Common Ports

Question 1

What is Telnet?

Answer 1

Telecommunication Network

Question 2

What port is Telnet?

Answer 2

tcp/23

Question 3

What does Telnet do?

Answer 3

Login to devices
Console Access
In-the-clear communication

Question 4

Why is Telnet not the best choice for production systems?

Answer 4

Your data is not encrypted (it butt naked)

Question 5

What does SSH stand for?

Answer 5

Secure Shell

Question 6

What port is SSH?

Answer 6

tcp/22

Question 7

What does SSH do?

Answer 7

Encryption communication link

Looks and acts just as Telnet

Question 8

What does DNS stand for?

Answer 8

Domain Name System

Question 9

What does DNS do?

Answer 9

Converts names to IP addresses

Question 10

What port is DNS?

Answer 10

udp/53

Question 11

What does SMTP stand for?

Answer 11

Simple Mail Transfer Protocol

Question 12

What does SMTP do?

Answer 12

Sever to server email transfer

Question 13

What does SFTP stand for?

Answer 13

Secure File Transfer Protocol

Question 14

What does SFTP use?

Answer 14

Uses the SSHFTP

Question 15

What does SFTP do?

Answer 15

Provides file system functionality- resumes interrupted transfers, directory listings, remote file removal.
Encrypted Communication- using SSH

Question 16

What port is SFTP?

Answer 16

tcp/22

Question 17

What does FTP stand for?

Answer 17

File Transport Protocol

Question 18

What port is FTP?

Answer 18

tcp/20

Question 19

What does FTP do?

Answer 19

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

Question 20

What does TFTP stand for?

Answer 20

Trivial File Transfer Protocol

Question 21

What port is TFTP?

Answer 21

udp/69

Question 22

What does TFTP do?

Answer 22

Very simple file transfer application- read and write files

No authentication- not used on production systems

Question 23

What does DHCP stand for?

Answer 23

Dynamic Host Configuration Protocol

Question 24

What ports are DHCP?

Answer 24

udp/67, udp/68

Question 25

What does DHCP do?

Answer 25

Automated configuration of IP address, subnet, ask, and other options.

Question 26

What requires a DHCP server?

Answer 26

Service, appliance, integrated into a SOHO router, etc..

Question 27

What does Dynamic/Pooled mean?

Answer 27

IP addresses are assigned in real-time from a pool. | Each system is given a lease and must renew at set intervals.

Question 28

What is DHCP Reservation?

Answer 28

Addresses are assigned by MAC address in the DHCP server. | Quickly manage addresses from one location.

Question 29

What does HTTP stand for?

Answer 29

Hypertext Transfer Protocol

Question 30

What does HTTPS stand for?

Answer 30

Hypertext Transfer Protocol Secure

Question 31

What does HTTP do?

Answer 31

Communication in the browser and by other applications. | In the clear or encrypted- supported by nearly all web servers and clients.

Question 32

What port is HTTP?

Answer 32

tcp/80

Question 33

What port is HTTPS?

Answer 33

tcp/443

Question 34

What does SNMP stand for?

Answer 34

Simple Network Management Protocol

Question 35

What port is SNMP?

Answer 35

udp/161

Question 36

What is V1 of SNMP?

Answer 36

The Original - Structured tables - In-the-clear

Question 37

What is V2 of SNMP?

Answer 37

A good step ahead - Data type enhancements - Bulk transfers - Still in-the-clear

Question 38

What is V3 of SNMP

Answer 38

A secure standard - Message Integrity - Authentication - Encryption