Refer to the exhibit. A network administrator configures AAA authentication on R1. Which statement describes the effect of the keyword single-connection in the configuration?

Refer to the exhibit. A network administrator configures AAA authentication on R1. Which statement describes the effect of the keyword single-connection in the configuration?

• R1 will open a separate connection to the TACACS+ server for each user authentication session.
• The authentication performance is enhanced by keeping the connection to the TACACS+ server open.
• The TACACS+ server only accepts one successful try for a user to authenticate with it.
• R1 will open a separate connection to the TACACS server on a per source IP address basis for each authentication session.
  

  Answers Explanation & Hints: The single-connection keyword enhances TCP performance with TACACS+ by maintaining a single TCP connection for the life of the session. Without the single-connection keyword, a TCP connection is opened and closed per session.