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chapter 9 security

• Internal/external threats: inside/ outide an organisation
• A virus is a code that is created delibratly to affect the infomation
• A worm is a virus that repeats itself and use the network to do this and thesends inself to other computers
• A trojian is like a worm but it looks nice to get inside your computer but it is actually bad and will affect your computer.
• A  Anti virus software is something that is designed to detect a virus
• Web security programs : JAVA , ActiveX and Javascript
• DOS- denial of service : ping of death- created to make computer crash,  Email bomb- created to make you not be able to use your email,  distrabited dos- an attack on compuiter aka zombies
• popups- designed to grab attention
• spam - email that is sent that could have harmful links in the email
• Adware is a peice of softwear that displays advertising
• spyware is a peice of softwear that lookss at everything you go on your computer.
• greyware is a program which can pertentually damage your computer
• Dos (denial of service) this is an attack on a computer which stops you having normal access to your pc.
• DDos ( distrubuted denial of service)  is like Dos but it is not only one computer that attacks you there is many.
• A social engennier is someone who is aloud acess to your computer as often as he wants to see realative infomation
• Spoofing is when something pretends to be something it is not.
• Tcp/ip is what in normally used for computers to connunicate over the internet
• A security pryimid is the order you need to protect things : 1.wireless security 2. data security 3.physical equipment 4.l0cal security policy

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.
•  

• 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

my wired router

Bandwidth BY ADAM GREENHALGH

Bandwidth is a computering turn of how quick a peice of data gets tranfererd. It measures in bits per second also knowas bps. It also represents the distance of the highest and the lowest signals. It will measure the capity there bigger the capicity you will get a better performance. However if you are trying to send some data and you do not have enough bandwidth somewhere along the way you will have to swich you data.

Here is a table to show some speeds

usb              1.1 =12mbps     2.0 =480 mbps  3.0 = 4.8 Gbs

ilink            1394a = 400 mbps     1394b = 800 mbps

ethernet    802.3 =10/100/1000 mbps

wi-fi             802.11 a = 54 b=11 g= 54 n =540

bluetooth  1=1 mbps 2= 2.1mbps

http://www.youtube.com/watch?v=6xEGuxzOCFQ

Above is a bandwidth youtube clip you can watch

Networks

In the chapter we are learning about it is all about networks. The two main types of networks are WAN and LAN. lan stands for local area network and the kind of places that you would find LAN would be a house school or a little buisness.The WAN stands for wind area network and the kind of places that you would be able to find this would be in would be the internet. There are many different ypes of networks that you can connect to these are desktop computers, laptop computers, printers, scanners and many other things. You can link a netwok to one of these things by using these cables : copper cables which use eltrical signals to transfer data, fibre optical calbling this uses glass and plastic wire which is also known as fibre to transfer there data, the last one is wireless connection which you do not need wires for and it canuse radio singnals to tranfer there data. There is also another type of network that is quite popular and this is called WLAN this stands for wireless local area network. there is another network but it is not as good this is a peer to peer network this is a network that has know administrator which means know body owns it so knowone has the power to shut it down if they wanted to.

Chapter 7 By Adam Greenhalgh

In chapter seven we was told to get infomation and learn about scanners and printers. We were asked to talk about the different types of printer such as: dot matrix, laser printer and thermal printer , we were also asked to talk about the different types of scanners such as: handheld, drum, flatbed and the all in one scanner. We discussed where the printers and scanners would be so wheather they would be in a offic or at home and what there DPI( Dot oer inch) which is also known as the quality of the printer,and the Pages per minute which measures the amount of pages that each printer prints per minute. When it came to the scanners we discussed how they scan the image onto the paper some used a laser but some would use a drum which is like a roller.

My feeling on chapter seven would be it was quite a good chapter to learn about but some times it became a big tricky and i found it hard to answer some questions but all in all i thought it was a good chapter My favourite part of the chapter would have to be when we saw the Dot matrix printer and the noise it made when it was printing because it is so old also the technology of it is nowhere near to the technology we have on our printers now.

On chapter seven i would say i put my best work into this but i think sometimes i could of wrote a bit more which in turn may get me a better grade

In chapter eight i will work just as hard but try to improve on whatever grade i get in chapter seven and also try to improve my additude to learning grade. I will also try and improve my work in class and in the end that may even improve my grade and the grade i am trying to get to is Grade c at the minumin.

pictures of printer for lexmark x3350

lexmark x3350

LEXMARK X3350

it prints at 22ppm in black

it prints at 15ppm in colour

2400 x 1500 pdi in black

4800 x 1200 pdi in colour

The average life spam of a ink jet printer is around 8 years

The cost of the cartridge in the lexmark k x3350 is £35 for both colour and black ink

The Advantages of a impact printers

• It uses inexpensive comsuables
• It also uses continuous feed papaer
• It can also make carbon copies

Disadvantages of impact printers

• very noisy
• low resoloution graphics
• it only has limited colour
• slow printing around 32-72 charcters per seconds (cps)

Step by step how to install a lexmark x3350

1. Plug in the AC power cable into the back of the computer.

2. Put the grey USb cable that in plug in the computer into the base unit.

3. When you plug the computer into the printer a little tab should come up which then you shall click yes on this tab is plug and play.

4.once we did this we installed the driver

5. After the printer was connected the we printed a test page to mmake sure it works

6.once you have done this you have insalled your Printer

Printers By Adam Greenhalgh

A printer will produce a paper copy of a electronic file.

There are two main printers these are laser printers and Inkjet printers there is also another type of printer but you raiely see them this is called the dot matrix printer. The prices of printers will be based on the capacity and the speed the speed of the inkjet printer is 2-6 ppm , ppm means pages per minute but the laser printer will print at around 8-200 ppm which is very fast and if you have a very good laser printer it will printer at around three pages per second which is amazingly fast.

The way a printer produces colour is through subtractive mixing. A laser printer only comes with certain but it will create other colour by mxing two or three. The colours it comes with are red, blue , yellow and black.  If you wanted to measure the quality of the printer it is measured in dots per inch also know as dpi. When you see a colour of green with your eye it really it will be a mix between yellow and blue not green this is why it is called subreactive mixing.

The reliability of the printer will be based on the warrenty, schelued servercing and mean time between failures (mtbf) you will only be able to use warrenty if the company who made the printer makes it with a fault so for example if you plug your printer into a laptop and it blows up they will give you a new printer because it was not your fault but if you get a hammer and break it you will not get a new printer because it was your fault it broke.

The way you connect your printer to a computer or a laptop would be one of these way you could use USB which is a very common one you could use parallel but this would only transfer one peice of infomation at a time serial would also do this or the other commom way would be wireless but you would have to have a good printer to do this.