Common Network Port (Names and Numbers only)

Question 1

Telnet

Answer 1

TCP23

Question 2

SSH

Answer 2

(Secure Shell) TCP22

Question 3

DNS

Answer 3

UDP53

Question 4

SMTP

Answer 4

(Simple Mail Transfer Protocol) TCP25

Question 5

SFTP

Answer 5

(Secure File Transfer Protocol) TCP22 (uses SSH)

Question 6

FTP

Answer 6

(File Transfer Protocol) TCP20

Question 7

TFTP

Answer 7

(Trivial File Transfer Protocol) UDP69

Question 8

DHCP

Answer 8

(Dynamic Host Configuration Protocol) UDP67, UDP68

Question 9

HTTP

Answer 9

(Hypertext Transfer Protocol) TCP80

Question 10

HTTPS

Answer 10

(Hypertext Transfer Protocol (Secured)) TCP443

Question 11

SNMP

Answer 11

(Simple Network Management Protocol) UDP161

Question 12

RDP

Answer 12

(Remote Desktop Protocol) TCP3389

Question 13

NTP

Answer 13

(Network Time Protocol) UDP123

Question 14

SIP

Answer 14

(Session Initiation Protocol) TCP5060, TCP5061

Question 15

SMB

Answer 15

(Server Message Block (also called CIFS-Common Internet File System)) TCP445

Question 16

POP

Answer 16

POP3 (Post Office Protocol version 3) TCP110

Question 17

IMAP

Answer 17

IMAP4 (Internet Message Access Protocol Version 4) TCP143

Question 18

LDAP / LDAPS

Answer 18

(Lightweight Directory Access Protocol) TCP389, LDAPS (secure) TCP636

Question 19

H.323

Answer 19

(ITU telecommunication H.32x protocol series) TCP1720