Common Ports Part 1

Question 1

What Telnet stands for and what port it uses?

Answer 1

Telnet stands for Telecommunication Network and uses TCP 23

Question 2

What SSH stands for and what port it uses?

Answer 2

SSH stands for Secure Shell and uses TCP 22

Question 3

What DNS stands for and what port it uses?

Answer 3

DNS stands for Domain Name System and uses UDP 53 port

Question 4

What SMTP stands for and what port it uses?

Answer 4

SMTP stands for Simple Mail Transfer Protocol and uses TCP 25 port

Question 5

What SFTP stands for and what port it uses?

Answer 5

SFTP stands for Secure File Transfer Protocol and uses the same port as SSH (TCP 22)

Question 6

What FTP stands for and what ports it uses?

Answer 6

FTP stands for File Transfer Protocol and uses TCP 20 for active mode data and TCP 21 for control

Question 7

What TFTP stands for and what port it uses?

Answer 7

TFTP stands for Trivial File Transfer Protocol and uses UDP 69 (NICE)

Question 8

What DHCP stands for and what port it uses?

Answer 8

DHCP stands for Dynamic Host Configuration and uses both UDP 67 and UDP 68 ports

Question 9

What HTTP and HTTPS stand for and what ports they use?

Answer 9

HTTP stands for Hypertext Transfer Protocol and uses port TCP 80
HTTPS stands for Hypertext Transfer Protocol Secure and uses port TCP 443

Question 10

What’s Telnet?

Answer 10

Can login to devices
Has a console access
In-the-clear communication

Question 11

What’s Secure Shell

Answer 11

Same as Telnet but modern

Encrypted communication link

Question 12

What Domain Name System does?

Answer 12

Domain Name System converts names to IP addresses

Question 13

What’s Simple Mail Transfer Protocol (SMTP)?

Answer 13

Server to server email transfer

Used to send mail form a device to a mail server

Question 14

What’s SFTP?

Answer 14

Uses Secure Shell Transfer Protocol
Provides file system functionality such as resuming interrupted transfers, directory listings, remote file removal
Has encrypted communication

Question 15

What FTP does?

Answer 15

Transfers files between systems
Authenticates with username and password
Full-featured functionality (list, add, delete, etc.)

Question 16

What TFTP does?

Answer 16

It’s a very simple file transfer application that reads and writes files
Has no authentication

Question 17

What’s DHCP

Answer 17

It an automated configuration of IP address, subnet mask and other options

Question 18

What’s DHCP pooled?

Answer 18

IP addresses are assigned in real-time from a pool

Question 19

What’s DHCP reservation?

Answer 19

Addresses are assigned by MAC addresses in the DHCP server

Quickly manage addresses form one location

Question 20

What’s HTTP?

Answer 20

Web server communication

Question 21

What’s HTTPS?

Answer 21

Web server communication with encryption