brads blog

in chapter 9 we have been talking about computer saftey and all about viruses.

internal threats – cause a melicious threat or a accidental threat

external threats – ouside users can atatck.

a worm is a self repulactating virus that duplicates itself when it  gets on a network.

a trojan horse is known for its way to get inot the network. it pretends that it is something good and it is reaaly something bad.

Adware, spyware, and grayware are usually installed on a computer without the knowledge of the user. These programs collect information stored on the computer

Phishing is a form of social engineering where the attacker pretends to represent a legitimate outside organization, such as a bank. A potential victim is contacted via e-mail. The attacker might ask for verification of information, such as a password or username, to supposedly prevent some terrible consequence from occurring

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.

In chapter 7 we was told to learn and research about scanners and printers. we was also told to talk about different types of printers such as laser printer, dot matrix and thermal printers.we were also told to talk about different types of scanners such as handheld, drum,flatbed and and the all in 1 scanner.we also learnt how printers and scanners were measured in. they are measured in DPI. ( dots per inch)

My feeling on chapter 7 is that it is a good chapter and has a lot of practical in it, but some of the parts of it was hard becasue some of the questions were hard to answer.

in chapter 7 i think that i have worked hard but i think that i could of wrote some more on some of the other posts i have done.

in chapter 8 i will work really hard to try and improve my grade that i got in chapter7. i will try and at het at leat a C grade next module.this is how the laser printer works.

In chapter 6 we have been reading about the difference between laptops, smart phones and desktops. In this summary i will explain the uses of laptops and desktops and which one i think is the better one. 

Laptops: 

Common uses of a laptop is for when you go to school it is something you can carry around with you easily because it is really light.You can play games on the move,watching movies on the move and sending and receiving emails in a public place.They support hot-swappable drives and peripherals.Because many portable devices change rapidly in design and functionality, portable devices are often more expensive to repair than to replace.the only problem with a laptop is that you have to pay for extra things like speakers if you want it louder and a mouse if you think it is to hard to use the touch pad.you  will also have to keep cleaning it because laptops have a small ventilation so you need to keep cleaning it so it doesn’t over heat. 

Some of the difference between laptops and desktops are that the size of the motherboard. 

This is the size of the mother board of a laptop: 

Smart phones and pdas: 

Smart phones and pda’s are basically a phone but you cant text or call on them a example of one of these is the ipod touch it has the Internet and music and basically everything that  a phone does except you cant call or text.The concept of the PDA has existed since the 1970s. The earliest models were computerized personal organizers designed to have a touch screen or a keyboard. Today, some models have both a touch screen and a keyboard. 

Common uses for a desktop computer is if you want a computer that just is for storing all of your work so that it wont get lost, stolen and they don’t really break often. Desktops have internal bays that support 5.25″ and 3.5″ drives. 

This is the size of the motherboard of a desktop computer: 

History: 

In 1979 the first laptop was made it cost £2,000 and now it would cost about £500,000 which is half a million pound.The average smart phone would cost about £150 +. 

We also learnt about trouble shooting and how to get rid of it on your computer. first you have to find out what the customer done. Then see if you can fix it. Then gather information from the computer and see if you can fix it. 

In conclusion if i had to pick out of the laptop, desktop, pda or smart phone i would pick the laptop because it is easy to move around with if you did have to charge it it is just  1 cable. It is faster then a normal computer, and it has more memory  then a pda and a smart phone phone so i would pick the laptop as my first choice. Then my second choice would be a smart phone it is cheaper and a lot more easier to move around with. It doesn’t have as much battery life and as much memory but it is a lot more easier to use.The one that i wouldn’t recommend to anyone is the desktop computer because it is really big and is really hard to move about and if it breaks the parts to get it fixed will cost a lot.   

This is a picture of a few of the smart phones: 

The iphone 4g (stands for 4 generation) is the next i phone relesed. it is ment to be realsed beetwen may and july. it will have a removable battery,glowing aplle logo on the back, 5 mega pixel camera, 64gb nand flash memory.dual core processor and more ram, multi tasking, camera on the front for video chat, gps built in.

There are a few networks working on building a 4G network. T-mobile would be a likely carrier since they are GSM already. Sprint has a 4G network already, AT&T and Verizon Wireless are in the beginning stages.

the difrence between laptops and desktop componets are that the components in a laptops are smaller in size but same amount of mass .The desktop is bigger then the laptop. The base unit is bigger then the laptop.the laptop is portable and the desktop isn’t.the laptop is wireless and the desktop needs lots of  wires connected to it.

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