Ports-and-Services.md

Ports and Services

Different services run at each port and capture data and requests coming at each other

• Hardware Ports: USB, Audio, HDMT

• Software Ports: Provide gateway to get inside a system and internet with software - Each port takes us to different application or service

• A data packet contains two types of information:

1. IP and Port of the Server
2. IP and Port of the Client

• Some commonly used ports and services:

Port	Service
20/21	FTP(File Transfer Protocol
22	Secure Shell(SSH)
23	TelNet
25	SMTP( Simple Mail Transfer Protocol
53	DNS(Domain Name Service)
80	HTTP(Hyper Text Transfer Protocol)
443	HTTPS(Hyper Text Transfer Protocol Secure)
123	Network Time Protocol
161	Simple Network Management Protocol

• For Client:

• Port on sending device: local port(client)

• Port on receiving device: remote port(server)

• For Server:

• Port on sending side: local port(server)

• Port on receiving side: remote port(client)