Network Topologies, protocols and layers 1.5 v2

Network Topologies, protocols and layers 1.5 v2

1. most computers and devices are connected together via networks, this allows for new opportunities and advantages.

   • star network
     • advantages
       • if cable fails it will only affect one workstation
       • more computers can be added without disruption
       • easy to identify problems in the network
     • disadvantages
       • requires more cable
       • failure of the central unit will cause the whole network from working
   • FTP
     • File Transfer Protocol
     • used to exchange files between computers on a network

2. a computer network is a number of computers linked together to allow them to share resources.

   • networked computers can share hardware, software and data
   • these networks are used in schools and buisness

3. key words:

   • topology- the way in which computers are interrelated or arranged
   • mesh network- a local network topology in which infrastructure nodes connect directly to as many other nodes as possible and co operate with each other to efficiently route data
   • star network- a data or communication network in which all the nodes are independently connected to one central unit
   • WiFi- a facility allowing many devices to connect to the internet or communicate with one another wirelessly
   • encryption- the process of converting information or data into a code.
   • ethernet- a system for connecting a number of computer systems to form a local area network

4. ethernet

   • stable connection
   • reduced chance of being hacked
   • more secure
   • faster traffic speed
   • good quality signal

5. wifi

   • cheap to set up
   • more vunerable to hacking
   • signal will reduce through walls or doors etc
   • can connect multiple devices without the need of extra hardware
   • interference can occur
   • encryption can be used to prevent unknown users stealing your packets

6. encryption

   • a key is used to decrypt this data
   • https shows that the URL is secure and encrypted
   • encryption keeps your information safe and secure

7. key words:

   • IP addressing-a unique string of numbers separated by full stops that identifies each computer using the Internet Protocol to communicate over a network.
   • MAC address- (media access control) a unique identifier assigned to network interfaces for communications at the data link layer of a network segment.
   • protocols- a set of rules or instructions that they are set to follow

8. key words:

   • layers- packets travel through layers where protocols control them

9. packet switching

   • a big piece of data broken down into packets to be sent to another address
   • each packet is given a header this header contains the IP address of the network and device it is sent to
     • this data is used to reassemble the data
   • if not all of the packets arrive an error message is sent to the sender and if another packet doesn't arrive then the router deletes the packets

10. TCP/IP

    • Transmission Control Protocol/Internet Protocol, which is a set of networking protocols that allows two or more computers to communicate