A Network is created when more than one device has been combined together. A network can also be known as a small collection of computers that are connected within a building (EX: School, Home or Business) or a wide collection of computers that are around the world.
- Communication- it is easy and often free to communicate using email, text messages, voice calls and video calls
- Roaming- if information is stored on a network, it means users are not fixed to one place. They can use computers anywhere in the world to access their information.
- Sharing Information- It is easy to share files and information over a network. Music and video files, for instance, can be stored on one device that can be shared across many computers, so every computer does not need to fill hard drives with files.
- Sharing Resources- it is easy to share resources such as printers. Twenty computers in a room could share one printer over an entire network.
- Sharing Software- it is possible to stream software using these web applications. This is avoiding the need to download and store the whole software file.
- Dependence- users that are relying on a network might be stuck without having much access to it
- Hacking- Many criminal hackers will try to break into the networks to gain personal information and peoples banking details. This is not possible on a stand-alone computer without having to break into the room, but is much easier with a network.
- Hardware- routers, network cards and other network hardware is required to set up a network. At home, this is very easy to set up a wireless network without technical expertise. However, a very complicated network in a school or an office would require professional expertise.
- Viruses- networks make it easier to share viruses and other malware. They can quickly spread and damage files on many computers via a network.
Network Interface Card (NIC)- Any computer that is to be connected to a network. It needs to have an NIC. Many modern computers will already have the NIC built into the motherboard, but some computers may require an extra expansion card (small circuitboard).
Network Cable- In order to connect many different devices to create a network, cables are required. Many cables are still used in most networks, rather than using the wireless, since they can carry a lot more data per second, and this ensures that it is more secure (less open to hacking).
Hub- A device that can connect to a number of computers to create a LAN. The hub is mainly used at the centre of a start network, or part of a hybrid network. The hub has many cables plugged in from every computer.
Switch- This is similar to a hub since it also connects many computers to create a LAN. The switch is also used at the centre of a star network, or part of a hybrid network. This will also contain cables plugged in from each computer. Switches are much more intelligent than Hubs since they check message addresses and send it to that specific computer. This is much more secure than the Hubs, but will make it slightly more expensive.
Router- It is a network device that connects together two or more networks. A very common use of the router is that it can join a home or a business network (LAN) to the internet (WAN). The router will have an internet cable plugged into it, as well as having cables that the computers are connected on the LAN. The LAN connection could be wireless, creating a wireless router.
Proxy Server- It is a computer setup which is used to share a resource, usually an internet connection. Many other computers could request a web page via the proxy server. This proxy server will then be able to get the page using this internet connection, and it will pass it back to the computer that had requested it. Proxy servers are more commonly used instead of this router since additional software could get easily installed such as an anti-virus or web filtering.
Bridge- This is a network device that can link two different parts of a LAN together. A router is usually linked to a LAN to a WAN (The Internet), and a bridge can independently link various parts of a LAN so they manage to act as a single LAN.
Firewall- A firewall is a device, or a piece of software that can be placed between your computer and the rest of the network (where the hackers are located). If you want to protect your LAN, you could place a firewall between the LAN and that internet connection. The job of the firewall is to block unauthorized connections that have been made to your computer or LAN. Normal would pass through the firewall, such as emails and web pages, but other data will get blocked.
Modem- A modem contains a DAC and an ADC. The DAC is required in the modem so the digital computer will be able to send data down an analogue telephone line (it converts digital data into noises which is exactly what the telephone line is designed to carry.) The ADC in the modem is required so that the analogue signals (noise) is exactly what the telephone has been designed to carry.
- The internet is a global network of computers
- A Computer
What happens when you try to access a particular website?
- You access a website and then your computer will ask permission and the server either denies you access or gives you access, and if it says yes you can see that website.
|| Computers that are connected together in a site.
|| Local Area Network.
|| Wide Area Network.
|| The process of sending digital or analog data over a communication medium to one or more computing, network, communication or electronic devices.
|| Internet Service Provider, you need this to access the interwebs.
|| Different on every computer and cannot be changed.
|| Every single device has their own different IP Address.
|| Contains IP Address and other details, stands for Uniform Resource Locator.
|| Transfers web pages to client.
|| Secure web address (encrypted.)