A network administrator is responding to a statement of direction made by senior management to
implement network protection that will inspect packets as they enter the network. Which of the
following technologies would be used?

A.
Packet sniffer

B.
Stateless firewall

C.
Packet filter

D.
Stateful firewall

Explanation:
Stateful firewall keeps track of the state of network connections (such as
TCP streams, UDP communication) traveling across it. The firewall is programmed to distinguish
legitimate packets for different types of connections. Only packets matching a known active
connection will be allowed by the firewall; others will be rejected.