Unit 4 - Networks Higher Target Setting

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Unit 4 - Networks Higher Target Setting Powered By Docstoc
					NAME = Unit 4 – Networking Define and explain:
Network = where 2 or more computers are connected together. Use for o File Sharing o Peripheral Sharing o E-communications o E-commerce Local Area Network – a network where computers are connected in a small geographical area i.e. one building Examples o Library, School, University Transmission Media o Copper Wire, Fibre Optic, Wireless Wide Area Network – a network connecting computers over a large geographical area i.e. across countries Examples o The Internet Transmission Media o Microwave, Fibre Optic, Satellite Network Interface Card – this piece of hardware is required to connect you computer to a network o Provides you station with a unique MAC address o May be wireless NIC connected to a HUB

How confident am I?
√ = very ?= unsure x = do not understand

How confident am I? Unit 4 – Networking Define and explain:
Advantages of Networks o Share files, peripherals, communicate with other users Hotspots = An area where wireless network signals may b be received and a computer may connect to the network Client Server Network = where all your files are stored centrally on the server and you can access the server from a number of different clients Advantages o Increased security, users can have different levels of access, flexible use of stations, central backups, can work on same document simultaneously Disadvantages o More expensive than peer to peer, if server is down, network is down Peer to Peer Network = Every workstation on a peer-topeer network has a similar status in the hierarchy, each having its own local storage devices for programs and data Advantages o Cheaper, easier to set up Operating System, Each station has its own backing storage Disadvantages o Less secure, no central storage, user must backup own data, less flexible as user must log on to the same station √ = very ?= unsure x = do not understand

How confident am I? Unit 4 – Networking Define and explain:
Mainframe Computer o a large computer system which can process large volumes of data. Can occupy a whole room and can be connected to hundreds of terminals. Supercomputer o often used for intensive mathematical calculations such as weather forecasting and aerospace design o parallel processors in order process data simultaneously Bus Topology o has each node connected to a main communications channel, called the bus o One node fails = network can still function o Bus fails = network down Star Topology o all the nodes are connected to a central node o One peripheral node fails = network can function o Central node fails = network down Ring Topology o sends signals around the network from node to node o node fails = network down o communications channel fails = network down √ = very ?= unsure x = do not understand

How confident am I? Unit 4 – Networking Define and explain:
Mesh Topology o multiple direct connections between each node o node/channel failure = network still operates o very expensive due to transmission media required Hub = a multi-port repeater that allows multiple devices to share the same network connection Switch = acts like a “smart” hub, allowing multiple nodes to communicate at the same time using MAC addresses Router = a device that acts like a bridge connecting 2 networks File Server = Stores files centrally, controls network security o Multiple processors, large amount of backing storage and RAM Print Server = allows all the clients to share a networked printer. o may incorporate a spooler and will provide a queuing system for print jobs Web Server = allows always on internet connection Intranet = a secure network where web pages can be posted, users require passwords to access Current Network Trends o Higher bandwidth o Wireless communication o Network enabled Operating Systems Mark in how well you think you are coping with each section Discuss any areas which are problematic with your teacher Read up on these sections FIRST when you are studying! √ = very ?= unsure x = do not understand


				
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posted:11/27/2009
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