Networking Concepts

i) OSI model

• Open system interconnect
• consist of layers that describes how networks communicates with each other
• The seven layers are

1. Physical
2. Data Link
3. Network
4. Transport
5. Session
6. Presentation
7. Application

• each layer have it's own responsiblites
• this model abstracts the complex process of data transfer over the network

resources to learn link one : https://youtu.be/7IS7gigunyI

ii) Different Protocols

1. TCP/ip a) HTTP b) SMTP c) POP3 d) FTP e) SSH f) Telnet

2. UDP

iii) HTTP / Cookies

• HTTP , Hyper Text Transfer Protocol
• Request, Response structure
• Client sends a request to an ip addr or a domain name with the specified file or resource, the Server then in response sends the file to the client
• Since http is a state less protocol, to store client information over the session we use cookies.
• Every modern website uses cookies to, there is s thing called third party cookies that is stored not from the domain you are currently on but from another domain which you have never visited