Port numbers and tcp/udp type

Question 1

20/21

Answer 1

File Transfer Protocol (TCP)

Question 2

989/990

Answer 2

FTP over TLS/SSL (TCP)

Question 3

69

Answer 3

TFTP (TCP)

Question 4

110

Answer 4

Post Office Protocol v3 (TCP)
Remember whenever the client connects to the mail server they download all of the messages addressed to that client.

Question 5

143

Answer 5

Internet Message Access Protocol (IMAP) (TCP)
IMAP supports a wider array of remote mailbox operations which can be helpful to users.

Question 6

25

Answer 6

SMTP (TCP)
It is used to transfer mail (email) from source to destination between mail servers and it is used by end users to send email to a mail system.

Question 7

389

Answer 7

Lightweight Directory Access Protocol (TCP/UDP)
Provides a mechanism of accessing and maintaining distributed directory information. Is based on the ITU-T X.500 standard but has been simplified and altered to work over TCP/IP networks.

Question 8

636

Answer 8

Lightweight Directory Access Protocol Over TLS/SSL (TCP/UDP)

Question 9

123

Answer 9

Network Time Protocol (UDP)

Question 10

137/138/139

Answer 10

NetBIOS (TCP/UDP)
is not a protocol but is typically used in combination with IP with the NetBIOS over TCP/IP (NBT) protocol. NBT has long been the central protocol used to interconnect Microsoft Windows machines.

Question 11

53

Answer 11

DNS (TCP/UDP)

Question 12

67/68

Answer 12

DHCP (UDP)