Common Ports

Question 1

FTP - File Transfer Protocol

Answer 1

TCP 20 (active mode data)
TCP 21 (control)

Question 2

TFTP - Trivial File Transfer Protocol

Answer 2

UDP 69

Question 3

SFTP - Secure File Transfer Protocol

Answer 3

TCP 22

Question 4

SMTP - Simple Mail Transfer Protocol

Answer 4

TCP 25

Question 5

POP3 - Post Office Protocol

Answer 5

TCP 110

Question 6

IMAP - Internet Message Access Protocol

Answer 6

TCP 143

Question 7

Telnet - Telecommunication Network

Answer 7

TCP 23

Question 8

SSH - Secure Shell

Answer 8

TCP 22

Question 9

DNS - Domain Name Service

Answer 9

UDP 53

Question 10

DHCP - Dynamic Host Configuration Protocol

Answer 10

UDP 67 (server)
UDP 68 (client)

Question 11

HTTP - Hyper Text Transfer Protocol

Answer 11

TCP 80

Question 12

HTTPS - Hyper Text Transfer Protocol Secure

Answer 12

TCP 443

Question 13

NetBios - Network Basic Input/Output System

Answer 13

UDP 137
NetBIOS name services (nbname)

TCP 139
NetBIOS session service (nbsession)

Question 14

SNMP - Simple Network Management Protocol

Answer 14

UDP 161 (queries)
UDP 162 (traps)

Question 15

LDAP - Lightweight Directory Access Protocol

Answer 15

TCP 389

Question 16

SMB - Server Message Block
CIFS - Common Internet File System

Answer 16

TCP 445 (NetBIOS-less)

Question 17

RDP - Remote Desktop Protocol

Answer 17

TCP 3389