unit 9 computer network networks - andrew blundell bus topology. a bus topology is a type of network...

BTEC Level 3 Unit 9 Computer Network

Level 3 Unit 9 Computer NetworksLecturer: Andrew Blundell

Networks

PC’s and NetworksComputers alone are powerful tools , connected to a network they become even more powerful.

Networks exist as a form of communication to share information (data) and resources.

• Printers (resource)

• Hard disks (data)

• Scanners (resource)

• Servers


Why NetworkWithout the presence of a network how would we transfer information (data) or share resources between computer 1 and computer 2.


Network CategoriesLAN (Local Area Network).A local area network (LAN) connects computers usually over a small local area like the home, office, school or business. A workgroup is a collection of individuals who share the same files and databases over a LAN.


Network CategoriesWAN (Wide Area Network).The biggest and best example of a wan is the internet. A WAN is any network that covers regional or national boundaries. The WAN can be described as any network that uses routers and public network links. WAN speeds can be slower as they can use public network links.


Network CategoriesPAN (Personal Area network).A PAN, is a local network designed to transmit data between personal computing devices (PCs), personal digital assistants (PDAs) and smartphones. Gaming devices, like a game console system, may also be set up on a PAN.

Note: A PAN can be hooked up to another network or the Internet, if needed.


TopologiesStar Topology.A star topology is one of the most common network setups. In this arrangement, every node connects to a central hub, switch or computer; the hub acting as a server and the peripheral devices as clients. A major disadvantage of this network topology is that if the central hub fails, all of the connected devices are disconnected.


TopologiesRing Topology.A ring topology is a computer network configuration where the devices are connected to each other in a circular shape. Each packet is sent around the ring until it reaches its final destination. Today, the ring topology is seldom used.


TopologiesBus Topology.A bus topology is a type of network setup where each computer and network device are connected to a single cable or backbone. Bus networks are useful in small networks (like those setup in a small offices) and have the advantage of using less cable. Their main disadvantage is that if any segment of the network fails, all transmissions do as well.


TopologiesTree Topology.A tree topology is one of the most common network setups. It is essentially a combination of bus topology and star topology. The nodes of bus topology are replaced with standalone star topology networks. This results in both disadvantages of bus topology and advantages of star topology.


TopologiesMesh Topology.A network setup where each computer and network device is interconnected with one another, allowing for most transmissions to be distributed, even if one of the connections go down. This topology is not commonly used for most computer networks as it is difficult and expensive to have redundant connection to every computer.


Peer to Peer NetworkA network that does not have a central computer or dedicated server.

• Each user is responsible for local backup

• Security is minimal

• Limited numbers of computers

• Security is the responsibly of each user

• Difficult to navigate


Client – Server NetworkA network setup that utilizes both servers and clients. For example, a network that utilizes a DNS server is an example of a client/server network. Most client/server networks are the networks you would find in a corporate or business environment.


unit 9 computer network networks - andrew blundell bus topology. a bus topology is a type of network...

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