2.1 – Compare and contrast TCP and UDP ports, protocols, and their purposes

Question 1

Which protocol uses port 22?
 ❍ A. FTP
 ❍ B. Telnet
 ❍ C. SSH
 ❍ D. HTTPS

Answer 1

C. SSH (Secure Shell) uses port 22. FTP uses port 21, Telnet uses port 23, and
HTTPS uses port 443

Question 2

Which of these would be used for streaming media?
 ❍ A. TCP
 ❍ B. RDP
 ❍ C. UDP
 ❍ D. DHCP

Answer 2

C. User Datagram Protocol (UDP) is used for streaming media. It is connectionless, whereas TCP is connection-oriented and not a good choice for streaming
media. RDP is the Remote Desktop Protocol used to make connections to other
computers. DHCP is the Dynamic Host Configuration Protocol used to assign IP
addresses to clients automatically

Question 3

Which ports are used by the IMAP protocol?
 ❍ A. 53 and 68
 ❍ B. 80 and 443
 ❍ C. 110 and 995
 ❍ D. 143 and 993

Answer 3

D. The Internet Message Access Protocol (IMAP) uses port 143 by default and
port 993 as a secure default. DNS uses port 53. DHCP uses port 68. HTTP uses
port 80. HTTPS uses port 443. POP3 uses port 110 and 995 as a secure default.
Know those ports!

Question 4

A user can receive e-mail but cannot send any. Which protocol is not configured
properly?
 ❍ A. POP3
 ❍ B. FTP
 ❍ C. SMTP
 ❍ D. SNMP

Answer 4

C. The Simple Mail Transfer Protocol (SMTP) is probably not configured properly.
It deals with sending mail. POP3 receives mail. FTP sends files to remote computers. SNMP is used to manage networks.