300-410 ENARSI: Implementing Cisco Enterprise Advanced Routing and ServicesDemo

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QuestionQ10

Infrastructure Security

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Refer to the exhibit. Which action corrects the authentication problem?

  • A Configure the same password between the TACACS+ server and router.
  • B Configure the TCP port 49 to be reachable by the router.
  • C Configure the UDP port 1812 to be allowed on the TACACS+ server.
  • D Configure the user name on the TACACS+ server.
Explanation

A TACACS+ shared secret mismatch prevents the router from correctly decrypting the authentication packet, producing the invalid AUTHEN packet and incorrect expected-length error. Configuring the same password (shared key) on the TACACS+ server and router resolves the failure.

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