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CS-Networks, Hosting, Transmission Media, Network Performance, Encryption,…

- - - - Dis: if 1 node shuts down, the network will collapse. hardware is more expensive
- - - - Often used in: mobile/wearable devices like smartphones/watches, headphones, etc
    - - Often used in the home: routers, desktops, laptops, smartphones, etc
      - to set up Wi-Fi you need a Wireless Access Point (WAP) device
        
        The WAP is a switch that allows devices to connect wirelessly
        
        usually connects to a router via wired network
- - - - built into the motherboard
      - exist for both wired and wireless connections
    - - each networked device has a unique MAC address
- - - - E.G. businesses with offices in 3 different countires
    - - The Cloud
        
        acts as an extension of a traditional client-server network where user files are stored centrally
        
        term used services delivered over the internet, E.G., google drive, dropbox, onedrive
        
        ADV: it can be accessed from any device with internet connection, all data is backeed up
        
        DIS: requires internet connection, data is owned by a third party company
      - DNS
        
        stands for Domain Name System
        
        a DNS server translates a web page in to an IP address
        
        there are 13 DNS root servers worldwide
        
        DNS servers follow a heirarchy
        
        lower level DNS servers are owned by Internet service providers (ISPs)
        
        An IP address stands for Internet Protocol address
        
        each device has a unique IP address but there is also a public IP address for devices using the same network
        
        Google.co.uk is an example of a domain name
      - WWW aka The World Wide Web makes use of the internet; it makes use of HTTP to send and receive data
      - Packet switching
        
        data being sent is split into packets each containing the same number of bytes
        
        each packet is given a header which will contain thins including: the IP address of sender, The destination IP address and a sequence number
        
        the packets are sent via different routes depending on en-route traffic. When they get to the destination, they will be re-assembled in order.
- - - - Client-Server Relationship
        
        server's role is to wait for a request by the client, process the request and then respond/send data to the client
        
        Pros: Easier to- keep track of files, perfrom back ups, install and update software, manage network security. sevrers are very reliable and are always on
        
        Cons: expesnive to set up and maintain, if server goes down all clients lose acess to work, risk of overload
  - - - alll devices connect to each other without a server
    - - can be used at home to share files between devices or to connect a device to a printer
- - - - 4 layers: Application, Transport, Internet, Link
        
        Transport: Creates a connection between devices on a network. Divides data into packets and reassembles data at destination, resends lost messages uses TCP
        
        Application: an application (web browser, etc.) creates data to be sent
        
        Internet: responsible for routing packets. Uses IP
        
        Link: physical cabling. E.G., Fibre optics, Ethernet. Uses Ethernet Protocol
      - Adv: self contained, provides interoperability