unable to install angular cli

Question

C:\Users\anand>npm install -g @angular/cli

npm ERR! code ETIMEDOUT

npm ERR! errno ETIMEDOUT

npm ERR! network request to http://registry.npmjs.org/@angular%2fcli failed, reason: connect ETIMEDOUT 172.17.1.100:8080

npm ERR! network This is a problem related to network connectivity.

npm ERR! network In most cases you are behind a proxy or have bad network settings.

npm ERR! network

npm ERR! network If you are behind a proxy, please make sure that the

npm ERR! network 'proxy' config is set properly. See: 'npm help config'

npm ERR! A complete log of this run can be found in:

npm ERR! C:\Users\anand\AppData\Roaming\npm-cache\_logs\2018-10-08T03_20_05_026Z-debug.log