DevOps
What is computer Network?
A computer network is a system that connects multiple computers and devices to share resources and information.
What is client and server?
- Client:- A client is a program that run on the local computer and requesting service from server.
- Server:- A server is a program that run on remote computer and send response to client.
## Protocols: Protocols are some set of rule how data will send over network.
- TCP
- UDP
- HTTP
- DHCP
- SMTP
- POP3 & IMAC
- SSH
- VNC
Ports
A port is a virtual point where network connections start and end. Ports are software-based and managed by a computer’s operating system.
| Port Number | Process | Uses |
|---|---|---|
| 80 | HTTP | |
| 443 | HTTPs | |
| 3306 | MySQl |
IP Address
IP is a protocol or set of rules for routing and addressing packets of data so they can reach to the correct destination.
Structure of Network
OSI Model (Open system Interconnection):
OSI model is a conceptual framework that divices network communications into seven layers.
TCP/IP Model:
DNS (Domain Name system):
Domain Name System (DNS) is a distributed database that translates domain names into IP addresses.
UDP (User Datagram Protocol):
The User Datagram Protocol (UDP) is a communication protocol primarily used for fast, connectionless transmission of data over networks.
- UDP header fields include:
- Source port
- Destination port
- Packet length (header and data)
- checksum
TCP (Trasmission control protocol):
TCP is a transport layer and connection oriented protocol that means its establish the connection befor start communication between devices.