network cable is not made according to the standard. We now require all network cables to be suppressed according to T586A and T586B standards, and notebook computers cannot be used instead of desktop computers for fault detection. Third, the existence of loop in the network leads to the slow speed of the network. When the number of nodes involved in the network is small and the structure is not very complicated, this phenomenon rarely occurs. However, in some complex networks, there are often redundant spare lines, which will form a loop if they are inadvertently connected. For example, the network cable is connected from the network center to the computer room 1, and then from the computer room 1 to the computer room 2. At the same time, there is a backup line directly connected to the computer room from the network center. If these lines are connected at the same time, it will form a loop, constantly sending and checking packets, thus affecting the overall network speed. This situation is hard to find. In order to avoid this situation, we are required to develop good habits when laying network cables: the network cables should be clearly marked, and records should be made where there are spare cables. When this kind of fault is suspected, the method of partition step by step is generally adopted. Fourth, the broadcast storm caused by the hardware failure of network equipment leads to the slow network speed. As the main means of discovering unknown devices, broadcasting plays a very important role in the network. However, with the increase of the number of computers in the network, the number of broadcast packets will increase dramatically. When the number of broadcast packets reaches 30%, the transmission efficiency of the network will decrease obviously. When the network card or network equipment is damaged, broadcast packets will be sent continuously, which will lead to a broadcast storm and paralyze network communication. Therefore, when the hardware of the network equipment fails, the network speed will also slow down. When this kind of fault is suspected, the hub or switch can be replaced by replacement method to eliminate the fault of hub equipment. If these devices are not faulty, after turning off the power of the hub or switch, use the "Ping" command under DOS to test the computers involved one by one, find the computers with faulty network cards, and replace them with new network cards to restore the normal network speed. Network cards, hubs and switches are the most prone to failure and slow down the network. Five, a port in the network has formed a bottleneck, resulting in slower network speed. In fact, router WAN port and LAN port, switch port, hub port and server network card may all become network bottlenecks. When the network speed is slow, we can use network management software to check the data flow of routers, switches and server ports during the peak period of network use; You can also use the Netstat command to count the data traffic of each port. On this basis, the location of network data circulation bottleneck is determined, and its bandwidth is managed to increase. There are many specific methods, such as changing the server network card to 100M or 1000M, installing multiple network cards, dividing multiple VLAN, changing the router configuration to increase bandwidth and so on. , which can effectively alleviate the network bottleneck and maximize the data transmission speed. 6. The influence of worms causes the network speed to slow down. Worms spread by e-mail have a more and more serious impact on network speed, which is extremely harmful. This virus causes infected users to keep sending emails as soon as they get online. The virus randomly selects documents from the user's personal computer and attaches them to random addresses in the user's computer address book to send emails. Hundreds of such junk mails were sent out in line, and some of them were returned in batches and piled up on the server. As a result, individual backbone Internet appears obvious congestion, and the network speed obviously slows down, which makes the local area network almost paralyzed. So be sure to upgrade the shopping time before Christmas in time. Less than 100 days. Where do you want to go crazy this Christmas? Go shopping in 10 paradise with Bian Xiao, and sweep the goods around the world to satisfy your desire to buy. 1. new york spent a day shopping for classic clothes and unique things in NoLita and SoHo districts of new york, visiting Bloomingdales department store, Saks Fifth Avenue boutique department store and Tiffany's expensive designer fashion store. You can buy fakes in Canal Street, but if you want to buy something more real, you should look at the discounted works of art in Chelsea. There are luxury shopping malls and many local handicraft shops in Dubai. Maybe buy a hookah in Alcarama, or buy some brand-name clothes in a boutique. 3. Visit Fobl's FaubourgSt-Honore and Montaigne International Haute Couture in Paris, or Galeries Lafayette and Paris Spring Department Store. PortobelloMarket in London is the best place to find antiques and second-hand goods. There are many fashion boutiques in Covent Garden Lane, Oxford Street is always crowded with people, and there are many big names like TopShop and Selfridges. If you want to do "one-stop" shopping, go straight to Harrods. 5. There are famous brand stores such as Tan, Deng and Ma Weiming in shopping malls in Hong Kong. Porcelain vases and silk garments can be bought in Liyuan East Street and Liyuan West Street, China artworks can be bought in StanleyMarket, and traditional jewelry can be bought in the jade market in Yau Ma Tei. 6. Milan's first visit to ViaMontenapoleone or ViadellaSpiga is definitely certain, there are many boutiques and discount stores there (think of designer brands such as Marni and Prada with a 50% discount). If you like antiques, go straight to the market. 7. Tokyo, a modern metropolis, is an emerging position for emerging designers. You can see their works in flea markets or boutiques. Street vendors are the best choice to buy more traditional Japanese goods. 8. Christkindelmarkt in Salzburg will open five weeks before Christmas. When you are in Dom and ResidenzSquares, you can try hot chestnuts, spiced hot wine, heart-shaped gingerbread and other foods specially prepared for Christmas. 9. Zurich Europe's largest indoor Christmas market is located at Zurich Railway Station. There are 20,640 Christmas lanterns flashing along Bahnhofstrasse, and there are more than 5,000 crystal decorations on the Christmas tree. Shopping and celebration activities start from165438+1October 25th. There are many high-end boutiques on 10.RodeaDrive and MelroseAvenue. You can buy imitations on SanteeAlley, and the outdoor shopping plaza on TheGrove offers various brands at affordable prices. If you like interesting West Coast boutiques, you can go to the pedestrian street on the third street in Santa Monica. Men's wear www.gouwuwang.net.cn/listing-30.htm