Common Ports (2.1)

Question 1

What port does FTP (File Transfer Protocol) use?

Answer 1

tcp/20, tcp/21

Question 2

What port does SSH (Secure Shell) use?

Answer 2

tcp/22

Question 3

What port does (Telnet Telecommunication Network) Use?

Answer 3

tcp/23

Question 4

What port does DNS (Domain Name System) use?

Answer 4

udp/53, tcp/53

Question 5

What port does HTTP (Hypertext Transfer Protocol) use?

Answer 5

tcp/80

Question 6

What port does HTTPS (Hypertext Transfer Protocol Secure) use?

Answer 6

tcp/443

Question 7

What port does POP3 (Post office protocol Version 3) use?

Answer 7

tcp/110

Question 8

What port does IMAP4 (Internet Message Access Protocol V4) use?

Answer 8

tcp/143

Question 9

What port does RDP (Remote Desktop Protocol) use?

Answer 9

tcp/3389

Question 10

What port does NetBIOS Name service use?

Answer 10

udp/137

Question 11

What port does NetBIOS datagram service use?

Answer 11

udp/138

Question 12

What port does NetBios session service use?

Answer 12

udp /139

Question 13

What port does SMB (Server Message Block) use?

Answer 13

tcp/445

Question 14

What port does AFP (Apple Filing Protocol) use?

Answer 14

tcp/548

Question 15

What port does SLP (Service Location Protocol) use?

Answer 15

tcp/427, udp/427

Question 16

What port does DHCP (Dynamic Host Configuration Protocol) use?

Answer 16

udp/67, udp/68

Question 17

What port does LDAP (Lightweight Directory Access Protocol) use?

Answer 17

tcp/389

Question 18

What port does SNMP (Simple Network Management Protocol) use?

Answer 18

udp/161

Question 19

What is FTP?

Answer 19

File Transfer Protocol

FTP Sends and receives files between systems

Question 20

What is SSH

Answer 20

Secure Shell

SSH is a software standard to support encrypted data transfer between two computers. It can be used to support secure logins, file transfers or general-purpose connects. Servers maintained by ITS require SSH-based connections in most cases. (Encrypted console access)

Question 21

What is Telnet?

Answer 21

Telecommunication Network

Telnet enables a user to manage an account or device remotely. (Insecure console access)

Question 22

What is SMTP?

Answer 22

Simple Mail Transfer Protocol

SMTP is part of the application layer of the TCP/IP protocol. Using a process called “store and forward,” SMTP moves your email on and across networks. It works closely with something called the Mail Transfer Agent (MTA) to send your communication to the right computer and email inbox.

Question 23

What is DNS?

Answer 23

Domain Name System

Converts domain names to IP addresses (Its like a phone book)

Question 24

What is HTTP & HTTPS?

Answer 24

Hypertext Transfer Protocol / Hypertext Transfer Protocol Secure

HTTPS is an extension of the HTTP. It is used for secure communication over a computer network and is widely used on the Internet.

Question 25

What is POP3

Answer 25

Post Office Protocol Version 3 POP3 is an Internet standard protocol used by local email software clients to retrieve emails from a remote mail server over a TCP/IP connection.

Question 26

What is IMAP4

Answer 26

Internet Message Access Protocol v4 IMAP enables a user's email program to access the mail server

Question 27

What is RDP?

Answer 27

Remote Desktop Protocol RDP is a secure network communications protocol designed for remote management, as well as for remote access to virtual desktops

Question 28

What is NetBIOS?

Answer 28

NetBIOS name service, NetBIOS datagram service, NetBIOS session service NetBIOS is a non-routable OSI Session Layer 5 Protocol and a service that allows applications on computers to communicate with one another over a local area network (LAN).

Question 29

What is SMB?

Answer 29

Server Message Block SMB is a client-server communication protocol used for sharing access to files, printers, serial ports and other resources on a network.

Question 30

What is AFP?

Answer 30

Apple Filing Protocol AFP is a proprietary network protocol, and part of the Apple File Service, that offers file services for macOS and the classic Mac OS.

Question 31

What is SLP?

Answer 31

Service Location Protocol SLP is a service discovery protocol that allows computers and other devices to find services in a local area network without prior configuration.

Question 32

What is DHCP?

Answer 32

Dynamic Host Configuration Protocol DHCP is a protocol that provides quick, automatic, and central management for the distribution of IP addresses within a network.

Question 33

What is LDAP?

Answer 33

Lightweight Directory Access Protocol LDAP is an open, vendor-neutral, industry standard application protocol for accessing and maintaining distributed directory information services over an Internet Protocol network.

Question 34

What is SNMP?

Answer 34

Simple Network Management Protocol SMNP is a set of protocols for network management and monitoring. These protocols are supported by many typical network devices such as routers, hubs, bridges, switches, servers, workstations, printers, modem racks and other network components and devices.