George is the network administrator of a large Internet company on the west coast. Per corporate
policy, none of the employees in the company are allowed to use FTP or SFTP programs without
obtaining approval from the IT department. Few managers are using SFTP program on their

computers. Before talking to his boss, George wants to have some proof of their activity.
George wants to use Ethereal to monitor network traffic, but only SFTP traffic to and from his
network. What filter should George use in Ethereal?

A.
net port 22

B.
udp port 22 and host 172.16.28.1/24

C.
src port 22 and dst port 22

D.
src port 23 and dst port 23