Midterm_2005 - Department of Computer Science and...

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Department of Computer Science and Engineering COSC 3213: Computer Networks I (Winter 2005) Instructor: N. Vlajic Date: February 23, 2005 Midterm Examination Instructions: Examination time: 75 min. Print your name and CS student number in the space provided below. This examination is closed book and closed notes. Calculators allowed. There are 6 questions. The points for each question are given in square brackets, next to the question title. The overall maximum score is 100. Answer each question in the space provided. If you need to continue an answer onto the last page, clearly indicate that and label the continuation with the question number. Question Points 1 / 30 2 / 10 3 / 15 4 / 15 5 / 10 6 / 10 7 / 10 Total / 100 FIRST NAME: ___________________________ LAST NAME: ___________________________ STUDENT #: ___________________________ 1
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1. Multiple Choice [30 points] t i m e : 2 0 m i n Circle the letter beside the choice that is the best answer for each question. For each question choose only ONE answer. (1.1) The Internet model consists of __________________________ layers. (a) three (b) five (c) seven (d) eight (1.2) As a data packet moves from the lower to the upper layers, headers are ______________________________ . (a) added (b) subtracted (c) rearranged (d) modified (1.3) When data are transmitted from device A to device B, the header from A’s layer 4 is read by B’s ______________________________ layer. (a) physical (b) network (c) transport (d) application (1.4) Which of the following can be determined from a frequency-domain graph of a signal? (a) bandwidth (b) phase (c) power (d) all of the above (1.5) When one of the components of a signal has a frequency of zero, the average amplitude of the signal _____________________________________ .
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(1.6) What is the bandwidth of a signal that ranges from 40 KH to 4 MHz? (a) 36 MHz (b) 360 KHz (c) 3.96 MHz (d) 396 KHz (1.7) A periodic signal can always be decomposed into __________________________ . (a) exactly an odd number of sine waves (b) a set of sine waves (c) a set of sine waves, one of which must have a phase of 0º (d) non of the above (1.8) A signal is measured at two different points. The power is P 1 at the first point and P 2 at the second point. The attenuation between the two points is 0 dB. This means
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Midterm_2005 - Department of Computer Science and...

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