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Transcript of Network
by Aiden Wood
Wide Area Network
A WAN is a group of networks, usually LAN, which are connected through both public and private transport to send data across large distances. Examples of Wide Area Networks include multi-campus college networks and telecommunication networks.
Local Area Network
Metropolitan Area Network
Metropolitan Area Networks are similar to WAN, except their area is contained to a single city. Metropolitan Area Networks are used to send data not commonly sent across other networks. This includes audio data and high importance data. Most MANs use fibre optic cabling to transfer information. Commonly, a MAN will span 100km or more.
What is a Network?
Two or more electronic devices, such as a computer or smartphone.
Paired by either a wireless or wire connection.
Communicate by sending data between each other.
Networks can be divided into two main types, intranet and internet networks.
Structure of a Local Area Network
Pros of a LAN Network
Cons of a LAN Network
Devices such as printers and scanners can be shared by multiple computers, making the network cost much less than usual.
Files can be stored in a central location, making data on multiple computers constantly up to data.
LAN networks can be easily managed and monitored, making devices on the network very secure.
Malicious software such as viruses can be easily spread across a network once a single device is infected.
The initial costs of setting up a LAN can be high.
Some networks, without the proper security, can be very easy to hack.
Structure of a Wide Area Network
A common example of a WAN is a company that has multiple branches. A Wide Area Network is used to keep information up to date, accessible, and secure. In this example, data is kept on a separate network. Each branch office then runs it's own LAN to connect the computers and other devices together at the single branch. Then using a WAN connection, these Local Area Networks are all connected to allow data to be sent across the whole company.
Converts a digital signal to an audio signal to then be transferred to another modem across cabling. This signal is then converted back to a digital signal.
A device with specialized software and hardware which is used to make sure data packets moving across networks arrives at the correct computer.
A Firewall is a piece of software that monitors each data packet that enters a network. The Firewall checks certain information about each packet and will either accept or reject it into the network.
Structure of a Local Area Network
A Switch is another piece of hardware used to direct data packets. While a Router is used to direct data packets to the correct network, a Switch is used to direct the data packet to the correct computer within a network itself.
A Wireless Router is a type of hardware that performs the same tasks as a Router, but sends data wirelessly via radio waves, as well as providing a hardwired connection.
Devices Commonly Connected By LAN
TV and Similar Services
Smart Phones and Tablets
Often referred to as LAN.
Commonly used in homes for personal devices.
The average LAN network connects 3 to 6 devices within a radius of 25m.
Data is moved across the network through cable connection, wireless connection, or sometimes both.
The most common device connect to a Local Area Network is personal computer. This connection is used for purposes such as internet access and wireless printing.
Servers are used in a Local Area
Network as a form of external
storage. The reasons for using
external storage can range such
as file sharing and backing up
Printers are connected to a LAN to
allow documents to be sent through wired or wireless connection from another device connected to the network.
Smart Phones and Tablets are now being connected to a LAN to allow more features such as internet access, file sharing, and printing.
Examples of WAN
The Internet can be considered to be one large WAN as it connects networks, business and personal, around the world to each other.
What is a Network
An intranet network is a group of standalone devices connected to send data between. These networks are not connected to the internet or any networks outside their proximity.
Internet connection networks are similar to an intranet network, however data is sent and received from networks outside of the area.
Example of a MAN Network
Telstra is one of the largest networks in Australia. Signal towers are found all across the country, creating a large network coverage. In the Gold Coast area alone, over 100 towers can be found.
Uses geostationary orbit satellites to broadcast a long range high quality signal that can be sent to areas unreachable by wired connections. This ability to reach new areas makes satellite internet connections highly popular in rural areas such as central Australia.
Average download speeds are between 1/10MB per second.
Average setup cost per customer is $432, including modem and satellite dish.
Point to Point Network
A Point to Point network is the simplest network topology. It is a connection of two computers connected together by a single line. This line can be anything from an Ethernet cable, fiber optic, or wireless signal.
A bus network is considered to be a group of computers each with a separate connection cable. This connection then joins onto a single bus cable. Data travels along to cables checking until the correct destination is found.
In a Star Network, each computer connects to a single switch or hub. This central device receives data from each computer then sends it to the correct destination. Because of this design, data can be sent faster than a bus network. The disadvantage to a star network is that if the hub or switch fails, the whole network stops.
A Ring Network is formed by joining a group of computers together so that each computer has two cable connections. Data travels around the network in one direction. Each computer on the network acts as a repeater as the data travels around the network. Data continues to move from computer to computer until it reaches the correct device.
In a mesh network, each device has a seperate connection to every other device inside the network. By having multiple paths for data, the network becomes highly reliable. If a cable or device in the network breaks, data can still reach it's destination by traveling across a different path.
A Tree Network is a form network where computers are setup in a hierarchy fashion. This design is created by having a single root device, which two or more devices connect too. These connecting devices are known as second level devices. Devices can continue to branch infinitely creating more and more levels. Tree networks can be very unstable as large numbers of devices can be left disconnected from a single device failure.
Daisy Chain Networking
Daisy Chaining is a simple way of connecting more computers onto a network. Daisy Chaining works by simply connecting each device onto an existing network in a point to point fashion. The data then moves from computer to computer until the correct computer is reached. If a Daisy Chain connection is connected in a ring formation, the number of transmitters and receivers can be cut in half greatly reducing cost.
Ethernet cabling was first released in 1980, then standardized in 1985. Ethernet first used coaxial cabling, but was later replaced with twisted pair cable to improve performance. Data sent across Ethernet is divided into smaller pieces called frames. Each frame is checked for data damage as it passed across the network. If damaged data is found, the frame is resent from the source. Because of the high reliability of Ethernet, it has become one of the standard cables in networking across the globe.
Fiber Optic Cable
Fiber Optic is another type of networking cable. Data is sent in the form of modulated light pulses which traveling much faster and further than other types of cable. The light is then converted to data once it arrives at the appropriate computer. As the demand for high speed data has increased internationally, the amount of research and development put into fiber optics has greatly increased. This has also lowered the price of the once expensive technology, making it more affordable for household networks. Because of the reduction in price, connections are beginning to move from Ethernet to Fiber Optic.
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