Which command is used to enable 802.1x authorization on an interface?
A. authentication open
B. aaa authentication auth-proxy default
C. authentication control-direction both
D. aaa authentication network default group tacacs+
E. authentication port-control auto
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/dot1x.pdf
You control the port authorization state by using the authentication port-control interface configuration command (dot1x port-control auto command in Cisco IOS Release 12.2(33)SXH and earlier releases) and these keywords:•force-authorized—Disables 802.1X port-based authentication and causes the port to transition to the authorized state without any authentication exchange required. The port transmits and receives normal traffic without 802.1X-based authentication of the client. This is the default setting.•force-unauthorized—Causes the port to remain in the unauthorized state, ignoring all attempts by the client to authenticate. The switch cannot provide authentication services to the client through the interface.•auto—Enables 802.1X port-based authentication and causes the port to begin in the unauthorized state, allowing only EAPOL frames to be sent and received through the port. The authentication process begins when the link state of the port transitions from down to up or when an EAPOL-start frame is received. The switch requests the identity of the client and begins relaying authentication messages between the client and the authentication server. Each client attempting to access the network is uniquely identified by the switch by using the client’s MAC address.
still think correct answer is: authentication port-control auto
E is correct
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_8021x/configuration/xe-3se/3850/sec-user-8021x-xe-3se-3850-book/config-ieee-802x-pba.html
How to Configure IEEE 802.1X Port-Based Authentication
Enabling IEEE 802.1X Authentication and Authorization
SUMMARY STEPS
1. enable
2. configure terminal
3. aaa new-model
4. aaa authentication dot1x {default | listname} method1 [method2…]
5. dot1x system-auth-control
6. identity profile default
7. interface type slot/port
8. access-session port-control {auto | force-authorized | force-unauthorized}
9. dot1x pae [supplicant | authenticator | both]
10. end