Network Topologies

Network Topologies

1. star network

   • consists of one central hub
   • every host is connected to a central hub
   • one of the most common network topologies
   • if control device fails, the whole network fails

2. mesh network

   • local network topology
   • connected to eachother
   • connected to the node the share the most data with

3. A computer network is a number of computers linked together to allow them to share resources. Networked computers can share hardware, software and data.

4. wifi

   • wireless frequency
     • radio waves are used to transmit data packets without the need for wires.
   • slower and more vunerable to an attack
   • no need for cabling and networks
   • set up in remote locations such as vehicles, parks or planes

5. encryption

   • scrambling data with a key code which makes no sense
   • on an open/public wifi encryption is used is stop people getting packets of data from other users
   • in order to read data the user is required to enter the key
   • makes it hard for hackers to encrypt the data
   • When you are using a secure site for example your bank, or purchasing on Amazon, encryption applied to keep your details safe:
     • The encryption method used is called 'SSL' (Secure Socket Layer).
     • A tiny padlock appears in your browser window, usually on the left hand side of the address bar and the website address starts with HTTPS://

6. ip address

   • A unique string of numbers separated by full stops that identifies each computer using the Internet Protocol to communicate over a network.
   • Data travelling on a Network are sent as packets .
   • Each device on the internet has a unique IP address which is sent with the packets to identify which computer to send the data to.
   • The address is broken down into four numbers which can represent a number between 0 and 255 separated by a full stop.
   • ip classes
     • IP addresses also have different classes which identify the class of Network that the user is on.
     • This indicates the number of total possible users and the purpose of the network

7. protocols

   • TCP/IP - (Transmission control protocol/ internet protocol)
   • HTTPS - (Hyper text transfer protocol secure)
   • IMAP - (Internet message access protocol)
   • HTTP - (Hyper text transfer protocol)
   • SMTP - (simple mail transfer protocol)
   • FTP - (File transfer protocol)
   • POP - (Post office protocol)

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