David is a security administrator working in Boston. David has been asked by the office's manager to block all POP3 traffic at the firewall because he believes employees are spending too much time reading personal email. How can David block POP3 at the firewall?

a. David can block all EHLO requests that originate from inside the office.

b. David can block port 110 to block all POP3 traffic.

c. David can block port 125 at the firewall.

d. David can stop POP3 traffic by blocking all HELO requests that originate from inside the office.

Why would you consider to send an email to an address that you know does not exist in the company you are doing an examination of penetration?

a.To determine who is the holder of the root account.

b. To examine protection against viruses.

c.To create unnecessary SPAM.

d.To cause a return response that will reveal information about mail servers and to know how they handle undeliverable mail.

e.To perform a DoS.