Cisco Certified Network Associate (CCNA) Practice Exam

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What is the first command to configure cleartext authentication for OSPF?

(config)#interface INTERFACE
(config)#ospf authentication
(config)#ip ospf authentication-key PASSWORD
(config)#ip ospf cleartext

The correct answer is: (config)#interface INTERFACE

The correct approach for configuring cleartext authentication for OSPF starts with specifying the interface. By entering the command to configure a specific interface, you set the context within which you can apply OSPF configurations, including authentication. The process involves first accessing the interface configuration mode, which is essential because the authentication settings should be applied to specific interfaces where OSPF is enabled. After selecting the appropriate interface, you can then proceed to configure OSPF and define the authentication method, including setting the authentication key. While there are commands related to OSPF authentication, they must be executed within the context of an interface. Therefore, starting with the interface configuration is critical for successfully implementing OSPF cleartext authentication.