Note: Because of the amount of questions, MINIMUM EXPLANATION if FINE (One or Tw

Question

Note: Because of the amount of questions, MINIMUM EXPLANATION if FINE (One or Two Lines)

15. An Ethernet switch builds its forwarding table by sending requests to each station and waiting for responses.
True
False

16. If a station has two Ethernet frames to transmit, only the first one needs Preamble and SFD fields.
True
False

17. Ethernet network is synchronized network where all the stations run at the exactly the same clock.
True
False

18. When an Ethernet switch receives a frame whose destination address is FFFFFFFFFFFF, what does the switch do?
drop the packet
send a request to the source station
broadcast it to all the stations

19. An Ethernet switch receives a frame that is 40-byte long, it should drop the frame.
True
False

20. IEEE 802.11 wireless LAN uses CSMA/CD.
True
False

21. Wireless LANs always need a centralized controller.
True
False

22. In an ESS, the access points must be interconnected using wireless.
True
False

23. In IEEE 802.11g, some of the channels are partially overlapped in the frequency domain.
True
False

24. In IEEE 802.11a, some of the channels are partially overlapped in the frequency domain.
True
False

25. In CSMA/CA, it is possible that a station start to backoff before any collision is detected.
True
False

Explanation / Answer

Dear, 17. False 18. broadcast it to all the stations 20. True, due to collision avoidance property. Large differences in signal strengths Collisions can only be inferred afterward 21. False, as wireless LANs need to be able to scale, both in terms of the amount of traffic that they can support and the services that they can enable. That is difficult, to do with a centralized architecture that requires that all traffic has to go to a centralized controller. 24. False, as there is no overlap between channels in IEEE 802.11a. The energy in the overlapped part is quite low that we can ignore it for practical purposes. 25. False, as collisions must identified and MAC layer can retransmit the packet by upeer layer which is a significant dealy. 17. False

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