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(COMP362)[2010](f)midterm~420^_47671.pdf
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HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

COMP 362: Computer Communication Networks II

MID-TERM EXAMINATION

Fall, 2010

Time Limit: 2 hours


NAME ________________________________________
STUDENT NUMBER _______________________________________
DEPARTMENT _______________________________________



Instructions to Students:
1.
There are 7 questions (Q1Q7) and 8 pages, including this cover and one draft sheet. Check that you have all the pages.


2.
Write your name, student number, lecture section number (if applicable), and department on this page.


3.
Answer all questions in the space provided. In case you need additional space, use the back of the corresponding sheet. If you need to use the back of the sheets, make sure that the continuation is indicated clearly.


4.
This is a closed-book, closed-note exam.


5.
Leave all sheets stapled together except for the last one (draft paper).


6.
If you believe a question is subject to interpretation, please interpret it clearly in writing. This often means you should precisely state the assumptions you make, if you feel it is necessary to make assumptions.






Grading.


Question #1: ________ / 20

Question #2: ________ / 15

Question #3 ________ / 7

Question #4 ________ / 15
Question #5: ________ / 18

Question #6: ________ / 8

Question #7: ________ / 17



TOTAL: _________________ / 100




Q1..[20.Points].True.or.false.
Determine whether the following statements are true or false. Circle the answer. Please briefly describe the reasons for your choice.


i.
The infrastructure mode prohibits a wireless network from using multi-hop routing.

True False
There are wireless networks that use both base stations and multihop routing, e.g., some mesh networks.




ii.
Because wireless channels are broadcast media, it is impossible for 2 wireless end systems to construct a point-to-point communication link.

True False
It is possible to construct a point-to-point communication link by directional antennae. Logically, the MAC layer can also use addresses to emulate point-to-point communication.


iii.
An 802.11 frame may contain 4 MAC addresses.

True False
802.11 include addresses for the destination, source, router interface, and another address may be used for ad hoc mode.


iv.
The 3G cellular phones use the same physical layer protocol, in order to ensure GSM/UMTS phones can call CDMA-2000 phones.

True False
GSM and CDMA-2000 use different physical layer protocols with different multiplexing techniques, modulation schemes, and coding schemes.

v.
The PIM multicast protocol in dense mode uses a center-based approach.

True False
PIM dense mode uses RPF with pruning.








Q2..[15.Points].Multiple.choices..
Multiple choice. Choose the bes