Well Known Ports and Services

Question 1

Port 22 TCP/UDP

Answer 1

SSH, SCP, SFTP
Secure Shell, Secure Copy, Secure FTP
remote access to shell (think terminal) for boxes and systems.

Question 2

Port 23 TCP/UDP

Answer 2

TELNET

Unencrypted method to remotely access network devices (should not be used {free roots baby})

Question 3

Port 21

Answer 3

FTP
________________________________________________
File Transfer Protocol is used to transfer files from host to host

Question 4

Port 25 TCP

Answer 4

SMTP
Simple Mail Transfer Protocol
is used to transfer email.

Question 5

Port 53 TCP/UDP

Answer 5

DNS

Domain Name Server is used to resolve hostnames and IPs and vice versa.

Question 6

Port 69 UDP

Answer 6

TFTP

Trivial FTP is used as a simplified version of FTP to put a file on a remote host, or get a file from a remote host

Question 7

80 TCP

Answer 7

HTTP

Hyper Text Transfer Protocol is used to transmit web page data to clients for unsecured browsing.

Question 8

Port 88 TCP/UDP

Answer 8

Kerberos

Used for network authentication using a system of tickets within a Windows domains.

Question 9

Port 110 TCP

Answer 9

POP3

Post Office Protocol v3 is used to receive email from a mail server

Question 10

Port 135 TCP/UDP

Answer 10

RPC/DCOM-scm
Remote Procedure Call is used to locate DCOM ports to request a service from a program on another computer on the network.

Question 11

Port 137-139 TCP/UDP

Answer 11

NetBIOS

NetBIOS is used to conduct name querying, sending of data, and other functions over a NetBIOS connection.

Question 12

Port 143 TCP

Answer 12

IMAP

Internet Message Access Protocol is used to receive email from a mail server with more features than POP3

Question 13

Port 162 TCP/UDP

Answer 13

SNMPTRAP

Used to send Trap and Informrequests to the SNMP Manager on a network.

Question 14

389 TCP/UDP

Answer 14

LDAP

Lightweight Directory Access Protocol is used to maintain directories of users and other objects.

Question 15

Port 443 TCP

Answer 15

HTTPS

Hyper Text Transfer Protocol Secure is used to transmit web page data to a client over an SSL/TLS encrypted connection.

Question 16

Port 445 TCP

Answer 16

SMB

Server Message Block is used to provide shared access to files and other resources on a network.

Question 17

465/587 TCP

Answer 17

SMTP with SSL/TLS

Simple Mail Transfer Protocol used to send email over the internet with an SSL and TSL connection secured connection.

Question 18

Port 514 UDP

Answer 18

Syslog

Syslog is used to conduct computer message logging, especially for routers and firewall logs.

Question 19

Port 663 TCP/UDP

Answer 19

LDAP SSL/TLS

LDAP is used to maintain directories of users and other objects over an encrypted SSL/TLS connection.

Question 20

Port 860 TCP

Answer 20

iSCUSI

is used for linking data storage facilities over IP

Question 21

Port 989/990 TCP

Answer 21

FTPS

File Transfer Protocol Secure is used to transfer files from host to host over encrypted connection.

Question 22

Port 995 TCP

Answer 22

POP3 (SSL/TSL)

Post Office Protocol Version 3 used to receive email from a mail server using an SSL/TLS encrypted connection.

Question 23

Port 1433 TCP

Answer 23

Microsoft SQL server is used to receive SQL database queries from clients.

Question 24

Port 1645/1646 UDP

Answer 24

RADIUS (alternative)

Remote Authentication Dial-In User Service is used for authentication (1645 )and authorization (1646).

Question 25

Port 1701 UDP

Answer 25

L2TP | Layer 2 Tunnel Protocol is used as an underlying VPN protocol and has no inherent security.

Question 26

Port 1723 TCP/UDP

Answer 26

PPTP | Point-to-Point Tunneling Protocol is an underlying VPN with built-in security.

Question 27

Port 1812/1813 UDP

Answer 27

RADIUS Remote Authentication Dial-In User Service is used for authentication and authorization (1812) and accounting (1813).

Question 28

Port 3225 TCP/UDP

Answer 28

FCIP | Fibre channel IP is used to encapsulate fibre channel frames within TCP/IP packets.

Question 29

Port 3389 TCP/UDP

Answer 29

RDP | Remote Desktop Protocol is used to remotely view and control other Windows systems via a graphical user interface

Question 30

Port 3868 TCP

Answer 30

Diameter | Amore advanced version of AAA protocol that is a replacement for RADIUS

Question 31

Port 6514 TCP

Answer 31

Syslog over TLS It is used to conduct computer logging messaging, especially for routers and firewall logs, over a TLS encrypted connection