Which three types of traffic are allowed when the authentication port-control auto command has been issued and the client has not yet been authenticated? (Choose three.)

Which three types of traffic are allowed when the authentication port-control auto command has been issued and the client has not yet been authenticated? (Choose three.)

• EAPOL
• CDP
• STP
• TACACS+
• 802.1Q
• IPsec
  

  Answers Explanation & Hints: Until the workstation is authenticated, 802.1X access control enables only Extensible Authentication Protocol over LAN (EAPOL), Cisco Discovery Protocol (CDP), and Spanning Tree Protocol (STP) traffic through the port to which the workstation is connected. After authentication succeeds, normal traffic can pass through the port.