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1.3 Computer networks, connections and protocols, https://www.youtube…

- - - - Links- the interface on which wultiple devices can communicate. such as a cable or wireless.
      - Client- A client is a piece of computer hardware/software that accesses a service made available by a server.
      - Node- A device connected to a network via a link.
      - Server- A server is an instance of a computer program that accepts and responds to requests made by another program, known as a client.
      - Network- A collection of computer systems that are linked together and can share data.
- - - - TCP(Transmission Control Protocol)
        
        Prepares messages for transmission and also reassembles any messages that are recieved('packet switching').
        - To send data over a network the TCP:
        -Divides the message into smaller data packets.
        -Adds a sequence number to each packet so that it can be reassembled after delivery
        -Adds error correction informaton so that errors can be spotted and fixed.
        - To recieve data over a network the TCP:
      - IP(Internet Prtocol)
        
        When data is sent over a network, IP is responsible for adding the destionation address to each data packet adn adding its own address(source address) to indicate where the packet originated from.
        
        When data is recieved over a network, the IP is responsible for accepting data packets which have its own address attached, but ignoring all others.
    - - HTTPs- works like HTTP, but encrypts the data- secure
      - FTP(File Transfer Protocol)- Transfers files between client & server(or vice versa)
      - HTTP(Hyper Text Transfer Protocol)- the set of rules used for sending and receiving web pages.