You want to be sure that the FTP ports that are required for a contract worker's functionality have been properly secured. Which of the following ports would you check?
a. 25/110/143
b. 20/21
c.137/138/139
d. 53
Answer: B
Ports 20 and 21 are used for FTP. Answer A is incorrect because these ports are used for email. Answer C is incorrect because these NetBIOS ports are required for certain Windows network functions such as file sharing. Answer D is incorrect because this port is used for DNS.