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chapter 8ight Notes =)(=

• In chapter eight we have been learning about networking. In every network it is a colletion of hosts that it connected by network devices.
• The are many different types of networks but the main two are LAN aka local area network and also WAN which is a wide area network. The LAN would be found in a school but the WAN is just the interent its self. Below to your left you will be able to see a WAN and LAN network as you can see LAN netowrk are much smaller than WAN and you can see how the LAN are using the school computers but using the WAN ( internet) to use them.
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• We also learned about IP adress an IP adress is a number that is used to indentify the computer that is using the network. To your right you can see the IP adress that also has subnet mask on this.

•  A key thing to the computer is the TCP this makes sure that when you send something to another computer it will send something back to make sure it has been sent.
•  One of the key terms we learnt was the PDTSPA this stands for physicial, data link , network , transport , session , presentation and application. This is also known as the OSI model.
• A subnet mask which you can see on the picture to your right is something that allows the end device to decide what network for the IP Adress
• Bandwidth is something that measures the amount of data that can be transfered in a certain amonunt of time it is measured in three different type is is measured in: Bps = bits per second  , Kbps = kilobits per second and Mbps = megabits per second. which hold the most amount of data follwed by Kbps then Bps. Below is a picture showing some of the speed of the bandwidth.
• The are lots of devices that can be connected to the network such as: laptops, desktop computers , smartphones, scanners and printers.
• If you want to connect to the internet through a wired connection a network interface connection is needed, once you have connected the NIC cable you may have to update a few things on your computer for the internet to work properly.
• A modem is a device that tranfers data between computers using anolog signals or some may use a telephone line. The external ports from the modem is USB.
• Another way of communication is from the power line connectionthis is only used to send and revcice data. Other ways it is known as is : power line networking , mains communication and power line telecoms.
• broadband is a netowork that is used to send and recive lots of singnals using one cable an example of this would be a a television.
• DHCP is a shorter version for Dynamic host configeration protocal. This is a peice of softwear that allows you to connect to other network devicies.

      There are five main IP adresses that the server can connect to they are:

• class A- large networks implemeted  by large companies and some countries
• class B-  Meduim size networks implemeted by universties.
• Class C- small networks implemeted by ISP for customer subsciptions
• Class D- specical use for multitasking
•  Class E - use for experimental teasting