Common Network Ports 2.1 - PM

Question 1

What does your device need to know when it connects to a service running on a server?

Answer 1

the port number of the service

(where will traffic be directed to to reach that service)

Question 2

What are well-known port numbers?

Answer 2

the standard/common port number our client uses that all services tend to use for that particular service

Question 3

What does FTP stand for?

Answer 3

File Transfer Protocol

Question 4

What are the port numbers for FTP?

Answer 4

tcp/20 (active mode data)
tcp/21 (control)

Question 5

What does FTP do?

Answer 5

Transfers files between systems and list, add, delete files etc

Question 6

What does SSH stand for?

Answer 6

Secure Shell

Question 7

What is the port number for SSH?

Answer 7

tcp/22

Question 8

In SSH, what is the “shell” referring to?

Answer 8

the text-based front end to the OS (window with command line looking text)

Question 9

What does Telnet stand for?

Answer 9

Telecommunication Network

Question 10

What is Telnet’s port number?

Answer 10

tcp/23

Question 11

What is Telnet used for?

Answer 11

To log into (legacy) devices remotely and use its console (can operate the OS with text)

Question 12

What does SMTP stand for?

Answer 12

Simple Mail Transfer Protocol

Question 13

What is the port number for SMTP?

Answer 13

tcp/25

Question 14

What is SMTP used for?

Answer 14

To send mail between mail servers, and also for clients to send email to a mail server

Question 15

What does DNS stand for?

Answer 15

Domain Name System

Question 16

What does DNS do?

Answer 16

converts a domain name to an IP address

Question 17

What port number does DNS operate on?

Answer 17

udp/53

Question 18

What does DHCP do?

Answer 18

automatically assigns IP addresses and other IP configuration (subnet mask, default gateway) settings to our local machines

Question 19

What ports does DHCP operate on?

Answer 19

udp/67
udp/68

Question 20

What does DHCP require?

Answer 20

a DHCP server (he says DNS server in the video though)

-server
-appliance
-integrated into SOHO router
etc

Question 21

Where does DHCP get the IP addresses to assign to your devices?

Answer 21

It has a large pool of IP addresses available to hand out

Question 22

Are assigned IP addresses permanent?

Answer 22

No they’re leased for a certain time and can be renewed UNLESS using DHCP reservations for permanent IP addresses for a device

Question 23

What are HTTP and HTTPS used for?

Answer 23

for web browser communication with web servers

Question 24

What does HTTP stand for?

Answer 24

HyperText Transfer Protocol

Question 25

What ports do HTTP and HTTPS use?

Answer 25

HTTP tcp/80 HTTPS tcp/443

Question 26

What does POP3 and IMAP stand for?

Answer 26

POP3 - Post Office Protocol version 3 IMAP - Internet Message Access Protocol v4

Question 27

What is POP3 and IMAP used for?

Answer 27

to receive emails from an email server (authenticate, transfer)

Question 28

What ports does POP3 and IMAP use?

Answer 28

POP3 - tcp/110 IMAP - tcp/143

Question 29

What's the difference between POP3 and IMAP?

Answer 29

POP3 doesn't allow us to synchronize emails and changes across devices

Question 30

What does SMB stand for?

Answer 30

Server Message Block

Question 31

What is SMB used for?

Answer 31

file sharing, printer sharing

Question 32

What is SMB also called?

Answer 32

CIFS (Common Internet File System)

Question 33

SMB protocol is used by what OS?

Answer 33

Microsoft Windows

Question 34

What ports would NetBIOS name services lookup and session service (transfer) use?

Answer 34

name services udp/137 session services transfer tc/139

Question 35

What port does the current SMB NetBIOS-less protocol use? (what is used today)

Answer 35

tcp/445

Question 36

What does SNMP stand for?

Answer 36

Simple Network Management Protocol

Question 37

What is SNMP used for?

Answer 37

Monitors infrastructure devices; sets up traps; queries devices to receive responses

Question 38

What ports does SNMP use for queries and traps?

Answer 38

queries - udp/161 traps - udp/162

Question 39

What version of SNMP is for older devices?

Answer 39

Version 1

Question 40

Which version of SNMP is encrypted and uses authentication?

Answer 40

Version 3

Question 41

What are SNMP traps?

Answer 41

when you configure devices to actively inform you of any problems or changes

Question 42

What is LDAP used for?

Answer 42

used to store and retrieve information in a org's network directory (like Active Directory)

Question 43

What port number does LDAP use?

Answer 43

tcp/389

Question 44

What is RDP used for?

Answer 44

to share a desktop or application from a remote location

Question 45

What port does RDP use?

Answer 45

tcp/3389

Question 46

What clients can use RDP?

Answer 46

clients using macOS, Android, Linux, etc can connect to a Windows comptuer