正解:A
What is the process for logging in?
Setting up two-factor authentication for a user for the first time:
1. A user will go to the URL given to them by OT support and enter their username and password.
2. After logging in, they'll be prompted to input their phone number and verify it with a simple phone call or text message.
3. The next step is to install Duo Mobile, a smartphone app that generates passcodes and supports Duo Push (on iPhone and Android).
4. After installing the app, it needs to be activated in order to be linked to the user's account.
5. Lastly, the user is shown a success message and the login prompt that they'll normally see when logging in.
To connect via VPN using two-factor authentication after set-up:
Go to the URL and login with their username and password.
1. Choose which authentication method: Duo Push, phone call, text or passcode.
2. If they choose Duo Push, a notification will be sent to their phone. They simply have to select the "Approve" button to redirect their browser to the SSL VPN ser-vice homepage.
3. Then they can launch "Tunnel Mode" to direct traffic through their VPN.
4. See What are the authentication choices? for more information on how each method works.