Ports

Question 1

Port 20

Answer 1

TCP File Transfer Protocol (FTP) - Data

Question 2

Port 21

Answer 2

TCP File Transfer Protocol (FTP) - Control

Question 3

Port 22

Answer 3

TCP Secure Shell (SSH)

Question 4

Port 23

Answer 4

TCP Telnet

Question 5

Port 25

Answer 5

TCP Simple Mail Transfer Protocol (SMTP)

Question 6

Port 53

Answer 6

UDP, TCP Domain Name Service (DNS)

Question 7

Port 67

Answer 7

UDP Dynamic Host Configuration Protocol (DHCP) – Server

Question 8

Port 68

Answer 8

UDP Dynamic Host Configuration Protocol – Client

Question 9

Port 69

Answer 9

UDP Trivial File Transfer Protocol (TFTP)

Question 10

Port 80

Answer 10

TCP Hypertext Transfer Protocol (HTTP)

Question 11

Port 110

Answer 11

TCP Post Office Protocol version 3 (POP3)

Question 12

Port 143

Answer 12

TCP Internet Message Access Protocol (IMAP)

Question 13

Port 161

Answer 13

UDP Simple Network Management Protocol (SNMP)

Question 14

Port 443

Answer 14

TCP Hypertext Transfer Protocol Secure (HTTPS)

Question 15

What are Serice Names and Port Numbers

Answer 15

They are used to distinguish between different services that run over transport protocols such as TCP, UDP.

Question 16

Well known Ports/ System Ports

Answer 16

0 - 1,023; Used for protocals.

Question 17

User Ports / Registered Ports

Answer 17

1,024 - 49,151; Used for private companies.

Question 18

Dynamic and/or Private Ports

Answer 18

49,152 - 65,535; Used for local computers.

Question 19

All Operating systems must use the IANA port range’s /

Answer 19

False, Different OS in the past have used different ranges

Question 20

What Private/Dynamic Port Range do many Linux kernels use?

Answer 20

32,768 - 61,000

Question 21

What ports would be given if a computer wants to reach a server that only accepts HTTP?

Answer 21

The computer will put down its source port number being a private port number, and its destination port number being a well-known port number, HTTP would be 80.

Question 22

command in windows to see the currently open session in ports?

Answer 22

netstat -n