Common Ports, Protocols, Services

Question 1

TCP 20

Answer 1

FTP = File Transfer Protocol
data transfer port (command port is 21)

Other Secure alternatives to FTP:
SFTP/22 = FTP + SSH
SCP/22 - uses SSH
FTPS/990 = FTP + TLS

Question 2

TCP 21

Answer 2

FTP = File Transfer Protocol
command port (data transfer port is 20)

Other Secure alternatives to FTP:
SFTP/22 = FTP + SSH
SCP/22 - uses SSH
FTPS/990 = FTP + TLS

Question 3

TCP 22

Answer 3

SSH - Secure Shell
SCP - Secure Copy
SFTP - Secure File Transfer Protocol

Question 4

TCP 23

Answer 4

Telnet

Secure alternative: SSH

Question 5

TCP 25

Answer 5

SMTP = Simple Mail Transfer Protocol

Secure alternative (encrypted): port 465

Email ports (name/unencrypted port/encrypted port)
SMTP/25/465
POP/110/995
IMAP/143/993

Question 6

UDP 49

Answer 6

TACACS

Terminal Access Controller Access -Control System

Question 7

TCP 49

Answer 7

TACACS+

Terminal Access Controller Access -Control System

Question 8

UDP 53

Answer 8

DNS

Domain Name System

Question 9

TCP 53

Answer 9

DNS OR DNSSec

Domain Name System (Secure)

Question 10

UDP 69

Answer 10

TFTP

Trivial File Transfer Protocol

Question 11

TCP 80

Answer 11

HTTP = Hypertext Transfer Protocol

Secure alternative: HTTPS/443

Question 12

UDP/TCP 88

Answer 12

Kerberos

Question 13

TCP 110

Answer 13

POP = Post Office Protocol

Secure alternative (encrypted): port 995

Email ports (name/unencrypted port/encrypted port)
SMTP/25/465
POP/110/995
IMAP/143/993

Question 14

TCP/UDP 137 - 139

Answer 14

NetBIOS

Question 15

TCP 143

Answer 15

IMAP = Internet Message Access Protocol

Secure alternative (encrypted): port 993

Email ports (name/unencrypted port/encrypted port)
SMTP/25/465
POP/110/995
IMAP/143/993

Question 16

TCP 443

Answer 16

HTTPS

Question 17

TPC 465

Answer 17

SMTP encrypted

Email ports (name/unencrypted port/encrypted port)
SMTP/25/465
POP/110/995
IMAP/143/993

Question 18

TCP 990

Answer 18

FTPS = File Transfer Protocol Secure

FTP = TCP 20/21
Other Secure alternatives to FTP: 
SFTP/22 = FTP + SSH
SCP/22 - uses SSH
FTPS/990 = FTP + TLS

Question 19

TCP 993

Answer 19

IMAP encrypted

Email ports (name/unencrypted port/encrypted port)
SMTP/25/465
POP/110/995
IMAP/143/993

Question 20

TCP 995

Answer 20

POP encrypted

Email ports (name/unencrypted port/encrypted port)
SMTP/25/465
POP/110/995
IMAP/143/993

Question 21

UDP 123

Answer 21

NTP = Network Time Protocol
NTPSec = Network Time Protocol Secure

Question 22

TCP 3389

Answer 22

RDP = Remote Desktop Protocol

Question 23

RTP

Answer 23

RTP = Real Time Protocol

For VoIP communications, using RTP, the real time protocol, you should instead use the encrypted secure RTP protocol, SRTP

Question 24

Port Assignments

Answer 24

0-1023 = well known ports
1024-49151 = registered ports
49152-65535 = dynamic ports

Question 25

TCP/UDP 389

Answer 25

LDAP Secure Alternative: SLDAP port 636 Not to be confused with port 3389 used by RDP

Question 26

Port 636

Answer 26

SLDAP | LDAP = port 389