Network Troubleshooting thinking work

1. Cable fault (check local connection) (network card driver is not installed)
   Solution: install the driver (the driver wizard)
2. Here are local connection Option Description NIC drivers are OK, the cable is no problem.
   
3. If the sending and receiving side is 0, the first crystal fault (connection 2 received 2) The following is a normal
   
   solution: crystal head problem can replace the method used to determined a good cable pc
4. Incorrect IP address can not access, 169.254.xx occurs when no Internet access, or not in the company network address
   Solution: Static IP can be configured correctly
5. Network connectivity test procedure:
   first to ensure tcp / IP protocol ping 127.0.0.1 below normal operating
   normally below own gateway ping
   ping network address is normally below (failure)
6. DNS no problem, but no Internet access, QQ normal login.
   Solution: ping IP address ping domain names can not properly resolve how to do?
   
   Open your browser to view the proxy browser options --- ------- ××× connection (different browsers different location) remember not to use a proxy server, it may be wrong.
7. Open section of the site?
   Solution: Open the C: \ Windows \ System32 \ drivers \ etc following the hosts file can be deleted, specify the IP error
8. PC A ping through PC B PC B ping but different pc A firewall issues
   close A firewall
9. Small problem: Disable a PC online, but can access the network database
   is not set up Gateway
   cancel dns
   
   in the IE browser proxy settings wrong IP above is the Firefox browser settings
   exceptional circumstances:
   ACL settings can not access
   Vlan interface settings can not access the
   arrears no Internet access
10. Internet slow down the case:
     bad contact address if the network cable ping ttl less than 10ms normal
     broadcast storm (broadcasting network a large number of ARP)
    off when the switch on when looking for the source address of the corresponding packet capture devices (such as network printers virus): Solution
    If you find hair broadcast source addresses are public addresses, with the dichotomy pull the network cable troubleshooting
     outside the network bandwidth, slow
    ISP might have to replace the cable bandwidth operators looking to solve