Cisco Updated 350-401 Exam Questions and Answers by tate

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The correct configuration for the scenario described is to use TACACS for authentication, and if TACACS is unavailable, allow login without any credentials. This is achieved by the command aaa authentication login default group tacacs+ none, which specifies TACACS as the primary authentication method and none as the secondary method, meaning no authentication is required if TACACS is not available.

References: The information is based on the Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) training

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To enable R1 and R2 to advertise routes into OSPF, the configurations must include the network command under OSPF configuration mode specifying the network to be advertised along with the appropriate wildcard mask and area ID. Additionally, the interfaces that connect R1 and R2 should be configured with the ip ospf command to include them in the OSPF process. References := The Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course covers OSPF configuration and optimization in a Service Provider network infrastructure, which includes the use of the network and ip ospf commands for route advertisement