Common Ports

Question 1

20/21

Answer 1

20/21-FTP: File Transfer Protocol (20/21 Active, 21 Passive), TCP

Question 2

22

Answer 2

22-SSH: Secure Shell, TCP
22- SFTP over SSH

Question 3

23

Answer 3

23-Telnet: Telnet, TCP

Question 4

25

Answer 4

25-SMTP: Simple Mil Transfer Protocol (Send email), TCP

Question 5

53

Answer 5

53-DNS: Domain Name System, UDP

Question 6

67/68

Answer 6

67/68-DHCP: Dynamic Host Transfer Protocol (67 Server/68 Client), UDP

Question 7

69

Answer 7

69-TFTP: Trivial File Transfer Protocol, UDP

Question 8

80

Answer 8

80-HTTP: Hyper Text Transfer Protocol, TCP

Question 9

110

Answer 9

110-POP3: Post Office Protocol 3 (Receive email), TCP

Question 10

123

Answer 10

123-NTP/SNTP: Network Time Protocol/Simple Nedtwork Time Protocol, UDP

Question 11

137/139

Answer 11

137/139-NetBIOS: NetBIOS over TCP/IP, TCP

Question 12

143

Answer 12

143-IMAP4: Internet Message Access Protocol 4 (Receive email), TCP

Question 13

161

Answer 13

161-SNMP: Simple Network Management Protocol

Question 14

443

Answer 14

443-Hypertext Transfer Protocol Secure: HTTPS, TCP

Question 15

445

Answer 15

445-SMB: Server Message Block

Question 16

1433

Answer 16

1433-SQL Server: SQL Server, TCP

Question 17

1521

Answer 17

1521-SQLnet: SQLnet, TCP

Question 18

1720

Answer 18

1720-H.323: Video Presentation Protocol, VOIP Call Setup Protocol, TCP

Question 19

2427 / 2727

Answer 19

2427/2727-MGCP: Media Gateway Control Protocol

Question 20

3306

Answer 20

3306-MySQL: MySQL, TCP

Question 21

3389

Answer 21

3389-RDP: Remote Desktop Protocol

Question 22

5004/5005

Answer 22

5004/5005-RTP: Realtime Transfer Protocol

Question 23

5060 / 5061

Answer 23

5060/5061-SIP: Session Initialization Protocol, TCP or UDP