Do you know how to handle common computer network failures in enterprises

&Nbsp& Nbsp; During the use of switches, it is inevitable to encounter some problems, among which there are many common faults in the switching unit network. After the faults occur, they should be dealt with quickly, the cause should be identified as soon as possible, and solving the problem is the more important thing. Today, the editor has brought you some common typical fault cases and solutions, hoping to help you< Br/>
&Nbsp& Nbsp; Fault 1: The network cannot communicate when the switch is first powered on

&Nbsp& Nbsp; 【 Fault Symptoms 】

&Nbsp& Nbsp; When the switch is first turned on, it cannot connect to other networks and needs to wait for a period of time. In addition, it takes some time to access other computers quickly, and if you don't use the network for a period of time, the speed will slow down when accessing again< Br/>
&Nbsp& Nbsp; [Fault Analysis]

&Nbsp& Nbsp; Due to the fact that this switch is a managed network switch, in order to avoid the presence of topology loops in the network, which may cause network paralysis, managed switches enable the spanning tree protocol by default. In this way, even if there are loops in the network, only one path will be retained and other links will be automatically cut off. So, when the switch is powered on and started, each port needs to enter the listening, learning, and forwarding states in sequence, which takes about 3-5 minutes< Br/>
&Nbsp& Nbsp; If you need to quickly start the switch, you can start it on the port directly connected to the computer; Ldquo; PortFast& Rdquo;, Make the port immediately and permanently transition to the forwarding state, so that the device can immediately connect to the network, avoiding the necessary waiting time for the port to transition from listening and learning state to forwarding state< Br/>
&Nbsp& Nbsp; [Troubleshooting]

&Nbsp& Nbsp; If you need to quickly achieve data forwarding after the switch is powered on, you can disable the extension tree protocol or set the port to PortFast mode. However, it should be noted that although these two methods omit the port detection process, once a topology ring is formed between network devices, it will lead to network communication paralysis< Br/>
&Nbsp& Nbsp; Fault 2: A 5-port switch can only use 4 ports

&Nbsp& Nbsp; 【 Fault Symptoms 】

&Nbsp& Nbsp; There are four computers in the office, but only one information socket, so a 5-port (one of which is an UpLink port) switch is configured. I thought four computers were just connected to four interfaces, and one UpLink port was used to connect to the local area network. However, after connecting to the network, port 1 adjacent to the UpLink port cannot function properly< Br/>
&Nbsp& Nbsp; [Fault Analysis]

&Nbsp& Nbsp; The UpLink port cannot be considered as a separate port because it is actually the same port as adjacent ports, only applicable to different connection objects. With the help of the UpLink port, hub devices can be connected to the regular port of another hub device using a straight line, eliminating the need for a crossover< Br/>
&Nbsp& Nbsp; The chips for switches and hubs are typically; Times; 4. Therefore, most hub equipment ports are 4, 8, 16, 24, etc. If made into 5 ports, it will waste 3 modules and increase costs< Br/>
&Nbsp& Nbsp; [Troubleshooting]

&Nbsp& Nbsp; Replacing a 4-port switch with an 8-port switch can solve the problem< Br/>
&Nbsp& Nbsp; Fault 3:& Ldquo; COL& Rdquo; The indicator light is constantly on or flashing, making communication impossible
&Nbsp& Nbsp; 【 Fault Symptoms 】

&Nbsp& Nbsp; Computers in a local area network access servers through a hub, but one day it was discovered that all client computers were unable to connect to the server, and pings between client computers were intermittent. Checked hub and found& Ldquo; COL& Rdquo; The indicator light stays on or flashes continuously< Br/>
&Nbsp& Nbsp; [Fault Analysis]

&Nbsp& Nbsp& Amp; Ldquo; COL& Rdquo; The indicator light is used to indicate collision and conflict situations in the network& Amp; Ldquo; COL& Rdquo; The light keeps flashing, indicating a conflict has occurred; Ldquo; COL& Rdquo; If the light stays on for a long time, it indicates a large number of conflicts have occurred. The reason for the frequent occurrence of conflicts may be hub failure or network card failure. In general, the likelihood of network card failure is relatively low, so the focus is on troubleshooting the hub< Br/>
&Nbsp& Nbsp; [Troubleshooting]

&Nbsp& Nbsp; Replace the hub and restore the network to normal< Br/>




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