You can set up captive portal authentication on your switch to redirect all Web browser requests to a

login page that requires users to input a username and password before they are allowed access.

Upon successful authentication, users are allowed access to the network and redirected to the

original page requested. Junos OS provides a customizable template for the captive portal window

that allows you to easily design and modify the look of the captive portal login page. You can modify

the design elements of the template to change the look of your captive portal login page and to add

instructions or information to the page. You can also modify any of the design elements of a captive

portal login page. The first screen displayed before the captive login page requires the user to read

the terms and conditions of use. By clicking the Agree button, the user can access the captive portal

login page. https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topicmap/user-authentication-captive-portal.html