PORT #s /w Use

Question 1

PORT 20 & 21?

Answer 1

File Transfer Protocol (FTP)

20 (TCP) = Active Mode
21 (TCP) = Control
Used to Transfer Files between a Client and a Server.

Question 2

PORT 548?

Answer 2

Apple Filing Protocol (AFP)

Formally AppleTalk Filing Protocol, is a proprietary Network Protocol, and part of the Apple File Service that offers services for macOS and the Classic MacOS.

Question 3

PORT 80?

Answer 3

Hypertext Transfer Protocol (HTTP)

TCP
A Protocol that Enables the World Wide Web (WWW).

Question 4

PORT 22?

Answer 4

Secure Shell (SSH)

TCP
One of several Tunneling Protocols used to build Secure Network Connections.

Question 5

PORT 53?

Answer 5

Domain Name System (DNS)

(TCP)
Critical process that matches human-readable domain names to machine readable IP Addresses on the modern Internet.
Helps users load websites and applications without typing in a long list of IP Addresses.

Question 6

PORT 110?

Answer 6

Post Office Protocol v3 (POP3)

TCP
Application-Layer Internet Standard Protocol used by Email Clients to RETRIEVE Email from a Mail Server.

Question 7

PORT 25?

Answer 7

Simple Mail Transfer Protocol (SMTP)

TCP
The Default Port that Mail Servers use.

Question 8

PORT 427?

Answer 8

Service Location Protocol (SLP)

Used by MacOS and NetWare

Question 9

PORT 143?

Answer 9

Internet Mail Access Protocol (IMAP)

Email Servers use this Port.

Question 10

PORT 23?

Answer 10

Telnet

(TCP/UDP)
One of the oldest Internet Protocols and the most popular program for Remote Access to Unix machines.
Numerous Security Vulnerabilities.

Question 11

PORT 443?

Answer 11

Hypertext Transfer Protocol over SSL/TLS (HTTPS)

Encrypted/Secured Web Traffic, also used for VPN Tunnels.

Question 12

PORT 3389?

Answer 12

Remote Desktop Protocol (RDP)

Proprietary Protocol developed by Microsoft which provides a user with a graphical interface to connect to another computer over a Network.

Question 13

PORT 137 to 139?

Answer 13

Network Basic Input/Output System (NetBIOS)/NetBT

Provides services related to Session-Layer on the OSI Model, allows applications on separate computers to communicate over a LAN.

Question 14

PORT 445?

Answer 14

Server Message Block/Common Internet File System (SMB/CIFS)

A Communication Protocol for Providing Shared Access to files and printers between nodes on a Network.
Provides an Authenticated Inter-Process communication mechanism.

Question 15

PORT 123?

Answer 15

Network Time Protocol (NTP)

Helps Computer clocks sync with each other.
It’s a vital process in Encryption.

Question 16

PORT 179?

Answer 16

Border Gateway Protocol (BGP)

Helps establish efficient routes between the large Networks and autonomous systems that make up the Internet.

Question 17

PORT 500?

Answer 17

Internet Security Association and Key Management Protocol (IPSec)

Helps setup secure IP Security.

Question 18

PORT 389?

Answer 18

Lightweight Directory Access Protocol (LDAP)

Is an Open, Vender-Neutral industry standard application Protocol for accessing and maintaining distributed directory information services over an IP Network.

Question 19

PORT 88?

Answer 19

Kerberos

(TCP/UDP)
Kerberos is a Computer-Network Authentication Protocol that works on the basis of Tickets to allow nodes communicating over a Non-Secure Network to provide their identity to one another in a secure manner.

Question 20

PORT 636?

Answer 20

Secure Lightweight Directory Access Protocol (SLDAP)

Question 21

PORT 161, 162?

Answer 21

Simple Network Management Protocol (SNMP)

Used to manage Network devices such as Routers and Switches.

Question 22

PORT 1723?

Answer 22

Point-To-Point Tunneling Protocol (PPTP)

Used in VPNs.

Question 23

PORT 1701?

Answer 23

Layer 2 Tunneling Protocol (L2TP)

Used in VPNs.

Question 24

PORT 67, 68?

Answer 24

Dynamic Host Configuration Protocol (DHCP)

Question 25

PORT 69?

Answer 25

Trivial File Transfer Protocol (TFTP)

UDP

Question 26

PORT 7?

Answer 26

Echo

TCP/UDP