Ports to remember

Question 1

6667

Answer 1

IRC Default port

Internet relay chat

Question 2

21 TCP

Answer 2

FTP - File Transfer Protocol is used to transfer files from hosts to host

Question 3

22 TCP / UDP

Answer 3

SSH, SCP, SFTP

Secure Shell is used to remotely administer network devices and systems. SCP is used for secure copy and SFTP for secure FTP.

Question 4

23 TCP / UDP

Answer 4

Telnet - Unencrypted method to remotely administer network devices (should not be used)

Question 5

25 TCP

Answer 5

SMTP - Simple Mail Transfer Protocol is used to send mail over the internet

Question 6

53 TCP / UDP

Answer 6

DNS

Domain Name Service is used to resolve hostnames to Ips and Ips to hostnames

Question 7

69 UDP

Answer 7

TFTP - Trivial FTP is used as simplified version of FTP to put a file on a remote host or get a file from a remote host
• Not secure but lightweight
• Often used to boot an operating system of a server an into a thin client

Question 8

80 tcp

Answer 8

Http - Hyper Transfer Protocol is used to transmit web page data to a client for unsecured web browsing

Question 9

88 TCP UDP

Answer 9

Kerberos - Used for Networks authentication using a system of tickers within a windows domain

Question 10

110 - TCP

Answer 10

POP3 - Post office protocol v3 is used to receive email from a mail server

Question 11

119 TCP

Answer 11

NNTP - Network news Transfer Protocol is used to transport Usenet articles

Question 12

135 TCP / UDP

Answer 12

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

Question 13

137-139 - TCP UDP

Answer 13

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

Question 14

143 TCP

Answer 14

IMAP - Internet Message Access Protocol is used to receive email from a mail server with more features than pop3

Question 15

161 UDP

Answer 15

SNMP - Simple Network Management Protocol is used to remotely monitor network devices

Question 16

162 TCP/UDP

Answer 16

SNMPTRAP - Used to send Trap and Inform Requests to the SNMP Manager on a network

Question 17

389 TCP UDP

Answer 17

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

Question 18

443 TCP

Answer 18

HTTPS
Hypertext Transfer Protocol Secure is used to transmit web page data to a client over an SSL / TLS encrypted connection

Question 19

445 TCP

Answer 19

SMB
Server message Block is used to provide shared access to files and other resources on a network

Question 20

465 / 587 TCP

Answer 20

SMTP with SSL/TLS - Simple mail Transfer Protocol used to send email over the internet with an SSL and TLS secured connection

Question 21

514 UDP

Answer 21

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

Question 22

636 TCP/UDP

Answer 22

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

Question 23

860 TCP

Answer 23

iSCSI -
iSCSI is used for linking data storage facilities over IP

Question 24

989 / 990 TCP

Answer 24

FTPS - File Transfer Protocol Secure is used to transfer files from host to host over an encrypted connection

Question 25

993 TCP

Answer 25

IMAP4 with SSL/TLS Internet Message Access Protocol used to receive email from a mail server over an SSL / TLS encrypted connection

Question 26

995 TCP

Answer 26

POP3 (SSL/TLS) Post Office Protocol v3 used to receive email from a mail server using an SSL/TLS encrypted connection

Question 27

1433 TCP

Answer 27

MS-SQL-S Microsoft SQL server is used to receive SQL database queries from clients

Question 28

1645 / 1646 UDP

Answer 28

RADIUS (alternative) Remote Authentication Dial-in User Service is used for authentication and authorization (1645) and accounting (1646)

Question 29

1701 UDP

Answer 29

L2DP Layer 2 Tunnel Protocol is used as an underlying VPN Protocol but has no inherent security

Question 30

1723 TCP/UDP

Answer 30

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

Question 31

1812 / 1813 UDP

Answer 31

Radium Remote Authentication Dial-in User Service is used for authentication and authorization (x) and Accounting (x)

Question 32

3225 TCP / UDP

Answer 32

FCIP - Fibre Channel IP is Used to encapsulate Fibre Channel frames within TCP/IP Packers

Question 33

3260 FCP

Answer 33

iSCSI Target iSCSI Target is a listening port for an iSCSI targeted devices when linking data storage facilities over IP

Question 34

3389 TCP UDP

Answer 34

RDP Remote Desktop Protocol is used to remotely view and control other Windows systems via a Graphical User Interface

Question 35

3868 TCP

Answer 35

Diameter A more advanced AAA protocol that is a replacement for RADIUS

Question 36

6514 TCP

Answer 36

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