Comptia Network+ (N10-006): Ports

Front 1

TCP 20/21

Back 1

FTP - File Transfer Protocol

Front 2

TCP 22

Back 2

SSH - Secure Shell, which is used in:

SFTP - Secure File Transfer Protocol

SCP - Secure Copy

Front 3

TCP 23

Back 3

Telnet - used to connect to a remote host

Front 4

TCP 25

Back 4

SMTP - Simple Mail Transfer Protocol - sending email

Front 5

TCP/UDP 53

Back 5

DNS - Domain Name System

Front 6

UDP 67/68

Back 6

DHCP - Dynamic Host Configuration Protocol (IP assignment)

Front 7

UDP 69

Back 7

TFTP - Trivial File Transfer Protocol (no authentication)

Front 8

TCP 80

Back 8

HTTP - Hypertext Transfer Protocol

Front 9

TCP/UDP 88

Back 9

Kerberos - Windows authentication

Front 10

TCP 110

Back 10

POP3 - Post Office Protocol 3 - retrieving email from a server

Front 11

TCP 119

Back 11

NNTP - Network News Transfer Protocol - Usenet news server communication

Front 12

UDP 123

Back 12

NTP - Network Time Protocol - time synchronization with a time server

SNTP - Simple Network Time Protocol - time sync among network devices

Front 13

UDP 137/138/TCP 139

Back 13

NetBIOS network communication services

Front 14

TCP 143

Back 14

IMAP - Internet Message Access Protocol - retrieving email from server

Front 15

UDP 161

Back 15

SNMP - Simple Network Management Protocol unencrypted agent listening port

(10161 is used for encryption)

Front 16

TCP/UDP 162

Back 16

SNMP Trap - Simple Network Management Protocol unencrypted manager listening port - trap notification from agent to manager

(10162 is used for encryption)

Front 17

TCP 194

Back 17

IRC -Internet Relay Chat - text-to-text chat

Front 18

TCP 389

Back 18

LDAP - Lightweight Directory Access Protocol - directory services

Front 19

TCP 443

Back 19

HTTPS - Secure HTTP

Front 20

TCP 445

Back 20

SMB - Server Message Block - share files, printers, network resources

Front 21

UDP 514

Back 21

rsh - Remote Shell - remote control

Front 22

UDP 520

Back 22

RIP - Routing Information Protocol - distance vectoring

Front 23

UDP 521

Back 23

RIPng - RIP for IPv6 (next generation)

Front 24

TCP/UDP 554

Back 24

RTSP - Real-Time Streaming Protocol - playback control of server media files

Front 25

UDP 1512

Back 25

WINS - Windows Internet Name Service (DNS for NetBIOS)

Front 26

UDP 1701

Back 26

L2TP - Layer 2 Tunneling Protocol - VPN support

Front 27

TCP 1720

Back 27

H.323 - signaling protocol providing multimedia communications

Front 28

UDP 1812/1813

Back 28

RADIUS - Remote Authentication Dial-In User Service - provides centralized AAA (Authentication, Authorization, Accounting)

Front 29

UDP 2049

Back 29

NFS - Network File System - drive mapping protocol

Front 30

UDP 2427/2727

Back 30

MGCP - Media Gateway Control Protocol - call control and communications for VIOP

Front 31

TCP 3389

Back 31

RDP - Remote Desktop Protocol - remote control

Front 32

TCP/UDP 5004/5005

Back 32

RTP - Real-time Transport Protocol - delivers media-based data, including VOIP

Front 33

TCP 5061/UDP 5060

Back 33

SIP - Session Initiation Protocol - create/end sessions for media connections (VOIP, e.g.)

Front 34

UDP 10161

Back 34

SNMP - Simple Network Management Protocol encrypted (using Transport Layer Security) agent listening port

(161 is used for no encryption)

Front 35

TCP/UDP 10162

Back 35

SNMP Trap - Simple Network Management Protocol encrypted (using Transport Layer Security) manager listening port - trap notification from agent to manager

(162 is used for no encryption)