Common faults and treatment of LAN

Write it in front.

As a network administrator, often encounter a variety of network failures, but the elimination of network failures can not be aimless. You must set a check range before you can do more with less, which applies to any network structure. Understanding and familiar with common causes of failure is the most necessary task before doing.

Of course, I write this blog, just to expand myself, for the sake of my convenience later. As an interest and hobby!

LAN Fault Diagnosis Process

　　1. Analyze the cause of LAN fault

1.1 Network link

1.2 Configuration Files

1.3 Network Protocols

1.4 Network Services

　　2, the method of troubleshooting LAN fault

2.1 Record the symptom

2.2 Confirm user Operation correctness

2.3 Determining the problem area

2.4 Replicating LAN Failures

2.5 Checking physical connections

2.6 Checking logical connections

2.7 Checking network devices

2.8 Implementing the Exclusion scheme

2.9 Check Exclusion scenarios

　　

LAN Troubleshooting Tools

　　1. Cable Test Tool

1.1 Network cable detection instrument

1.2 Network cable Detector

　　2. Network Monitoring Tools

Network Monitor is a software-based web monitoring software that comes with Microsoft.

　　3. Network analysis Tools

3.1 Network analyzer

Novell is a network analysis tool with Microsoft.

3.2 Network analysis software NetXRay

Troubleshooting Practice for LAN

1, network equipment connection failure

1.1 NIC Setup Error

1.2 RJ-45 connector Fault

1.3 Network card or other device is damaged

1.4 Network printer is not working properly

2. Internet connection failure

2.1 ADSL Sometimes does not connect normally

2.2 ADSL Frequent drop line

2.3 ADSL cannot be connected

2.4 Sync light OK, but no internet access

2.5 ADSL dialing software is not available under Windows 8

2.6 Cell LAN mode access also often falls off the line

2.7 Parts of the computer cannot be connected to the Internet

2.8 Broadband routing does not enable Internet Connection Sharing

2.9 Intranet users cannot play online

Over 2.1 computers have high rate of substitution when surfing the internet

2.11 can share files but not share Internet access

2.12 The server cannot connect to the Internet, but other computers have access to the Internet

3, dual-machine directly connected to the issue of permissions

4, local area network speed becomes slow

4.1 Network cable problem

4.2 Loop problem

4.3 Broadcast storm

4.4 Port Bottleneck

4.5 worm virus

5. Network protocol failure

5.1 The computer cannot access the external network

5.2 IP address information is not accessible correctly

5.3 Ping through DNS but unable to surf the internet

5.4 p

Go on

Common faults and treatment of LAN