Websites and Browsers

1.) A website is a location, connected to the internet, that manages and maintains one or more web pages. Examples of famous websites are Youtube, Facebook, Twitter, Wikipedia, E-Bay and Amazon.

2.) A web browser, or simply a browser, is a piece of software application that searches for, retrieves, and presents information, from the internet. Examples are Google Chrome, Internet Explorer, Mozilla Firefox, Safari and Opera.

3.) There are many features of a web browser. Web browsers have something called tabs, which are different windows or websites that can be opened at the same time. Another main feature of web browsers are the favorites bar, which is a tab that you can add websites you want to visit quickly. Another main feature is the URL bar at the top of the screen. This displays the URL that you are currently on and you can use it to type in URLs.

Data Centres and i.p

1.) A data centre is a huge group of networked computer servers. Data centres are normally used by large companies for the purpose of storing, processing or distribution of big amounts of data that would be hard of single computer servers to handle. An example is the technology company Samsung's data centre, based in South Korea, which recently crashed for a brief period due to a fire.

2.) a) 60 Hudson Street, once known as the Western Union Building, is a large telecommunications building that is spread out over an entire block in New York. It was formerly used as a telegraph hub, but is now used as a colocation centre where over 100 companies have separate offices and can exchange data.

b.) Telehouse is a major colocation (data centre), IT services and managed services company that is based in Docklands in London, which was founded in 1988.

3.) A large data centre in another European country is the new Dublin Data Centre in Dublin, Ireland. It will power much of Microsoft's global cloud computing operation, but will use far less energy and water than a regular data centre.

4.) Data centres serve the purpose of storing data for large companies who's data is too great to be kept in a single server room or a single server. They also serve as units that can be used to transport or used to access data.

5.) Because data centres are made up from hundreds of different servers, and are simply extremely large servers, they work like a server. Computers allow access to data centres, and the computer searches the data centre for the piece of data you need and then delivers it.

6.) Data centres are quite safe. IT workers patrol the area making sure that nothing goes wrong, and to prevent overheating, data centres are cooled frequently. Data centres are also equipped with backup power supplies, meaning that if there is a large fail in the mains, the data centre can keep running. However, as expected, with all that electricity and the fact that data centres often keep cooling water, fires are a dangerous possibility, as shown in the recent Samsung data centre fire, which took about Samsung electronics worldwide.

7.) Finding your i.p address is easy. If you go onto settings and onto the wifi setting on your computer, you can see your i.p address. Sometimes, you are given a card with your broadband information on it, and this often has your i.p address on it.

8.) My house and components are not connected to a LAN, so I cannot find my private i.p address. I.p addresses connect a LAN server to the rest of the internet, and connect LANs to other LANs to form a WAN.

9.) There is a clear cut difference between Dynamic ip addresses and Static i.p addresses. Static addresses never change, but Dynamic addresses are assigned by the network when a device connects, meaning they change. Most devices use Dynamic.

10.) Facebook = 204.15.20.0
Twitter = 128.242.240.244
Youtube = 208.65.153.238

11.) There are many reasons why people would want to track people using i.p addresses. If a criminal is on the run and is using a computer or phone to connect to a network, the police can use their i.p address to track them down. Similarly, if someone goes missing, you could use their dynamic i.p address to try and find them.

Network Security

1.) There are many different kinds of Network security. These kinds of security all protect a different area of the network or the computer, or sometimes different components of the computer. They include, but are not limited to: data security, access security and physical security.

2.)a) Data security is security that protects data, e.g a database from malicious viruses and users who may steal or spread private data.

b) Access security is the restriction of users to access or open a certain component of the computer or network. This could be anything, from one website or a set of websites, to a file or document.

c) Physical security is security that is out of the computer or network that protects the physical hardware of a computer from being damaged or stolen by malicious people. These can be something simple like a locked door, or something more complex like a series of cameras.

3.) There are many examples of when these kinds of security could be used in the school network. The most obvious one is physical security. The door could be locked that leads into an IT room, so people with malicious intentions cannot come in and vandalize the computers. Access security can be used to prevent people getting onto disturbing or inappropriate websites, e.g screamer websites. Lots of students store lots of files on the computers and data security will help them keep it safe.

Networking Homework

1.) A computer network is a set of computers connected together for sharing resources.


2.) a.) We have been looking at LAN (Local Area Network

b.) And WAN (Wide area Network

3.) Internet = WAN
International bank = WAN
Secondary school = LAN
Local Library = LAN
University Campus = LAN
Asda Supermarket = WAN

4.)a) Project work can be shared
b)Teachers can check on children's work
c) Teachers can share work between each other

5.)a) Someone could hack into it and steal people's work
b) Disturbing material could easily be shipped around
c) It's harder to connect to other schools

6.) Mesh topology - Every computer is connected to each other and to the server
Bus topology - Only one computer is connected to the server
Star topology - Each computer is separately connected to the server
Line topology - Each computer is connected to the one in front of it.

Networking

1.) LAN stands for Local Area Network. It is a small network of computers that are all connected to a server. LANs are usually confined to a small area, such as a building.

2.) WAN stands for Wide Area Network. It is a network that spans over a large distance. They t
typically consist of multiple LANS.

3.) A network topology is how the different parts of a network (Clients, router etc) are arranged connected. For example, a mesh network is when all clients are directly connected to the server.

4.) Mobile network is different to regular ones. An example is 4G, or the smaller 3G network.