Why should we use a network or LAN? - Networking allows file sharing to allow people to work collaboratively; you can share hardware; the internet connection can be shared; it is easier to install and maintain software; user accounts and authentication can be held centrally and logged on from any computer on the network., What does WAN stand for and describe its main features? - Wide Area network, it connects computers together for communication over a large geographical area, this usually involves connecting many LAN's together., What does LAN stand for and describe its main features.? - Local Area network, it connects computers together for communication over a small geographical or a single site., What is the biggest WAN of all? - The internet., What factors effect the performance of a network? - The bandwidth, the number of users using this bandwidth, the nature of the network eg wired or wireless. The transmission medium e.g. fibre optics or copper cable. The topology being used e.g. bus or star?, What is bandwidth? - The amount of data that can be transferred in a given time., What are the advantages and disadvantages of wired versus wireless networks? - They are faster and more reliable as they are not effected to signal interference, but they are less convenient as they are limited by needing a wire connection and extra cabling can be expensive., List some hardware needed to create a LAN? - Routers, network interface cards (NIC); fibre optics; switches; ethernet cables, What does a router do? - They are responsible for transmitting data between networks, they direct packets of data in the most efficient route from sender to receiver., What does NIC stand for and why is it needed? - Network interface card, it allows a computer to physically connect onto the network., What hardware do you need to connect to a wireless network? - WAP wireless access point, it is usually a dedicated piece of hardware found in the router., What do we call the bands within bands used in Wi-Fi? - Channels, What is the key difference in hardware between peer-to-peer and client-server? - Peer-to-peer doesn't require a server, Describe the characteristics of a peer-to-peer network - All devices are equal, files are stored and shared on individual computers., What are the pros and cons of a peer-to-peer network - It doesn't require a server and so is relatively cheap and doesn't require a lot of technical expertise to maintain. It does mean that there is no centralised management and back-ups and security updates are not available. If a file is needed and the machine it is stored on is not switched on or broken, you cannot access it., Describe the client-server relationship. - Requires workstations to be connected via a switch and server. Clients makes requests to the server and this processes the request and responds to it. The server stores the user profiles and passwords., Describe the pros and cons of a client-server network. - It is easier to keep rack of the files as they are centrally stored. It is easier to update and maintain software and perform back-ups. It is therefore easier to maintain network security, the server is always on and is reliable. The cons are that it requires network specialists and if the server fails the entire network grinds to a halt., Describe the main characteristics of a VPN. - It is a network that relies on software. They share the same hardware as the physical networks and have some of the bandwidth. When data is sent over this virtual network securely over a WAN we call it a Virtual Private Network., Explain all the parts of this address... https://www.bbc.co.uk/bitesize/revision.html - https is the protocol; www.bbc.co.uk is the domain; the whole thing is called the URL, What are the advantages of storing data in the cloud? - It can be accessed from any device, it is easy to increase the amount of storage; the data can be backed up automatically; it doesn't require you to buy hardware ; the companies offering the service provide cybersecurity; you don't pay the wage of the maintainers directly., What are the disadvantages of storing data in the cloud? - You need the internet to access it; the data transmission could be intercepted by hackers; often it requires a subscription and ownership of the data stored on it is a cloudy area!,

1.4 [Wired and Wireless Networks]

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