To test the network speed of the CN2 server, you can use some network speed measuring tools to evaluate the download and upload speed of the server. Here are some commonly used methods and tools:

　　Speedtest.net: Speedtest.net is a widely used online speed testing tool. You can visit its website (https://www.speedtest.net/) and click the "Go" button to test the server's download and upload speed.

　　IPerf: iPerf is an command line tool for measuring network bandwidth. You can install an iPerf on the server, and then run the iPerf server on another computer, and bring test bandwidth by running the iPerf client on the server.

　　Install iPerf on the server:

　　Sudo Yum Install iPerf

　　Run the iPerf client on the server (replace the server_ip to the IP address of the IPERF server):

　　IPerf -c Server_ip

　　Fast.com: Fast.com is a simple network speed testing tool provided by Netflix. You can visit its website (https://fast.com/) in the browser to test the download speed.

　　NPERF: NPERF is another online speed testing tool. It provides a variety of test items such as downloading, uploading, and ping. You can visit its website (https://www.nperf.com/) in the browser.

　　Command line tool: You can also use some command line tools to test network speed, such as Wget or CURL. For example, you can use the following command to test the download speed:

　　WGET-OUTPUT-DOCUMENT =/DEV/NULL http://speedtest.tele2.net/100MB.ZIP

　　Replace URL for a available file download link.

　　Please note that the test results may be affected by various factors, including the physical location of the server, network bandwidth, network load and routes. It is recommended that you conduct multiple tests at different times and conditions to obtain more accurate network speed assessments.