Cisco IOS based routers perform basic traffic filtering via which of the following mechanisms?

A. datagram scanning

B. access lists

C. stateful inspection

D. state checking

E. link progressing

F. None of the choices.

Explanation:

In addition to deploying stateful firewall, you may setup basic traffic filtering on a more sophisticated router. As an example, on a Cisco IOS based router you may use ip access lists (ACL) to perform basic filtering on the network edge. Note that if they have denied too much traffic, something is obviously being too restrictive and you may want to reconfigure them.