A customer requires that both of the default FTP ports be allowed on the firewall. Which of the
following should the technician enable to allow this communication? (Select TWO).
A.
TCP/20
B.
UDP/20
C.
TCP/21
D.
UDP/21
E.
TCP/22
F.
UDP/22
Explanation:
http://compnetworking.about.com/od/tcpip/l/blports_gl10.htm