Ports

Question 1

TCP Port 22

Answer 1

SSH – Secure Shell, used for secure logins, file transfers, and port forwarding.

Question 2

TCP Port 23

Answer 2

Telnet – Used for remote command-line access (insecure).

Question 3

TCP Port 25

Answer 3

SMTP – Simple Mail Transfer Protocol, used for sending emails.

Question 4

TCP Port 53

Answer 4

DNS – Domain Name System, used for resolving domain names to IP addresses.

Question 5

TCP Port 80

Answer 5

HTTP – Used for unencrypted web traffic.

Question 6

TCP Port 110

Answer 6

POP3 – Post Office Protocol, used for retrieving emails.

Question 7

TCP Port 111

Answer 7

RPC – Remote Procedure Call, used for executing commands on remote systems.

Question 8

TCP Port 135

Answer 8

RPC – Microsoft RPC services for Windows DCOM communication.

Question 9

TCP Port 139

Answer 9

NetBIOS – Used for Windows file and printer sharing.

Question 10

TCP Port 143

Answer 10

IMAP – Internet Message Access Protocol, used for retrieving emails.

Question 11

TCP Port 443

Answer 11

HTTPS – Secure HTTP for encrypted web traffic.

Question 12

TCP Port 445

Answer 12

SMB – Server Message Block, used for file sharing on Windows networks.

Question 13

TCP Port 993

Answer 13

IMAPS – Secure version of IMAP for encrypted email retrieval.

Question 14

TCP Port 995

Answer 14

POP3S – Secure version of POP3 for encrypted email retrieval.

Question 15

TCP Port 1723

Answer 15

PPTP – Point-to-Point Tunneling Protocol for VPNs.

Question 16

TCP Port 3306

Answer 16

MySQL – Used for MySQL database connections.

Question 17

TCP Port 3389

Answer 17

RDP – Remote Desktop Protocol for remote access to Windows systems.

Question 18

TCP Port 5900

Answer 18

VNC – Virtual Network Computing, used for remote desktop access.

Question 19

TCP Port 8080

Answer 19

HTTP Proxy – Common alternative HTTP port, often used for proxies or web servers.

Question 20

UDP Port 53

Answer 20

DNS – Domain Name System, used for resolving domain names to IP addresses.

Question 21

UDP Port 67

Answer 21

DHCP – Dynamic Host Configuration Protocol (server to client).

Question 22

UDP Port 68

Answer 22

DHCP – Dynamic Host Configuration Protocol (client to server).

Question 23

UDP Port 69

Answer 23

TFTP – Trivial File Transfer Protocol, used for simple file transfers.

Question 24

UDP Port 123

Answer 24

NTP – Network Time Protocol, used for clock synchronization.

Question 25

UDP Port 135

Answer 25

RPC – Microsoft RPC services for Windows DCOM communication.

Question 26

UDP Port 137

Answer 26

NetBIOS – Name service for resolving NetBIOS names to IP addresses.

Question 27

UDP Port 138

Answer 27

NetBIOS – Datagram service for network communication.

Question 28

UDP Port 139

Answer 28

NetBIOS – Session service for network file and printer sharing.

Question 29

UDP Port 161

Answer 29

SNMP – Simple Network Management Protocol, used for network management.

Question 30

UDP Port 162

Answer 30

SNMP Trap – Used for sending SNMP trap notifications.

Question 31

UDP Port 445

Answer 31

SMB – Server Message Block, used for file sharing on Windows networks.

Question 32

UDP Port 500

Answer 32

IKE – Internet Key Exchange for VPNs.

Question 33

UDP Port 514

Answer 33

Syslog – Used for forwarding log messages.

Question 34

UDP Port 520

Answer 34

RIP – Routing Information Protocol, used for routing updates.

Question 35

UDP Port 631

Answer 35

IPP – Internet Printing Protocol, used for network printing.

Question 36

UDP Port 1434

Answer 36

Microsoft SQL Server – Used for SQL Server browser service.

Question 37

UDP Port 1900

Answer 37

UPnP – Universal Plug and Play, used for device discovery.

Question 38

UDP Port 4500

Answer 38

IKE NAT-T – Internet Key Exchange for VPN NAT traversal.

Question 39

TCP Port 21

Answer 39

FTP – File Transfer Protocol, used for transferring files between a client and a server (control connection).

Question 40

What are registered ports?

Answer 40

Ports ranging from 1024 to 49151 and assigned by IANA for specific services or applications. They are commonly used by software vendors for proprietary applications.

Question 41

What are known ports?

Answer 41

Known ports, also called well-known ports, range from 0 to 1023 and are reserved by IANA for core network services and protocols, such as HTTP (80), FTP (21), and SSH (22).