Web Science/Part1: Foundations of the web/Ethernet/Communication over a shared Medium/quiz

{What general problems exist while making digital communication over a shared medium? + Participants have to have a way not to talk at the same time. + Participants have to talk the same language / protocol. - The used protocol has to be an Internet standard - One has to ensure that everyone gets the same amount of time to put data to the shared medium. - Communication must be encrypted. + One has to make sure who sends a message and to whom it should be delivered. + Messages have to be delivered correctly and be secured against data loss
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 * In a digital setting transmitting data at the same time will lead to corrupted data.
 * Yes otherwise communication will not work.
 * There are only a few Internet standards and one can use any protocol that all nodes on the medium speak.
 * This is how a Protocol like token ring is designed. There is no need to do that.
 * Messages should be encrypted on a shared medium but this is not necessary to ensure communication.
 * Yes this is important.
 * even though this is true this requirement holds for any form of digital communication.

{Which of the following statements are characteristic for communication over a shared medium? - The smallest amount of information that can be transferred is a Bit. + Everyone who has access to the medium can receive all the data that is being put on the medium. + Several computers use the same medium to communicate with each other - Collisions will occur if using a shared medium. - Communication must be encrypted.
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 * Even though this statement is true it is not characteristic for a shared medium.
 * Exactly.
 * Yes. That is exactly the definition.
 * This depends on the protocol. In token ring collisions will not occur.
 * Messages should be encrypted on a shared medium but this is not necessary to ensure communication.