Electrical Engineering 122 - Spring 2001 - Walrand - Midterm 2

Electrical Engineering 122 - Spring 2001 - Walrand - Midterm 2

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Unformatted text preview: EECS 122, Midterm #2 Solutions, Spring 2001 EECS 122, Spring 2001 Midterm #2 Solutions Professor Walrand Multiple Choice (5/20) A. Flow control in TCP is designed to (select the correct statement(s)) (a) Limit the number of losses in routers (b) Share the link bandwidth fairly (c) Share the link bandwidth efficiently (d) Avoid overwhelming the destination B. Select the correct statements (if any): (a) Output buffer switches use memory more efficiently than virtual output buffer switches (b) The memory throughput of input buffer switches can be smaller than that of virtual output buffers (c) Virtual output buffer switches have no head of line blocking C. Reservation Aloha is more efficient than Aloha because (choose the correct statement(s)) (a) The probability of transmission automatically adapts to the load (b) The probablily of collision is smaller with shorter reservation packets (c) Fewer stations transmit than reserve (d) The long packet transmissions are not subject to collisions D. Consider an M/M/1 queue with a fixed utilization of 80%. Choose the correct statements(s): (a) The average queue length decreases with the arrival rate (b) The average delay per packet decreases with the arrival rate (c) The average queue length decreases with the service rate E. In an Ethernet network, the spanning tree algorithm guarantees that (choose the correct statement(s)) E....
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This note was uploaded on 11/21/2009 for the course EE 122 taught by Professor Ee122 during the Spring '06 term at Berkeley.

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Electrical Engineering 122 - Spring 2001 - Walrand - Midterm 2

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