Go back to EC0-479 - EC-Council Certified Security Analyst (ECSA)

Question :-

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?
src port 23 anddst port 23
udp port 22 and host 172.16.28.1/24
net port 22
src port 22 and dst port 22

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