Electrical Engineering 122 - Fall 1992 - Wu - Midterm 2

Electrical Engineering 122 - Fall 1992 - Wu - Midterm 2 -...

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EE122, Midterm #2, Fall 1992 EE122, Fall 1992 Midterm #2 Professor F. Wu Problem #1 (multiple choice) (1 pt.) In comparing efficiency n of automatic repeat request protocols, let us assume SRP and GO- BACK-N have the same window size. a. n(ABP) < n(SRP) < n(GO-BACK-N) b. n(ABP) < n(GO-BACK-N) < n(SRP) c. n(SRP) < n(ABP) < n(GO-BACK-N) Problem #2 (multiple choice) (1 pt.) Under a high load, which of the following MAC protocols has the smallest media access time? a. Slotted ALOHA b. Token ring c. Ethernet Problem #3 (multiple choice) (1 pt.) Consider the slotted ALOHA protocol; suppose there is one successful transmission every 4 time slots on the average. What is the average number of transmission attempts during this period? a. 1.38x4 (note: e^(-1.38) = 1/4) b. 0.35x4 (note: 0.35e^(-.035) = 1/4) c. 0.69x4 (note: e^-2(0.29) = 1/4) Problem #4 (multiple choice) (1 pt.) In a token bus network, the next station to which the token is passed should be a. physically closest to the station holding the token, with the exception
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Electrical Engineering 122 - Fall 1992 - Wu - Midterm 2 -...

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