Net+ Ports

Question 1

Port 20

Answer 1

Protocol: Data
FTP
TCP
File transfer (unsecure)

Question 2

Port 21

Answer 2

Protocol: Control
FTP
TCP
File transfer (unsecure)

Question 3

Port 22

Answer 3

Protocol: SSH/SCP/SFTP
TCP
Secure connection/Secure file transfer

Question 4

Port 23

Answer 4

Protocol: TELNET
TCP
Unsecure connections

Question 5

Port 25

Answer 5

Protocol: SMTP
TCP
Outbound email

Question 6

Port 49

Answer 6

Protocol: TACACS
TCP
Authentication service

Question 7

Port 53

Answer 7

Protocol: DNS
TCP/UDP
Domain Name Service

Question 8

Port 67

Answer 8

Protocol: Client to Server
DHCP IPV4
UDP
I.P. Management

Question 9

Port 68

Answer 9

Protocol: Server to Client
DHCP IPV4
UDP
I.P. Management

Question 10

Port 69

Answer 10

Protocol: TFTP
UDP
File transfer (unsecure)

Question 11

Port 80

Answer 11

Protocol: HTTP
TCP
Web traffic (unsecure)

Question 12

Port 88

Answer 12

Protocol: Kerberos
TCP
Authentication service

Question 13

Port 110

Answer 13

Protocol: POP3
TCP
Inbound email through an email client

Question 14

Port 119

Answer 14

Protocol: NNTP
TCP
News service

Question 15

Port 123

Answer 15

Protocol: NTP
UDP
Network time synchronization

Question 16

Port 137

Answer 16

Protocol: Client names
NETBIOS
UDP
Legacy protocol for legacy applications

Question 17

Port 138

Answer 17

Protocol: Datagrams
NETBIOS
UDP
Legacy protocol for legacy applications

Question 18

Port 139

Answer 18

Protocol: Sessions
NETBIOS
TCP
Legacy protocol for legacy applications

Question 19

Port 143

Answer 19

Protocol: IMAP4
TCP
Inbound email via web browser

Question 20

Port 161

Answer 20

Protocol: NMS to Agent
SNMPV3
UDP
Network management

Question 21

Port 162

Answer 21

Protocol: Agent to NMS
SNMPV3
UDP
Network management

Question 22

Port 389

Answer 22

Protocol: LDAP
TCP
Directory access (unsecure)

Question 23

Port 443

Answer 23

Protocol: HTTPS
TCP
Web traffic (secure)

Question 24

Port 445

Answer 24

Protocol: SMB/CIFS
TCP
File sharing

Question 25

Port 500

Answer 25

Protocol: ISAKMP (IPSEC) TCP Encryption Key Management

Question 26

Port 546

Answer 26

Protocol: Client to Server DHCP IPV6 UDP I.P. Managment

Question 27

Port 547

Answer 27

Protocol: Server to Client DHCP IPV6 UDP I.P. Management

Question 28

Port 636

Answer 28

Protocol: LDAPS TCP Directory access (secure)

Question 29

Port 989

Answer 29

Protocol: Data FTPS TCP File transfer (secure)

Question 30

Port 990

Answer 30

Protocol: Control FTPS TCP File transfer (secure)

Question 31

Port 993

Answer 31

Protocol: IMAP4 over SSL TCP Secure email

Question 32

Port 995

Answer 32

Protocol: POP3 over SSL TCP Secure email

Question 33

Port 1701

Answer 33

Protocol: L2TP TCP Tunneling protocol

Question 34

Port 1720

Answer 34

Protocol: H.323 TCP Signaling protocol

Question 35

Port 1723

Answer 35

Protocol: PPTP TCP Tunneling protocol

Question 36

Port 1812

Answer 36

Protocol: Authentication RADIUS UDP Authentication service

Question 37

Port 1813

Answer 37

Protocol: Accounting RADIUS UDP Authentication service

Question 38

Port 2427

Answer 38

Protocol: MDC to Gateways MGCP TCP/UDP Signaling protocol

Question 39

Port 2727

Answer 39

Protocol: Gateways to MGC MGCP TCP/UDP Signaling protocol

Question 40

Port 3389

Answer 40

Protocol: RDP TCP/UDP Remote access for computers

Question 41

Port 5004

Answer 41

Protocol: RTP UDP Transfers voice/video

Question 42

Port 5005

Answer 42

Protocol: RTCP UDP Transfers voice/video

Question 43

Port 5060

Answer 43

PRotocol: SIP (unsecure) TCP/UDP Signaling protocol

Question 44

Port 5061

Answer 44

PRotocol: SIP (secure) TCP/UDP Signalling protocol

Question 45

Port 5900

Answer 45

Protocol: VNC TCP Virtual Network Computing