Connection is abnormal, only one card has computing power

1. If the local connection of the computer is abnormal, yellow exclamation will be displayed& quot; There are no more than two cases: software and hardware. In terms of software, xp-sp2 system, routing software settings, etc., and hardware methods are network cable, network card, routing equipment, etc. The following is a summary of the online search methods: Windows XP SP2 considers more security issues. Your IP is set to be automatically obtained. In fact, it is to obtain IP and related parameters from the DHCP server. However, this process may not be completed for some reason. In the era of SP1, in this case, the operating system, in order to prevent the network from being disconnected (as Microsoft wrote), Set up a 169. X.x reserved IP for the network card without any error. If multiple computers do not get the correct IP, they can also communicate with each other through the reserved address. However, after installing SP2, the operating system does not allocate any IP, cuts off the network connection and reports the error of "limited or no local connection" according to the principle of "security first". In general, the network card can't bind IP, sometimes it can be repaired, but in many cases it doesn't work. The reason is complex. It's usually caused by the network, which has nothing to do with the system or the computer itself. Now, the troubleshooting methods are listed as follows: Method 1: open the "control panel" - network connection, and find the current local connection, Right click it, select "properties", double-click "Internet Protocol (TCP / IP)" in the "general" tab, select "use the following IP address", fill in "192.168.0.1" in "IP address", fill in "255.255.255.0" in "subnet mask", and then click "OK" to solve the problem If the current computer joins the working group or domain, it should be set according to the situation) method 2: you can remove the "notify me when there is no connection" option in the "local connection" setting of "network connection". Method 3: control panel, management tools, Set the DHCP client service in the service to automatic and then start the service. Method 4: disable the network card and then enable it. Method 5: 1. Install a network express or star speed software (it was given to you when Telecom installed ADSL or downloaded from the Internet). 2. If you don't install the dial-up software, you need to create a new dial-up connection, Just try to do it yourself. Anyway, there are not many forks... Note: in my memory, it seems that I use ADSL to surf the Internet. Before dialing, the connection is limited. At this time, the IP address should be 169..... Private address, But as long as you dial it up, it will be normal... Method 6: what's the matter with IP starting with 169? This IP is an IP address reserved by the system for itself when the windows system does not respond to the request to the DHCP server. That is to say, when your address becomes 169, it is because you did not successfully connect with the DHCP server. There are several possible reasons. The first one is that the network cable is not well connected. Although the physical connection is successful, in fact, the data can not run. The second is because the firewall blocks the communication with the DHCP server. You can check the firewall rules or turn off the firewall. The third reason may be that the MAC addresses of the network cards of the host computer are all 0. You can try to re install the NIC driver solution. The fourth reason is that if such a situation occurs in a dormitory, check whether the main line of the dormitory is connected normally. The first is the physical connection, that is, whether the light of the switch corresponding to the network cable connected to the wall port is on. The second is to check whether there is a problem with your switch. The simple way is to find a network cable and connect it directly to the computer from the wall to see if you can get on the Internet. Here is another simple way to judge whether it is a hardware problem or a software problem. Manually specify the IP address of a computer that is being used by other people in the same dormitory, If both the other party and the user indicate a conflict, it means that it is e to the software. Then check the firewall and host settings, especially whether the DHCP service is started. If the conflict is not prompted, it is the hardware reason. Check the network cable, physical connection, network card, etc. Method 7: This is mostly because the routing device does not enable DHCP, and the default setting of WinXP and other systems is to automatically obtain the IP address. In this way, when it is unable to automatically obtain the IP address, the error prompt of "local connection limited or no connection" will appear. This can happen in both wired and wireless connections. The solution is to manually set an IP address for the computer. As for what kind of IP address to set, what is the subnet mask, and how to set the gateway, please consult the network administrator. 1. Radical cure method: control panel → network connection → local connection → properties → double click & quot; TCP / IP Protocol & quot; In & quot; Use the following IP address & quot; And & quot; Use the following DSN server address & quot; Fill in your address. Generally, you can solve the problem by inputting the following contents: IP address: 192.168.1.2 subnet mask: 255.255.255.0 default gateway: 192.168.1.1 DNS server (primary): 202.102.192.68 DNS server (secondary): 202.102.199.68 2, The specific operation is as follows: control panel → network connection → local connection → properties → turn & quot; Notify me when this connection is restricted or unavailable & quot; Remove the hook in front. Method 8: first check whether the network cable from your phone line to the cat, then to the router (if there is, ha ha) and then to the computer is connected normally. The most important thing is that your crystal head is made by professionals (if there is a problem with the crystal head, it's a big trouble). If there is no problem, in the computer to unload your network card, in the device manager to re point operation, refresh, is to detect hardware changes! Let's see if your local connection is normal. If it is still an exclamation point, you can right-click the local connection property, first click TCP, IP, and then click the property. Then click to use the following IP address: input IP address: 192.168.1.100 subnet mask: 255.255.255.0 default gateway: 192.168.1.1, then click to use the following DNS server address input: 202.101.103.55, finally look at your local connection, or try to surf the Internet, if not, you replace the network card, it is very likely that your network card is the motherboard integration is broken

2. First: check all the lines to see if they are accidentally dropped, and if they are connected
Second: call the operator to see if your account is normal. If not, then decisively hand over the problem to the operator
thirdly, if you can access QQ and the web page cannot be opened, you can set the Internet Options in the browser toolbar
Fourth: set the LAN in the connection to automatic detection, and set the wireless network attribute to automatic acquisition.

3. This is poisoned, the next free anti-virus software, such as 360 anti-virus, Jinshan drug bully, little red umbrella and so on, try in the safe mode of anti-virus, OK!

4. You have deleted the system files. Try to re install the NIC driver. I also encountered this problem a few days ago. Would you like to try the system restore

5. The low speed of mobile phone using WLAN is related to many factors:
1
2. Restart the mobile phone and the router and try to connect the wireless network again to check if there is a problem with the router
3. Try to connect to another WiFi environment.

6. If the computer broadband connection shows a red cross, you can solve the problem according to the following conditions:
1. Router problem:
(1) check whether the router light is normal. If it is a light cat, other lights are on except the Los light. You can turn off the router and cat power, and then turn it on again after 5 minutes
(2) if the light cat lamp is abnormal, you can check whether there is a problem with the light cat optical interface, whether the indoor tail fiber connection light cat connector is loose, and plug in the connector to recover; The bending of some indoor optical fibers is too large. Over bending of optical fiber will affect the total reflection transmission of optical signal in optical fiber, as long as the optical fiber is straight; If some outdoor optical fibers are broken or the optical port of the equipment in the computer room is faulty, it is necessary to contact the staff for troubleshooting
2. Computer system configuration:
(1) reset the network: press Win + r on the desktop, enter CMD, click OK to open the command prompt window, press Win + X on win10 to open the command prompt directly, and enter: Netsh Winsock reset in the command prompt. Later, there will be a successful prompt: reset the Winsock directory successfully / restart the computer to complete the reset
(2) IP address and DNS identification problem: open the computer "control panel", click "network connection", select local connection, right-click the local connection icon, select "properties", double-click "Internet Protocol (TCP / IP)" in the "general" tab, select "use the following IP address", and fill in "192.168.0.1" in the IP address, Fill in 255.255.255.0 in the subnet mask, otherwise, click OK. It should be noted that IP must be in the same network segment as modem IP address. If it is a wireless network, you can click the network icon on the desktop taskbar, open the network and sharing center, click local connection, click properties, double-click IPv4, and set the IP address and DNS to automatic acquisition. If you still can't get online after self-help troubleshooting, you can contact the customer service of your home place to report the problem.

7. When using ADSL to access the Internet, we often encounter the phenomenon that the web page cannot be opened, the download is interrupted, or the online video and audio stream is interrupted, QQ is dropped, and the game is dropped. It may be assumed that ADSL is used to access the Internet. In fact, the reasons why other ways of Internet access are often offline are roughly the same as the following reasons. Now let's analyze the reasons for ADSL offline
first, the line problem
first, check the line at home to see if the connector in the house is connected properly, and whether the line passes through any interference source, such as air conditioner, refrigerator, TV, etc., and try to keep a certain distance from these electrical equipment. It can also replace the indoor lines with more anti-interference network cables. Make sure the wiring is connected correctly. After entering the home, the telephone line is connected to the junction box, and then separated to the voice separator, one line goes to the telephone, one line goes to the modem (the separator is marked). At the same time, ensure that the communication quality of the line is good without interference, and no other equipment that will cause line interference is connected. And check whether the junction box and crystal head have poor contact and whether they are wound in series with other wires. If possible, it's better to use standard telephone line and connect PC with twisted pair attached to ADSL modem. Line is one of the important factors for the quality of image access to the Internet. Signal interference sources such as radio transmitting tower, electric welding machine, tramcar or high-voltage power transformer within 100 meters from the user's cable can make the user offline receive clutter (copper clad steel wire has weak shielding and strong signal receiving ability), causing strong interference to the user's line. The interfered signal is usually the unshielded offline part, because the relay cable has a shielding layer, so the interference and influence are very small. If you use some shielded downlines in places with large interference, it will rece the speed instability or disconnection caused by interference. In addition, the power line should not be paralleled with the ADSL line, in order to avoid crosstalk, resulting in ADSL failure. In addition, there are many other factors that cause network instability, such as signal interference, software conflict. The mobile phone, which has a large radiation, must not be placed next to the ADSL modem, because the mobile phone will automatically find the network every few minutes. At this time, the strong electromagnetic interference is enough to cause the ADSL modem to cut off the current
Second, the network card problem
the network card is usually PCI network card or on-board network card. When you choose, you must choose the one with better quality, otherwise the quality of Internet access may be poor. 10m or 10m / 100M adaptive network card can be used. In addition, many machines share the Internet and use al network cards, which also causes conflicts, which is also worthy of attention. At this time, you should pull up the network card connecting to the LAN or other computers, and only use the network card connecting to ADSL to test the Internet. If the fault returns to normal, check whether there is any conflict between the two network cards
Third, ADSL modem or network card setting problem
now modem generally has two working modes, one is the normal mode of using dialing software, the other is the routing mode of automatic dialing. In normal mode, you don't need to set modem, just use the default mode. The routing mode needs to be set. Modem has its own flash memory, which can save the account and password box settings for automatic dialing. The most common method is to set the IP address of ADSL modem or DNS server incorrectly. Because for ADSL virtual dial-up users, there is no need to set the IP address, which can be automatically assigned. TCP / IP gateway generally does not need to be set. But set DNS must be set correctly, DNS address can be obtained from the local telecommunications department. In addition, TCP / IP settings are most likely to cause the situation of not being able to browse web pages. Generally, it is set to automatically obtain the IP address, but DNS must be filled in. Other default can be used
Fourth, ADSL modem synchronization abnormal problem
check whether your phone line and the ADSL connection are in poor contact, or there is a problem with the phone line, the poor quality of the phone is particularly prone to drop, but this problem is not easy to check, so be sure to use a good quality phone line. If it is suspected that the separator is broken or the ADSL modem is broken, try to directly connect the external line to the ADSL modem without using the separator. The connection between the separator and ADSL modem should not be too long, otherwise it cannot be synchronized. To eliminate the above situation, as long as the ADSL modem is restarted, the synchronization problem can be solved
fifth, operating system, virus problems
in addition to the above-mentioned line conditions, there are also computer system problems. For example, the legendary killer caused the LAN to drop. This problem occurs in a large area all over the country. The virus will affect the Internet cafes (LAN) of host agent and router agent. Legend killer is a destructive software that can cheat LAN by ARP and create virtual gateway address to collect login information of Legend game in LAN and analyze it to get user information. Workflow: first of all, broadcast local Mac to LAN by ARP Cheating, so that the workstation in LAN mistakenly thinks this machine is gateway. This process will cause the connection between LAN and Internet to be interrupted, When the user restarts the game and logs in the account, the account information will not be uploaded to the proxy server directly through the gateway, but will be uploaded to the legendary killer software which is carrying out ARP deception, Attack situation: LAN and Internet link speed suddenly slows down or even breaks down. Online games break off the link, and after logging in again, the server will be prompted that there is no corresponding response. It is suggested to check and kill the virus first; If you have the ability, re install the system; If the machine has two network cards, unload one network card; It is suggested that users who are not familiar with computers should not install all kinds of firewall software at will. Incorrect settings will cause unstable Internet access. Some operating systems may have compatibility problems with ADSL related components, so you can go to Microsoft to upgrade the system or repair the system. If possible, it can be reassembled. If there is a conflict in the software, try to find out the conflict software, uninstall it or solve it by other methods< (6) the firewall and IE browser are not set properly.
although ADSL is less likely to be attacked by hackers and viruses, it does not rule out the possibility, especially web viruses and worms. If the virus destroys ADSL related components, there will also be a disconnection phenomenon. If it can be determined that it has been damaged and attacked by the virus, and there is a disconnection phenomenon, it is necessary to check the installed firewall, proxy server software for sharing the Internet, Internet acceleration software, etc. after stopping running such software, it is necessary to test the Internet to see if the speed returns to normal. If the Internet is not stable, you can try to turn off the firewall first, test whether it is stable or not, and then set it accordingly. In addition, firewall or IE browser failure can also lead to normal connection, but can not open the web page< Seven, static problem
static is an important factor affecting ADSL, and the power supply in the home is generally not grounded, coupled with the interference of various electrical appliances (such as refrigerators, TVS), it is easy to cause static interference, resulting in frequent disconnection of ADSL in use, please lead the grounding terminal of the three core socket out of the wire and make a good grounding, which can generally solve the problem of disconnection. General solution: add grounding wire to solve the problem of disconnection< Eight, software conflict problem
there are two ways for ADSL to access the Internet: virtual dial-up and private line access. Now most of the ADSL of indivial users are virtual dial-up. PPPoE (point-to-point protocol over Ethernet) virtual dialing software has its own advantages and disadvantages. After many tests on different operating systems, if the operating system is Windows XP, it is recommended to use its own PPPoE dialing software, which has less current interruption and relatively improved stability. If you are using Windows me or 9x, you can use the following virtual dialing software -- enternet, winpoe, raspppoe. Among them, enternet is now more commonly used, and enternet 300 is suitable for Windows 9x; Enternet 500 is suitable for Windows 2000 / XP. When you have problems with one PPPoE dialing software, you may as well uninstall the software and use another PPPoE dialing software. Please be careful not to install multiple PPPoE software at the same time to avoid conflicts. Because the telephone line is the main way of broadband access, so we must set up a virtual channel. If several kinds of dial-up software are mixed, it will cause conflicts, resulting in network instability. If there is a conflict in the software, try to find out the conflict software, uninstall it or solve it by other methods. For example, some friends BT download will lead to network offline. It may take too many threads to download, resulting in disconnection
in addition, besides the above reasons of their own computers, the reasons for QQ and game offline may also be related to their own server restrictions and server attacks or failures.

8. As I said, it's really hard for me to slow down, too.

first look at the "system resources" of the computer, right-click "my computer", select "properties", and then select "performance" to see how many "system resources" are, Generally, it should be about 95%
1. The less things on my desktop, the better. There are only "my computer" and "Recycle Bin" on my desktop. More and more things take up system resources. Although it's more convenient on the top of the desktop, it's at the cost of occupying system resources and sacrificing speed. The solution is to delete all the shortcuts on the desktop, because they are in the start menu and the program bar. Move other files that are not shortcuts to disk D or disk e instead of disk C. C disk only put Windows files and some program installation must be installed in C disk, others are not put in C disk, put in D disk or e disk
2. Right click "my computer", select "properties", then select "performance", and click "file system" on the left. There is a "main purpose of this computer (T)" option. Drop down the arrow, change "desktop" to "network server", and then confirm. Then select the "virtual memory" on the right, select "user specified virtual memory settings (m)", and then change the maximum and minimum values to the value of your computer's memory multiplied by 2, for example, 128 megabytes of memory, then set it to "256", and then confirm, regardless of the display prompt, confirm that you need to restart later
3. Open "my computer", open C disk, there is a Windows folder, open it, find a "temp folder", delete all the files in it (need to close other applications in advance). Next to "temp folder", there is a "temporary Internet Files folder". Open it and delete all the contents. It must be noted that the "temp folder" and "temporary Internet Files folder" should not be deleted. They are deleting everything in the folder. Remember!!! This operation is best carried out once a month
4. Just leave the real-time monitoring icon of anti-virus software and the leftmost "start" on the bottom line of the computer screen, and delete all the others, because it takes up system resources and many things are not used at all. It's all available in the start menu. You can add the most commonly used software shortcut in the start menu, and the second commonly used one in the program menu
5. Set the desktop wallpaper and screen saver to none.
6. Select start, programs, accessories, system tools, maintenance wizard in the lower left corner, modify my maintenance settings or schele, and then select custom, next, custom, and next, A dialog box "start windows more quickly" will appear, and all the checkmarks in it will be cancelled. This is the program started at boot time, some of which are not used at all. If you use it, it will be very fast to restart. Next, choose no, next, no, next, no, finish. OK
7. Select "start" -- "programs" -- "accessories" -- "system tools" -- "ScanDisk program" in the lower left corner, select "auto repair errors" above, and then "start". The repair will be completed soon. Repair all your hard disks C, D, e and F, and then "close" to exit
8. Select "start" -- "programs" -- "accessories" -- "system tools" -- "disk defragmenter" in the lower left corner, select "all hard disks" in the drop-down menu and confirm. Then you can wait and have a rest, ha ha. If you have never run this program before, and your hard disk is very large, it may take more than an hour (if you think the time is long, you can stop and run it several times later). This program should run about once a month later, and the running time will be much shorter after the second time
after such maintenance, has your computer recovered the speed it was when you first bought it? Even faster, ha ha! Then right click "my computer", select "properties", and then select "performance" to see how many "system resources" are. Has 95% been achieved?

9. This phenomenon is caused by three reasons: first, the responsibility of the operator (transmission and switching network failure): the operator must ensure that the signal quality (bandwidth, bit error rate, signal to clutter ratio, transmission rate, signal level, input and output impedance, signal stability, input and output impedance stability) to the user meet the national standards; Specific telephone: Telecom 10000 Netcom 10060 Tietong 10050 2: website problems: 1: website server is unstable; 2: The software of the website is unstable; 3: The quality of website operation and maintenance is low; Can not timely troubleshooting; For example: it's good to go to other websites, but one website is especially bad. This is the problem of the website itself, which has nothing to do with the operators and users. Copyright statement: the answer is harmonious original, no one can embezzle! Three: users (responsibilities) the following factors will lead to your current status. If the above operators have no problems, the next is your own problems; If you don't have the following problems, you can call the operator directly and ask the operator to tell you about the relevant matters of the operator. Copyright statement: the answer is harmonious original, no one can embezzle! Check whether the power supply is stable with a multimeter? 1.2 is the AC voltage fluctuation within the allowable range? Does it exceed 5% of rated voltage? Is the ripple coefficient of 1.3a/d power supply (checked by millivoltmeter) qualified? 1.4 is the temperature rise of the power supply abnormal? 1.5 whether the voltage stabilizing characteristics meet the technical specifications? 1.6 under 1.5 rated load, whether the voltage stabilizing characteristics and ripple coefficient meet the technical specifications? 1.7 when replacing a large fan, does your power capacity meet the requirements? 1.8 the power supply of general auxiliary equipment (router, network switch, cat, etc.) is rectifier power supply, which has no voltage stabilizing function. The ripple coefficient is large (which may be caused by dry filter capacitor), and the load capacity is poor; If the equipment cannot work e to heating, special attention should be paid to the monitoring ring operation. 1.9 e to the over-voltage of the equipment (like feeding a child, too much can last), low voltage (like feeding a child, too little will lead to malnutrition), large voltage fluctuation (like feeding a child, too much to eat, too much to eat), over-current and heating, the overheating protection action will be switched out of fault and the equipment will be out of operation (that is, slow, delayed Repeat start, delay, drop line, interrupt, break line, automatic shutdown, crash, etc; 1.10 whether the over-current protection and over heat protection of power supply operate correctly? Is the movement sensitive? Do you refuse to operate or misoperate? Copyright statement: the answer is harmonious original, no one can embezzle! ★ 2: check the network cable and crystal head (R45): 2.1 whether the crystal head and seat are inserted (loose)? 2.2 is the contact good? What is the contact resistance? 2.3 is there any ash deposit? Is it oxidized? 2.4 is the mechanical locking between crystal head and base locked? 2.5 is the locking firm? 2.6 is the network cable tightly pressed and in good contact with the crystal head? 2.7 the line to line insulation resistance of network lines (using a 100V megger) shall be greater than 20 megohm. Copyright statement: the answer is harmonious original, no one can embezzle! 3: lightning protection, grounding: grounding is mainly to protect the safety of people and equipment! Lightning will burn the network card; When serious, it can cause fire and casualties! Multi point grounding, repeated grounding and nearby grounding are the principles; Grounding is divided into protective grounding, shielding grounding and working grounding; Static electricity is the main cause of blue screen crash! I use a noise meter to test that the noise voltage is more than 6000 times of the signal when it is not grounded. If you are not grounded, can your equipment work with such a high noise? Grounding is the most basic requirement for it, especially for analog devices and digital circuits. Interference from all aspects can be eliminated or eliminated through grounding. External interference and coupling between local and local wiring can be eliminated and eliminated. Equipment grounding and shielding work should be done well. Many interference comes from poor shielding and poor grounding, Many people only work on the software, and many interferences are caused by poor grounding or no grounding. This kind of fault is very easy to occur and easily ignored by many people. Many equipment damage is directly related to grounding. No grounding or poor grounding will lead to inter symbol interference, bit error, delay, packet loss, interruption, disconnection (disconnection, interruption), crash, card Automatic shutdown, repeated startup, repeated startup, frequent restart (or repeated connection) and other phenomena. There must be more than two grounding electrodes for grounding, and the interval between each grounding electrode shall be at least 10 meters. The grounding wire from the grounding electrode to the machine room shall not have any joint. Soft copper wire with a cross section of not less than 25 square mm shall be introced into the bus bar of the machine room (no joint is allowed in the middle), and the grounding wire shall be symmetrically connected with the Faraday network to facilitate the diversion of current, The connection point with the bus bar shall be coated with silver powder conctive paste, the cross section of the grounding wire from each equipment to the bus bar (independent) shall not be less than 4 square meters of multi strand soft copper wire, and the grounding resistance of the bus bar to each grounding electrode shall be less than 5 ohm (the smaller the better). At least twice a year, the grounding instrument (more than 2.5 level grounding instrument measurement, and the instrument is within the inspection period) shall be used for inspection. When checking the grounding electrode, it is strictly forbidden to do it in thunderstorm weather. It is strictly forbidden to use the n-zero line of water pipe and power line as grounding; That is, independent grounding device. The line of each equipment shall be connected to the bus bar of the machine room independently. It is strictly forbidden to connect the bus bar in series. I can say subjectively: whether you are an indivial user or a collective user of a large computer room, you are not grounded at all. Copyright statement: the answer is harmonious original, no one can embezzle! 4: Bandwidth: the bandwidth from operators to users is very important. Without enough bandwidth, enough data traffic cannot be guaranteed; It is impossible for computers to get on the Internet smoothly; The bandwidth mentioned above refers to the bandwidth of the whole process. Like on the expressway, there is such a wide bandwidth that there can be no fluctuation in the whole process; A little fluctuation in the whole process will affect the network speed; The user has the right to ask the operator (test with sweeper) for protection; 5: Signal to noise ratio (signal to noise ratio, which can be understood as signal purity) is small, the useful signal is covered by the noisy spurious signal (especially the inter symbol interference), so that the way to receive the signal can not correctly extract the useful signal from the noisy signal, and the judgment circuit can not correctly judge the code element, which will lead to error code Serious bit error is packet loss, serious packet loss is the cause of delay, and serious delay is line dropping (slow, delay, repeated start, line dropping, delay, line dropping, interruption, line breaking, automatic shutdown, crash, etc.). Use a noise meter or level meter to measure whether the noise level is within the allowable range, Or use oscilloscope to observe whether there is stray signal? Is there inter symbol interference? Take measures to eliminate it. The signal to clutter ratio should be more than 60dB. Test (observe) with sweep frequency instrument and oscilloscope. This indicator is to ensure that the road is smooth and barrier free. There is such a wide road, but also the whole process barrier free. Copyright statement: the answer is harmonious original, no one can embezzle! 6: matching: matching includes level matching and impedance matching (test with level meter and signal generator). 6.1 level matching: the received signal should not be too low. When it is too low, it can not reach the threshold level required by the receiving Road, and the equipment can not work normally; If the level is too high, the front-end circuit will be saturated or burned out. If the receiving level fluctuates near the receiving threshold, the computer will restart frequently; Therefore, receiving level adjustment is very important. Use level meter or oscilloscope frequently in operation to monitor and adjust the receiving level at the connection within the appropriate range. According to the instruction, monitor the adjustment with a level meter. 6.2: impedance matching: the connection point must match the impedance relatively. If the input and output impedance do not match, it will lead to reflection attenuation, and no matter how strong the signal is, it will not work normally. Copyright statement: the answer is harmonious original, no one can embezzle! 7: optimize the network structure, people will generate garbage when they turn on the computer to access the Internet, just like eating, if they don't clean the table, wash the dishes, and clean the stove, they will generate computer garbage, and the computer will graally show slow, card, delay, repeated startup, offline and other faults; Therefore, I recommend using some small tools: such as super rabbit, optimization master, Lu master or 360, etc; Develop a good habit of cleaning up rubbish before going offline. 7.1: timely removal of garbage fragments and ie cache generated by the Internet: as long as you use the computer, garbage will be generated. If you don't clean it in time, it will accumulate more and more. If you don't clean it for a long time, it will make the running space of C disk smaller and smaller and disorderly. Finally, it will slow down graally until it crashes; Therefore, regular sorting and running C disk can keep the computer running speed
7.2: synchronize the ADSL device first: power off the device and restart it. Copyright statement: the answer is harmonious original, no one can embezzle! 8: software setting and configuration 8.1: Download common software from large official websites as far as possible. Do not install 3, informal software, P2P (resource occupying) software, and uncommon software. Turn off all unnecessary network connections and startup items, such as Thunderbolt, BT, donkey, etc; Do not put the non running software in the running C disk; Update patches in real time. Game software should be downloaded from regular large websites. Pay attention to whether the software is stable. Immature and unstable software will lead to slow, card, crash and other failures, especially some popular game software. Some netizens have a strong response to this. Such software should be paid special attention to or deleted immediately; When downloading software, we should pay attention to the rogue software inserted into the critical computer security, at any time to clear. Many acceleration software are mostly with viruses or ad plug-ins, which occupy your disk resources. Some game software started, the game will be directly t off, after the unlimited drop, restart and other failures. Protocol: the protocol in the network should also match it, and mismatching will also cause some equipment failures. Software conflicts will also cause delay, card, slow, crash, offline, interruption and other issues. 8.2: antivirus software and firewall at least one valid genuine antivirus software, and often upgrade the virus library: proper firewall settings (not too much, too high, too low), will cause some web pages can not be opened; Virus can make the computer slow down, crash, drop line, card, repeat start and switch failure. Copyright statement: the answer is harmonious original, no one can embezzle! 9: temperature, humidity and temperature rise with the extension of startup time, the temperature of the main equipment and its auxiliary equipment (cat, router, network switch, etc.) will graally rise. If it can not be sent out quickly, it will be delayed slow dropped dead. 9.1: humidity: in rainy season or rainy days and areas with high humidity, the insulation between lines and devices is reced, and the signal level drops, resulting in inter symbol interference, bit error, delay, packet loss, interruption, disconnection (short line or interruption), crash, automatic shutdown, repeated startup (restart)