Question Description
(pages 187-192
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Chapter 4
3. Consider the delay of pure ALOHA versus slotted ALOHA at low load. Which one is
less? Explain your answer.7
8. In the binary countdown protocol, explain how a lower-numbered station may be
starved from sending a packet.
11. Six stations, A through F, communicate using the MACA protocol. Is it possible for
two transmissions to take place simultaneously? Explain your answer.
21. Name two networks that allow frames to be packed back-to-back. Why is this feature
worth having?
27. Give two reasons why networks might use an error-correcting code instead of error
detection and retransmission.
30. What is the maximum size of the data field for a 3-slot Bluetooth frame at basic rate?
Explain your answer.
35. List some of the security concerns of an RFID system.
39. Store-and-forward switches have an advantage over cut-through switches with respect
to damaged frames. Explain what it is.
9. Compare the deference between MAC (Medium Access Control)
sublayer and LLC (Logical Link Control) sublayer,
10 In network there are 4 devices that from the outside look very similar. Describe the difference between hubs, switches, bridges, and routers.
12. A seven-story office building has 15 adjacent offices per floor. Each office contains a
wall socket for a terminal in the front wall, so the sockets form a rectangular grid in the vertical plane, with a separation of 4 m between sockets, both horizontally and vertically. Assuming that it is feasible to run a straight cable between any pair of sockets, horizontally, vertically, or diagonally, how many meters of cable are needed to connect all sockets using
(a) A star configuration with a single router in the middle?
(b) A classic 802.3 LAN?
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