Ports

Question 1

20

Answer 1

File Transfer Protocol (FTP) Data Transfer / connection

Question 2

21

Answer 2

File Transfer Protocol (FTP) Command Control / session control

Question 3

22

Answer 3

Secure Shell (SSH) / Secure Copy (SCP)

Question 4

23

Answer 4

Telnet - Remote login service, unencrypted text messages

Question 5

25

Answer 5

Simple Mail Transfer Protocol (SMTP) E-mail Routing - sending

Question 6

49

Answer 6

TACACS+ Terminal Access Controller Access Control System

Question 7

50 / 51

Answer 7

IPsec Encapsulating Security Payload (ESP)
/
IPsec Authentication Header (AH)

Question 8

53

Answer 8

Domain Name System (DNS) service - UDP queries and replies | TCP zone transfers

Question 9

67 / 68

Answer 9

Dynamic Host Configuration Protocol (DHCP) - a network protocol that automatically assigns IP addresses and other communication parameters to devices on a network

Question 10

69

Answer 10

UDP: Trivial File Transfer Protocol (TFTP)

TFTP is not secure because it uses UDP for transport. It doesn’t have provisions for user authentication, and it’s not possible to list, delete, or rename files or directories.

Question 11

80 / 8080

Answer 11

Hypertext Transfer Protocol (HTTP) used in World Wide Web

Question 12

88

Answer 12

Kerberos

Question 13

110

Answer 13

Post Office Protocol (POP3) used by e-mail clients to retrieve e-mail from a server

Question 14

111

Answer 14

Portmapper (Linux)

Question 15

119

Answer 15

Network News Transfer Protocol (NNTP)

Question 16

123

Answer 16

Network Time Protocol (NTP) - UDP synchronizing device clocks

Question 17

137 / 138 / 139

Answer 17

TCP & UDP NetBIOS

Question 18

143

Answer 18

Internet Message Access Protocol (IMAP) Management of Digital Mail - receive

Question 19

161 / 162

Answer 19

Simple Network Management Protocol (SNMP)
/
UDP: SNMP notifications. traps (error messages and notifications)

Question 20

194

Answer 20

Internet Relay Chat (IRC)

Question 21

389 / 636

Answer 21

Lightweight Directory Access Protocol (LDAP) - LDAPS -> 636

Question 22

443

Answer 22

HTTP Secure (HTTPS) HTTP over TLS/SSL / VPN

Question 23

445

Answer 23

Server Message Block (SMB) - TCP

Question 24

465 / 587

Answer 24

SMTPS w/ SSL - TLS -> 587

Question 25

500

Answer 25

Internet Key Exchange (IKE) / ISAKMP

Question 26

514

Answer 26

SYSLOG

Question 27

989 / 990

Answer 27

TLS/SSL

Question 28

1433 / 1434

Answer 28

MS SQL Server

Question 29

1521

Answer 29

Oracle DB

Question 30

1701

Answer 30

Layer 2 Forwarding Protocol (L2F)

Question 31

1723

Answer 31

Point-to-Point Tunneling Protocol (PPTP)

Question 32

1812 / 1813

Answer 32

RADIUS

Question 33

3306

Answer 33

MySQL

Question 34

3389

Answer 34

Remote Desktop Protocol (RDP)

Question 35

5060 / 5061

Answer 35

Session Initiation Protocol (SIP)

Question 36

9100

Answer 36

HP JetDirect - Very popular printer port