Basic Port List

Question 1

FTP

Answer 1

File Transfer Protocol: ports 20 and 21

Question 2

SSH

Answer 2

Secure Shell port 22

Question 3

Telnet

Answer 3

port 23

Question 4

SMTP

Answer 4

Simple Mail Transfer Protocol port 25

Question 5

DNS

Answer 5

Domain Name System port 53

Question 6

DHCP

Answer 6

Dynamic Host Configuration Protocol port 67 and 68

Question 7

TFTP

Answer 7

Trivial File Transport Protocol port 69

Question 8

HTTP

Answer 8

Hypertext Transfer Protocol port 80

Question 9

HTTPS/SSL

Answer 9

Hypertext Transfer Protocol Secure/Secure Sockets Layer port 443

Question 10

SMB

Answer 10

Server Message Block port 445

Question 11

POP3

Answer 11

Post Office Protocol version 3 port 110

Question 12

NTP

Answer 12

Network Time Protocol port 123

Question 13

IMAP4

Answer 13

Internet Message Access Protocol version 4 port 143

Question 14

SNMP

Answer 14

Simple Network Management Protocl port 161

Question 15

LDAP

Answer 15

Lightweight Director Access Protocl port 389

Question 16

IPSec and ISAKMP

Answer 16

Internet Protocol Security and Internet Security Association and Key Management Protocol both port 500

Question 17

Syslog

Answer 17

System Log port 514

Question 18

RDP

Answer 18

Remote Desktop Protocol port 3389

Question 19

Ports 0-1023

Answer 19

Well Known Ports: Ports associated with well known protocols and applications, also registered with IANA

Question 20

Port 1024-49151

Answer 20

Registered Ports, can be publicly registered with IANA for association with protocols and applications

Question 21

Prots 49142 to 65535

Answer 21

Private Ports: can be used privately without registering with IANA

Question 22

Ports 1024 to 65535

Answer 22

Source Port Ephemeral Range: Hosts create ephemeral (temporary randomly generated) numbers for source parts that are always in this range