need help to answer 6 simple questions that will be on a networking review exam

I simply need some questions answered that will be on my networking exam. These should be very simple for someone with experience in netwokring. I need these answers ASAP. Thanks in advance.

1.) Which of the following techniques is typically more efficient for sending a long stream of messages? (answers: packet switching or circuit switching)

2.) Which of the following techniques is typically more efficient for sending a single short message with just a few bytes of data? (answers: Packet switching or circuit switching)

3.) Suppose it takes 100 ms for a router to forward a packet. How long does a packet take to travel across 10 similar routers on similar networks? (Please show work, i believe it has to do with the n L/r equation)

4.) Suppose we send 1200B on a 9600 b/s link, and the entire message is received in 2 seconds. How far apart are the sender and receiver? (please show work)

5.)Suppose we want to send 100MB across a 5000km link in at most 100ms. What's the lowest acceptable link throughput? (please show work)

6.)How long does it take for 4MB to traverse a 10Mb/s link of length 100km? (please show work)

Compétences : Ingénierie, TSF

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N° du projet : #2329627