Your company network includes client computers that have Windows 7 installed. The computers are members of an Active Directory domain and receive Windows Firewall configuration through Group Policy,

A user indicates that he is unable to connect to a remote FTP server.

You need to view the status of TCP/UDP ports at the user’s computer. Which command should you run?

A.
netstat -o

B.
nbtstat -a

C.
ipconfig /all

D.
netstat -an

Explanation:
-a : Displays all active TCP connections and the TCP and UDP ports on which the computer is listening.
-n : Displays active TCP connections, however, addresses and port numbers are expressed numerically and no attempt is made to determine names.