Edexcel curriculum (2015)
High Level language
Law & Legislation
Peer to peer
Pictures (data rep)
Run length encoding
Solid state HD
Security: a private WAN is more secure because the railway company is the only user; a VPN uses a public network such as the internet, therefore is more vulnerable to attack. Encryption required.
Performance, reliability and control: Network/bandwidth solely for the railway company’s use
Control: as sole user of the private WAN the railway company has complete control over how it is set up and run; if using a VPN the railway company will have far less control since the network service provider will need to balance the needs of all users of the network.
Cost: the railway company must bear all the cost of setting up and running the private WAN; the VPN uses a public network so the costs are spread between many users.
Expertise: setting up and running a private WAN requires technical/managerial expertise which the railway company may not have; using a VPN on a public network outsources these activities to a service provider.
How to get full marks - A balanced response with sound and relevant points from more than one of the above examples Response includes a recommendation that is fully justified with regard to the rail company. Response is clearly structured, with sound control of expression and meaning. Spelling and punctuation are mostly accurate, with some errors.