Pay attention to the new standard "802.11AX" and "WPA3", and hold down the basics of wireless LAN trouble resolution

In order to acquire the skills to solve wireless LAN problems as quickly and reliably, it is important to first understand the basics of wireless LAN network configurations and the characteristics of the main standards.

This makes it easier to identify the location and cause of trouble.Once you have the foundation, you should remember the causes and how to deal with the common wireless LAN troubles.

Therefore, in this special feature, we first explain the basic knowledge necessary for wireless LAN troubleshooting.I will also touch on the points that can cause trouble.

From the next time, we will briefly touch on troubleshooting procedures and tools, and then take up the causes and solutions based on specific cases.

Let's take a look at the composition of a corporate network that introduced a wireless LAN.There are two basic components of wireless LAN: wireless LAN access point (AP), which is the master unit, and client, a slave unit.

The AP is wirelessly connected from the client and plays a role in bridging to a wired network.Clients include personal computers, smartphones, tablets, and various IoT (Internet of Things) devices.

The simplest wireless LAN network is composed of wireless LAN routers and clients, which is equipped with router function.This configuration is often found on small bases.Even ordinary households that have introduced wireless LAN often use this configuration.

In a network with a large scale of dozens of APs, it is common to introduce a device called a wireless LAN controller (WLC) that centrally manages AP.

Originally an appliance, but recently it has been offered as a cloud service.In addition, an authentication server to authenticate the client may be introduced.

There are various standards for wireless LAN.New standards with raised transmission speeds are created every few years, but old standards are not abolished but mixed.

The wireless LAN standard is the "IEEE 802" under the umbrella under the umbrella, an Institute of Electrical and Electronics Engineers..11 Working group (WG) is formulated.

The main wireless LAN standards created so far are listed in the following table.

The latest standard is IEEE 802.It is 11ax.The maximum transmission speed is 9.It is the fastest at 6G bit/second.

However, IEEE 802, the previous standard.The growth from 11ac is not so large.This is because it was created with a focus on improving transmission efficiency when many terminals were accommodated rather than increasing the speed per channel.

IEEE 802.The 11ax was officially approved only recently in 2021.Already a large number of IEEE 802.11AX -compatible products are on the market, which is based on the draft version.

Wi-Fi Alliance, an industry organization, is called "Wi-Fi 6" and IEEE 802.The interconnected certification test is being conducted for the draft version of 11ax.

However, even for products that have acquired the certified logo, the implementation of the new standard that has just appeared has a difference in bugs and manufacturers, and there are cases where it cannot be connected well.This is the point of trouble shooting.

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