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Network Protocols - Coggle Diagram
Network Protocols
What is HTTP?
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The protocol allows a browser to request individual files from a web server e.g. text, images, javascript etc.
Once the files have been received, they are rendered into a webpage.
HTTP secure – this protocol works like HTTP but it encrypts web page data before it is sent from the browser or web server.
This ensures that information such as user names, passwords, bank details etc, are transmitted securely.
What is FTP?
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It can also be used to share files. However, with the growth of cloud storage, this is less common nowadays.
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What is a protocol?
A "Protocol" is a set of agreed-upon rules for how something must happen. Computer systems around the world are able to share information with each other because they expect the same protocols and are able to expect data to transfer in a certain way.
Very many aspects of our own lives follow protocols. Consider protocols for: eating, crossing roads, asking questions, shaking hands & driving.
What is TCP?
TCP – Transmission Control Protocol. IP – Internet Protocol. TCP / IP are two separate protocols which work together to allow computers to send data to other devices across a network or the internet. TCP cuts messages into packets of data for sending across the internet. TCP reassembles the message at the destination by putting the packets of data into order. TCP gives each packet a number so they can be put in the correct order on delivery. TCP can identify errors & missing packets. TCP can request redelivery of individual packets. IP ensures that each data packet is given a destination address and a sender address. IP only reads data packets if it is the intended destination for that packet. If data packets are sent using a hub , then all nodes will receive all packets of data . IP will only read the packets of data that are meant for it . IP ignores packets of data that are not meant for that node .TCP and IP must be used together . TCP and IP rely on each other for different functions . Only when both are combined can data be sent across a network or the Internet .A packet is a small group of bits of data that are sent together . Packets contain source address , destination address and packet information .A packet could be damaged or go missing when it is being delivered to a node . TCP can ask for a packet to be sent again .TCP adds a sequence number to each packet so that it can be put into the correct order when it arrives .
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