Network Ports

Question 1

21

Answer 1

TCP

FTP: File Transfer Protocol

Question 2

22

Answer 2

TCP, UDP
SSH, SCP, SFTP 
SSH is Secure Shell, used for remote admin
SCP is secure copy
SFTP is secure file transfer

Question 3

23

Answer 3

TCP, UDP
Telnet
Unencrypted protocol for remote admin
DO NOT USE. Block this port!

Question 4

25

Answer 4

TCP
SMTP
Simple Mail Transfer Protocol
common email service

Question 5

53

Answer 5

TCP, UDP
DNS
Domain Name Service
Resolves hostnames to IPs and IPs to hostnames

Question 6

69

Answer 6

UDP
TFTP
Trivial FTP. Simplified version of FTP. Not secure.

Question 7

80

Answer 7

TCP
HTTP
web browsing, not secure

Question 8

88

Answer 8

TCP, UDP
Kerberos
Network authentication using tickets in Windows domain

Question 9

110

Answer 9

TCP
POP3
Post Office Protocol v3. Another common email service

Question 10

119

Answer 10

TCP
NNTP
Network News Transfer Protocol
transports Usenet articles

Question 11

135

Answer 11

TCP, UDP
RPC/DCOMscm
Remote Procedure Call locates DCOM ports to request a service from a program on another computer on the network

Question 12

137

Answer 12

137, 138, 139 TCP, UDP
NetBIOS
Used to conduct name querying, sending of data, and other functions

Question 13

143

Answer 13

TCP
IMAP
Internet Message Access Protocol
another email service, with more features than POP3

Question 14

161

Answer 14

UDP
SNMP
Simple Network Management Protocol
remotely monitors network devices

Question 15

162

Answer 15

TCP, UDP
SNMPTRAP
sends Trap and InformRequests to the SNMP Manager on a network

Question 16

389

Answer 16

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

Question 17

443

Answer 17

TCP
HTTPS
Hyper Text Transfer Protocol Secure
secure web browsing. Uses SSL/TLS encrypted connection

Question 18

445

Answer 18

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

Question 19

465

Answer 19

TCP
SMTP with SSL/TLS
Secured SMTP email. Also uses port 587

Question 20

587

Answer 20

TCP
SMTP with SSL/TLS
Secured SMTP email. Also uses port 465

Question 21

514

Answer 21

UDP
Syslog
used to conduct message logging, esp for router and firewall logs

Question 22

636

Answer 22

TCP, UDP
LDAP SSL/TLS
Secure version of LDAP. Used to maintain directories of users and other objects

Question 23

860

Answer 23

TCP
iSCSI
used for linking data storage facilities over IP

Question 24

989

Answer 24

TCP
FTPS
File Transfer Protocol Secure. Also uses port 990

Question 25

990

Answer 25

TCP FTPS File Transfer Protocol Secure. Also uses port 989

Question 26

993

Answer 26

TCP IMAP4 with SSL/TLS Internet Message Access Protocol over SSL/TLS email with more features than POP3

Question 27

995

Answer 27

TCP POP3 SSL/TLS Secure version of POP3 email

Question 28

1433

Answer 28

TCP MS SQL Server database

Question 29

1645

Answer 29

UDP RADIUS Remote Authentication Dial-In User Service Uses 1645 for authentication and 1646 for accounting. Also uses 1812/1813 similarly, with 1812/1813 being the main ports

Question 30

1812

Answer 30

UDP RADIUS Remote Authentication Dial-In User Service Uses 1812 for authentication and 1813 for accounting. Also uses 1645/1646 similarly, with 1812/1813 being the main ports

Question 31

1701

Answer 31

UDP L2TP Layer 2 Tunnel Protocol underlying VPN protocol but has no inherent security

Question 32

1723

Answer 32

TCP, UDP PPTP Point to Point Tunneling Protocol a VPN protocol with built in security

Question 33

3225

Answer 33

TCP, UDP FCIP Fibre Channel IP Encapsulates Fibre Channel frames within TCP/IP packets

Question 34

3260

Answer 34

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

Question 35

3389

Answer 35

TCP, UDP RDP Remote Desktop Protocol Windows only

Question 36

3868

Answer 36

TCP Diameter More advanced replacement for RADIUS

Question 37

6514

Answer 37

TCP Syslog over TLS Secure version of Syslog for logging of messaging from firewalls, routers, etc.