350-401 Question #601: Real Exam Question with Answer & Explanation

Question

An administrator must enable Telnet access to Router X using the router username and password database for authentication. Which configuration should be applied?

Options

• ARouterX(config)# line aux 0
• BRouterX(config)# aaa new-model
• CRouterX(config)# line vty 0 4
• DRouterX(config)# line vty 0 4

Explanation

To enable Telnet access and configure local authentication on a Cisco router, the virtual terminal (VTY) lines must be configured.

Common mistakes.

• A. line aux 0 configures the auxiliary port, which is used for out-of-band management via a modem or console, not for standard Telnet access.
• B. aaa new-model enables the AAA (Authentication, Authorization, and Accounting) subsystem, which is a prerequisite for more advanced authentication schemes but is not the specific command to enable Telnet access or configure VTY lines.
• C. This option is identical to choice D, indicating it refers to the same correct command for configuring virtual terminal lines for Telnet access.

Concept tested. Cisco IOS VTY line configuration for Telnet

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_authen/configuration/xe-3s/sec-usr-authen-xe-3s-book/sec-cfg-vty.html

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