in chapter 8 we have been learning about:
lans (local area networks) which is a group of devices all conected and is all under the control of the administartive control. this would be used in a house or a little buissness
wans (wide area network) is a network that connects all the lans together.a good example of this is the internet.
bandwidth: bandwidth is the amount of data that can be sent over at a time. when data is sent over a network it is broken up in small chunks called packets.each packet has a header a header is the address where the packet is going to be dilived to, a header also contains how to put the packet back together whaen it is all sent. bandwidth is measured in bits per second.
bps – bits per second
kbps – kilo bits per second
mbps – mega bits per second
ip addressing: an ip address is a number that is used to identify a device when it is on a network. every device on a network must have a ip address to comunicate with other networks. ip addresses are divided into 5 diffrent groups these groups are:
class A – large networks such as large compaines ans some small countries
class B – medium sized networks used by universities
class C – small networks such as bt internet.
class D – special use for multicasting
class E – used for experimental testing.
there are 2 waysfor a computer to get an ip address they are:
static-typed in by a person
DHCP- dynamic host configuration protocol. the ip address is given over a network when the computer first turns on.
subnet mask: the subnet mask is used to indicate the network portion of an ip address. usually all hosts within a lan use the same subnet mask.
one of the main terms we learnt is PDNTSPA this stands for physical, datalink, network, transport, session, presentation, application. this is also known as the osi model. a easy way to remember this is please do not throw soggy pizza away.