If you live in a house on the outskirts of a city, subscribe to a fast and comfortable fiber-optic line.Various companies, such as NTT affiliates, CATV (cable television) affiliates, and independent companies, offer fiber-optic lines and ISP (Internet Service Provider) contracts as a set.A device called ONU that converts light to Ethernet and a NAT router with Wi-Fi are installed indoors and used.Optical lines on remote islands are also expanding due to national policies.Here's an easy way to find out what's wrong.Please access "Fast.com" (https://fast.com/ja/) that measures the line speed provided by NetFlix.You can use it from your browser on your computer, tablet, or smartphone.If you measure the connection speed with Fast.com, it will be easier to judge whether it is normal or not.If the Wi-Fi connection is broken, the browser will say "You are not connected to the Internet" and you will not be able to access Fast.com.Tadashi Sugita Internet handle is sugipooh amateur radio, TK-80BS, PC-8001, APPLEII, Apple follower from MacintoshPlus.From large-scale storage, RAID and NAS development to Web server development and data center security standard ISO27001 (ISMS) acquisition for the first time in Japan.He is currently engaged in research and development of energy-saving data centers for hosting and consulting for construction of energy-saving data centers.