350-401 Question #550: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. A network engineer attempts to connect to the Router1 console port. Which configuration is needed to allow Telnet connections?

Options

• ARouter1(config)# line vty 0 15
• BRouter1(config)# telnet client
• CRouter1(config)# line console 0
• DRouter1(config)# access-list 100 permit tcp any any eq telnet

Explanation

To enable remote Telnet connections to a Cisco router, the Virtual Terminal (VTY) lines must be configured, as these lines handle network-based management access.

Common mistakes.

• B. The telnet client command is used to initiate a Telnet connection from the router to another network device, not to enable incoming Telnet connections to the router.
• C. The line console 0 command configures the direct, physical console port, which is used for local serial access and not for remote network-based Telnet connections.
• D. An Access Control List (ACL) entry like access-list 100 permit tcp any any eq telnet controls which Telnet traffic is allowed or denied, but it does not enable the Telnet service itself on the router; the VTY lines must first be configured to accept Telnet connections.

Concept tested. Cisco VTY line configuration for Telnet

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_user_auth/configuration/15-mt/sec-user-auth-15-mt-book/sec-cfg-vty.html

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