Which authentication method stores usernames and passwords in the router and is ideal for small networks?

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Question:
Which authentication method stores usernames and passwords in the router and is ideal for small networks?

server-based AAA over TACACS+
local AAA over RADIUS
server-based AAA
local AAA over TACACS+
local AAA
server-based AAA over RADIUS

Explanation: In a small network with a few network devices, AAA authentication can be implemented with the local database and with usernames and passwords stored on the network devices. Authentication using the TACACS+ or RADIUS protocol will require dedicated ACS servers although this authentication solution scales well in a large network.

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