Cisco Certified Network Associate (CCNA) Practice Exam

What must be set to allow telnet access to a router?

1. console password

2. enable password

3. telnet password

4. vty password

The correct answer is: vty password

To allow Telnet access to a router, a virtual terminal line (vty) password must be configured. This is necessary because Telnet operates over the vty lines, which are used for remote access to the router. When you set a vty password, you essentially define the authentication method for any incoming Telnet connections. This means that when a user attempts to connect to the router via Telnet, they will be prompted to enter the configured password before gaining access to the router's command line interface. The vty lines are specifically designed for remote access and can have different passwords that separate them from the console and enable passwords, which are used for physical access to the device and entering privileged EXEC mode, respectively. Therefore, ensuring that a vty password is set is crucial for securing remote access via Telnet.