Which feature can be used to accomplish this task?

A corporate policy requires PPPoE to be enabled and to maintain a connection with the ISP, even if no interesting traffic exists.

Which feature can be used to accomplish this task?
A . TCP Adjust
B . Dialer Persistent
C . PPPoE Groups
D . half-bridging
E . Peer Neighbor Route

Answer: B

Explanation:

A new interface configuration command, dialer persistent, allows a dial-on-demand routing (DDR) dialer profile connection to be brought up without being triggered by interesting traffic. When configured, the dialer persistent command starts a timer when the dialer interface starts up and starts the connection when the timer expires. If interesting traffic arrives before the timer expires, the connection is still brought up and set as persistent. The command provides a default timer interval, or you can set a custom timer interval. To configure a dialer interface as persistent, use the following commands beginning in global configuration mode:

Reference: http://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/ dia_dialer_persist.html