Ports

Question 1

20, 21

Answer 1

FTP, unsecure file transfer

Question 2

22

Answer 2

SSH and SFTP (file transfer tunneled through SSH)

Question 3

23

Answer 3

Telnet, unsecure version of SSH

Question 4

25

Answer 4

SMTP, standard for sending email

Question 5

53

Answer 5

DNS

Question 6

67, 68

Answer 6

DHCP

Question 7

69

Answer 7

TFTP, stripped down FTP, send/receive config files, network boot

Question 8

80

Answer 8

HTTP

Question 9

110

Answer 9

POP3, receive incoming emails, store and forward to client

Question 10

123

Answer 10

NTP

Question 11

139

Answer 11

NetBIOS, file or printer sharing on a Windows environment

Question 12

143

Answer 12

IMAP, newer method of POP3, view/manipulate emails as if they were local

Question 13

161, 162

Answer 13

SNMP, collect data on managed devices

Question 14

389

Answer 14

LDAP, directory services (AD uses LDAP)

Question 15

443

Answer 15

HTTPS, uses SSL or TLS(newer)

Question 16

445

Answer 16

SMB, file and printer sharing for Windows environment, 139 to authenticate, 445 to transfer

Question 17

514

Answer 17

Syslog, sends logs back to centralized server

Question 18

587

Answer 18

SMTP TLS

Question 19

636

Answer 19

LDAPS, secure LDAP

Question 20

993

Answer 20

IMAP over SSL

Question 21

995

Answer 21

POP3 over SSL

Question 22

1433

Answer 22

SQL

Question 23

1521

Answer 23

SQLnet (oracle)

Question 24

3306

Answer 24

MySQL (open source)

Question 25

3389

Answer 25

RDP

Question 26

5060, 5061

Answer 26

SIP, initiate VoIP, Video Calls, Instant Messages