.What can ISPs use to implement inbound traffic filtering as a control to identify IP packets
transmitted from unauthorized sources? Choose the BEST answer.

A.
OSI Layer 2 switches with packet filtering enabled

B.
Virtual Private Networks

C.
Access Control Lists (ACL)

D.
Point-to-Point Tunneling Protocol

Explanation:

ISPs can use access control lists to implement inbound traffic filtering as a control to identify IP
packets transmitted from unauthorized sources.