Common Port Numbers

Question 1

FTP -File transport protocol

Answer 1

(TCP) 20,21

Question 2

SSH- Secure Shell

Answer 2

(TCP) 22

Question 3

SFTP- Secure file transport protocol
(Uses SSH)

Answer 3

(TCP)22

Question 4

SCP- Secure copy
(Uses SSH)

Answer 4

22

Question 5

Telnet

Answer 5

(TCP) 23

Question 6

SMTP- Simple mail transport protocol

Answer 6

(TCP) 25

Question 7

TACACS- Terminal access controller access-control system

Answer 7

(both) 49

Question 8

DNS- Dynamic host configuration protocol

Answer 8

(UDP) 67,68

Question 9

TFTP- Trivial file transport protocol

Answer 9

(UDP) 69

Question 10

HTTP- Hypertext transfer protocol

Answer 10

(both) 80

Question 11

HTTPS- Hypertext transfer protocol secure

Answer 11

(both) 443

Question 12

SSL VPN- Secure sockets layer virtual private network

Answer 12

(both) 443

Question 13

Kerberos

Answer 13

(TCP) 88

Question 14

POP3- Post office protocol version 3

Answer 14

(TCP) 110

Question 15

NNTP- Network news transfer protocol

Answer 15

(TCP) 119

Question 16

IMAP4- Internet message access protocol version 4

Answer 16

(TCP) 143

Question 17

SNMP- Simple network management protocol

Answer 17

(UDP) 161

Question 18

SNMP trap- Simple network management protocol trap

Answer 18

(TCP) 162

Question 19

LDAP- Lightweight directory access protocol

Answer 19

(TCP) 389

Question 20

ISAKMP (VPN)- Internet security association and key management protocol (virtual private network)

Answer 20

(UDP) 500

Question 21

Syslog

Answer 21

(UDP) 514

Question 22

Transmission Control Protocol

Answer 22

A network communication standard that establishes a session prior to communicating

Question 23

User Datagram Protocol

Answer 23

A network communication that does not establish a session prior to communicating