A set of traffic lights at a T-junction is to be modelled on a computer.
Before modelling can be carried out there is a need to
collect data at the T-junction. This data is then to be input
into a computer.
a Describe three pieces of data that would need to be
collected for this model.

Write an essay on online collaboration, how to do it, the challenges, resolving the challenges, and consider whether the risks are greater than rewards. ( need )

1. which of the following statements are true about routers and routing on the internet. choose two answers. a. protocols ensure that a single path between two computers is established before sending packets over it. b. routers are hierarchical and the "root" router is responsible for communicating to sub-routers the best paths for them to route internet traffic. c. a packet traveling between two computers on the internet may be rerouted many times along the way or even lost or "dropped". d. routers act independently and route packets as they see fit.

(, urgent need): how do i change my username