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What can ISPs use to implement inbound traffic filtering as a control to identify IP packets transmitted from

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

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.


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