Ports

Question 1

Port 21 - TCP

Answer 1

FTP

File Transfer Protocol is used to transfer files from host to host.

Question 2

Port 22 - TCP/UDP

Answer 2

SSH, SCP, SFTP

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

Question 3

Port 23 - TCP/UDP

Answer 3

Telnet

Unencrypted method to remotely administer network devices
Do NOT use!

Question 4

Port 25 - TCP

Answer 4

SMTP

Simple Mail Transfer Protocol is used to send email over the internet.

Question 5

Port 53 -TCP/UDP

Answer 5

DNS

Domain Name Service is used to resolve hostnames to IPs and IPs to hostnames.

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

Port 80 - TCP

Answer 7

HTTP

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

Question 8

Port 88 - TCP/UDP

Answer 8

Kerberos

Used for network authentication using a system of tickets within a windows domain.

Question 9

Port 110 - TCP

Answer 9

POP3

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

Question 10

Port 119 - TCP

Answer 10

NNTP

Network News Transfer Protocol is used to transfer Usenet articles.

Question 11

Port 135 - TCP/UDP

Answer 11

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 12

Port 137-139 - TCP/UDP

Answer 12

NetBios

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

Question 13

Port 143 - TCP

Answer 13

IMAP

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

Question 14

Port 161 - UDP

Answer 14

SNMP

Simple Network Management Protocol is used to remotely monitor network devices.

Question 15

Port 162 - TCP/UDP

Answer 15

SNMPTRAP

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

Question 16

Port 389 - TCP/UDP

Answer 16

LDAP

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

Question 17

Port 443 - TCP

Answer 17

HTTPS

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

Question 18

Port 445 - TCP

Answer 18

SMB

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

Question 19

Port 465/587 - TCP

Answer 19

SMTP with SSL/TLS

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

Question 20

Port 514 - UDP

Answer 20

Syslog

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

Question 21

Port 636 - TCP/UDP

Answer 21

LDAP SSL/TLS

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

Question 22

Port 860 - TCP

Answer 22

iSCSI

iSCSI is used for linking data storage facilities over IP.

Question 23

Port 989/990 - TCP

Answer 23

FTPS

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

Question 24

Port 993 - TCP

Answer 24

IMAP4 with SSL/TLS

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

Question 25

Port 995 - TCP

Answer 25

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

Question 26

Port 1433 -TCP

Answer 26

Ms-sql-s Microsoft SQL server is used to receive SQL database queries from clients.

Question 27

Port 1645/1646 - UDP

Answer 27

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

Question 28

Port 1701 - UDP

Answer 28

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

Question 29

Port 1723 - TCP/UDP

Answer 29

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

Question 30

Port 1812/1813 - UDP

Answer 30

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

Question 31

Port 3225 - TCP/UDP

Answer 31

FCIP Fibre Channel IP is used to encapsulate Fibre Channel frames within TCP/IP packets.

Question 32

Port 3260 - TCP

Answer 32

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

Question 33

Port 3389 - TCP/UDP

Answer 33

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

Question 34

Port 3868 - TCP

Answer 34

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

Question 35

Port 6514 - TCP

Answer 35

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