BCP (Best Common Practices) 38/RFC 2827 Ingress and Egress Packet Filtering would help
mitigate what classification of attack?

A.
Denial of service attack

B.
Sniffing attack

C.
Spoofing attack

D.
Reconnaisance attack

E.
Port Scan attack

Explanation:
6. Summary
Ingress traffic filtering at the periphery of Internet connected networks will reduce the effectiveness
of source address spoofing denial of service attacks. Network service providers and administrators
have already begun implementing this type of filtering on periphery routers, and it is recommended
that all service providers do so as soon as possible. In addition to aiding the
Internet community as a whole to defeat this attack method, it can also assist service providers in
locating the source of the attack if service providers can categorically demonstrate that their
network already has ingress filtering in place on customer links.
Corporate network administrators should implement filtering to ensure their corporate networks are
not the source of such problems. Indeed, filtering could be used within an organization to ensure
users do not cause problems by improperly attaching systems to the wrong networks.
The filtering could also, in practice, block a disgruntled employee from anonymous attacks.

It is the responsibility of all network administrators to ensure they do not become the unwitting
source of an attack of this nature.