Ports

Question 1

21 TCP

Answer 1

FTP (File Transfer Protocol)

Used to transfer files from host to host

Question 2

22 TCP/UDP

Answer 2

SSH, SCP, SFTP
Secure shell used to remotely administer network devices and systems. SCP used for secure copy.
SFTP for secure File Transfer Protocol.

Question 3

23 TCP/UDP

Answer 3

Telnet

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

Question 4

25 TCP

Answer 4

SMTP

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

Question 5

53 TCP/UDP

Answer 5

DNS

Domain Name Service is used to resolve host names to IPs and IPs to host names.

Question 6

69 UDP

Answer 6

TFTP
Trivial File Transfer Protocol used as simplified version of FTP to put file on a remote host, or get a file from a remote host.

Question 7

80 TCP

Answer 7

HTTP

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

Question 8

88 TCP/UDP

Answer 8

Kerberos

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

Question 9

110 TCP

Answer 9

POP3

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

Question 10

119 TCP

Answer 10

NNTP

Network News Transfer Protocol is used to transport Usenet articles.

Question 11

135 TCP/UDP

Answer 11

RPC/DCOM-scm

Remote procedure call is used to located DCOM ports request a service from a program on another computer in the network.

Question 12

137-139 TCP/UDP

Answer 12

NetBIOS

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

Question 13

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

161 UDP

Answer 14

SNMP

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

Question 15

162 TCP/UDP

Answer 15

SNMPTRAP

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

Question 16

389 TCP/UDP

Answer 16

LDAP

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

Question 17

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

445 TCP

Answer 18

SMB

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

Question 19

465/587 TCP

Answer 19

SMTP w/ SSL/TLS

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

Question 20

514 UDP

Answer 20

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

Question 21

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

860 TCP

Answer 22

iSCI

iSCI is used for linking data storage facilities over IP.

Question 23

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

993 TCP

Answer 24

IMAP4 w/ SSL/TLS

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

Question 25

995 TCP

Answer 25

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

Question 26

1433 TCP

Answer 26

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

Question 27

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

1701 UDP

Answer 28

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

Question 29

1723 TCP/UDP

Answer 29

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

Question 30

1812/-1813 UDP

Answer 30

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

Question 31

3225 TCP/UDP

Answer 31

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

Question 32

3260 TCP

Answer 32

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

Question 33

3389 TCP/UDP

Answer 33

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

Question 34

3868 TCP

Answer 34

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

Question 35

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.