Port Numbers

Question 1

Port 21

Answer 1

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

Question 2

Port 22

Answer 2

TCP/UDP - Secure Shell (SSH) is used to remotely administer network devices and systems.
SCP is used for secure copy and SFTP for secure FTP.

Question 3

Port 23

Answer 3

TCP/UDP - Telnet, unencrypted method to remotely administer network devices (should not be used)

Question 4

Port 25

Answer 4

TCP - SMTP, Simple Mail Transfer Protocol is used to send email over the Internet

Question 5

Port 53

Answer 5

TCP/UDP- DNS, Domain Name Service is used to resolve hostnames to IPs and IPs to hostnames

Question 6

Port 69

Answer 6

UDP - 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

Answer 7

TCP - HTTP, Hyper Text Transfer Protocol is used to transmit web page data to a client for unsecured web browsing

Question 8

Port 88

Answer 8

TCP/UDP - Kerberos, used for network authentication using a system of tickets within a Windows domain

Question 9

Port 110

Answer 9

TCP - POP3, Post Office Protocol v3 is used to receive email from a mail server.

Question 10

Port 119

Answer 10

TCP - NNTP, Network News Transfer Protocol is used to transport Usenet articles.

Question 11

Port 135

Answer 11

TCP/UDP - Remote Procedure Call is used to located DCOM ports request a service from a program on another computer on the network

Question 12

Port 137-139

Answer 12

TCP/UDP - NetBIOs, is used to conduct name querying, sending of data, and other functions over a NetBIOS connection.

Question 13

Port 143

Answer 13

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

Question 14

Port 161

Answer 14

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

Question 15

Port 162

Answer 15

TCP/UDP - SNMPTRAP, Used to send Trap and InformRequests to the SNMP Manager on a network.

Question 16

Port 389

Answer 16

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

Question 17

Port 443

Answer 17

TCP - 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

Answer 18

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

Question 19

Port 465/587

Answer 19

TCP - SMTP, Simple Mail Transfer Protocol used to send email over the Internet with an SSL and TLS secured connection.

Question 20

Port 514

Answer 20

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

Question 21

Port 636

Answer 21

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

Question 22

Port 860

Answer 22

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

Question 23

Port 989/990

Answer 23

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

Question 24

Port 995

Answer 24

TCP - POP3, Post Office Protocol v3 is used to receive email from a mail server using an SSL/TLS-encrypted connection.

Question 25

Port 993

Answer 25

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

Question 26

Port 1433

Answer 26

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

Question 27

Port 1645/1646

Answer 27

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

Question 28

Port 1701

Answer 28

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

Question 29

Port 1723

Answer 29

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

Question 30

Port 1812/1813

Answer 30

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

Question 31

Port 3225

Answer 31

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

Question 32

Port 3260

Answer 32

TCP - iSCSI Target is as the listening port for iSCSI-targeted devices when linking data storage facilities over IP.

Question 33

Port 3389

Answer 33

TCP/ UDP - RDP, Remote Desktop Protocol is used to remotely view and control other Windows systems via a Graphical User Interface.

Question 34

Port 3868

Answer 34

TCP - DIAMETER, A more advanced AAA protocol that is a replacement for RADIUS

Question 35

Port 6514

Answer 35

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