II. Concepts: B1-7 (5 points each, 35 points in total) B1. What is the main task of the internet layer in the TCP/IP reference model respectively? What kind of protocol performs that task? B2. Please explain the differences between switches and routers. Hint you: Which layer do they work at? What kind of address do they forward data based on? B3. Why we need media access control? Please list two or more media access control methods. B4. What is the exposed station problem? Please sketch a graph to explain if necessary. B5. Besides flooding, what other routing algorithms have you learned? B6. Transport layer uses both flow control and congestion control. Please tell us what flow control is and what congestion control is? B7. What is the main difference between TCP and UDP?
W: But Mr. Shin, please don't forget about your appointment with Natalie at 2:00. You know she is a very important client for us, OK?
M: I know that. I' II try to be here on time. If I am late, could you please make an excuse for me?
W: Okay, by the way, did you finish making the list of things in the warehouse for the meeting with Susan at 5:00?
Where is the man going?
A.The sales department
B.To meet Anna
C.Business trip
D.Main office
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