Which of the following is the default port for TFTP?

A.
20

B.
69

C.
21

D.
68

Explanation:
TFTP makes use of UDP port 69.
Incorrect Answers:
A, C: FTP (File Transfer Protocol) uses ports 20 and 21
D: Port 68 TCP/UDP is used by Bootstrap Protocol (BOOTP) Client; as well Dynamic Host Configuration
Protocol (DHCP).
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 51
http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers