Well Known Ports

Question 1

HTTP

Answer 1

TCP 80

Question 2

HTTPS

Answer 2

TCP 443

Question 3

TELNET

Answer 3

TCP 23

Question 4

FTP

Answer 4

TCP 20, 21

Question 5

SFTP

Answer 5

TCP 22

SSH is port 22 and FTP is using SSH for encryption which is why it’s using port 22 instead of 20 and 21

Question 6

TFTP

Answer 6

UDP 69

Question 7

SMTP

Answer 7

TCP 25

Question 8

POP3

Answer 8

TCP 110

Question 9

IMAPv4

Answer 9

TCP 143

Question 10

RDP

Answer 10

TCP 3389

Question 11

TLS/SSL

Answer 11

TCP 995/465

Question 12

RTP (VOIP)

Answer 12

UDP 5004 / TCP 5005

Question 13

MGCP (MULTIMEDIA)

Answer 13

TCP 2427 / TCP 2727

Question 14

H.323 (VIDEO)

Answer 14

TCP 1720

Question 15

SNMP

Answer 15

UDP 161

Question 16

SSH

Answer 16

TCP SSH

Question 17

NTP

Answer 17

UDP 123

Question 18

LDAP

Answer 18

TCP 389

Question 19

NETBIOS

Answer 19

TCP and UDP 137-139

Question 20

SMB

Answer 20

UDP 137
UDP 138 
TCP 137
TCP 139
TCP 445

Question 21

DNS

Answer 21

TCP and UDP 53

Question 22

DHCP

Answer 22

UDP 67 / UDP 68