Quiz 3
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Quiz 3 as PDF for free.
More details
- Words: 985
- Pages: 2
POLYTECHNIC UNIVERSITY OF THE PHILIPPINES College of Engineering Computer Engineering Department NDC Cmpd., Sta. Mesa Manila
QUIZ#1 3RD MAJOR EXAMINATION
CMP510 Block
Name
Score
GENERAL INSTRUCTIONS: 1. Follow all instructions carefully. Failure to do so will warrant a substantial deduction from your final score. 2. Write everything in non-red ink. No borrowing of pens, calculators, etc. 3. You are not allowed to leave your seat unless you are through with the exam. If you have any questions, just raise your hand and the instructor or proctor will attend to you. 4. Talking to or looking at your seatmate (and his/her paper) is automatically considered as cheating which is subject to very serious sanctions as stipulated in the student handbook.
GOOD LUCK ! ! !
MULTIPLE CHOICE. Choose the letter of the BEST answer. Write your answer on the space provided. Use UPPERCASE letters only. 1.
3.
5.
7.
9.
11.
Which file transfer protocol supports wildcard file transfer? A. Xmodem C. Zmodem B. Ymodem D. Kermit Which file transfer protocol does not transmit file attributes? A. Xmodem C. Zmodem B. Ymodem D. Kermit
2.
If the frequency of an anlog signal is 2.5MHz, the sampling rate of the PAM device should be A. 5,000,000 samples per second B. 6,000,000 samples per second C. 7,000,000 samples per second D. All of the above
6.
Which file transfer protocol is ideal for file transfer between dissimilar computers? A. Xmodem C. Zmodem B. Ymodem D. Kermit Which file transfer protocol can communicate through both 7-bit and 8-bit data ports, regardless of the communication hardware employed?
8.
A. Xmodem C. Zmodem B. Ymodem D. Kermit Which of the following voltage levels is represented by 110101? A. 4.162500V B. 4.290625V
1TSY2007-2008
C. 4.418750V D. 4.546870V
CMP510
4.
10.
12.
Which file transfer protocol use CRC-32 as its error checking mechanism? A. Xmodem C. Zmodem B. Ymodem D. Kermit Demultiplexing by a time division multiplexer occurs based upon: A. the priority assigned to a computer B. the position of a frame within a group of frames C. the activity of a connected computer D. None of the above Local loop lines are used to connect a telephone to its central office. This statement is: A. undoubtedly true B. false, trunk lines are used to connect a telephone to its central office C. false, local loop lines are used in telephones with locals (PABX) D. false, local loop lines are used to connect two central offices Which file transfer protocol cannot use CRC-CCITT as its error checking mechanism? A. Xmodem C. Zmodem B. Ymodem D. Kermit For Problems 10 to 14 An analog signal is to be converted into digital using PCM that uses 6 bits. The range of the analog voltage is from -2.5V to 5.7V. The PCM uses unipolar encoding scheme. Which of the following voltage levels is represented by 001111? A. -0.834375V C. -0.578125V B. -0.706250V D. -0.450000V If a sample has a voltage level of -1.5V, to what digital value will it be converted after PCM is applied? A. 000110 C. 001000 B. 000110 D. 101000
Page 1 of 2
13.
If a sample has a voltage level of 2.25V, to what digital value will it be converted after PCM is applied? A. 100101 C. 100111 B. 100110 D. 101000
14.
If a sample has a voltage level of 5.00V, to what digital value will it be converted after PCM is applied? A. 111001 C. 111011 B. 111010 D. 111100
15.
Which file transfer protocol is ideal for high-speed file transfer? A. Xmodem C. Zmodem B. Ymodem D. Kermit
16.
Multiplexing is primarily used to:
Which file transfer protocol uses packets with 0 to 94 bytes of data? A. Xmodem C. Zmodem B. Ymodem D. Kermit For problems 19 to 27. The message polynomial M(x) is 100001100110 and the generator polynomial G(x) is 111100. What is the degree of the generator polynomial? A. 3 C. 5 B. 4 D. None of the choices What is M'(x)? A. 100001100110000 C. 10000110011000000 B. 1000011001100000 D. None of the choices What is the remainder? A. 10000 C. 10011 B. 10001 D. None of the choices If T(x) was transmitted but the frame received was 10000110010101100, will the error be detected? A. Yes C. There's no error B. No D. None of the choices If T(x) was transmitted but the frame received was 10000110011010000, will the error be detected?
18.
17.
19.
21. 23. 25.
27.
29.
A. Yes C. There's no eroor B. No D. None of the choices Which file transfer protocol uses data compression in order to reduce the time of file transmission? A. Xmodem C. Zmodem B. Ymodem D. Kermit
A. facilitate the simultaneous sharing of the same channel by several signals B. increase the number of users for a particular channel C. decrease line costs D. All of the above
20.
22. 24. 26.
28.
30.
Which file transfer protocol is ideal for low-speed file transfer through high-quality lines? A. Xmodem C. Zmodem B. Ymodem D. Kermit What is the degree of the message polynomial?
A. 11 C. 13 B. 12 D. None of the choices What is the quotient? A. 110000010101 C. 110010011100 B. 110010010100 D. None of the choices What is T(x)? A. 10000110011010000 C. 10000110011010011 b. 10000110011010001 D. None of the choices If T(x) was transmitted but the frame received was 10000110011010000, will the error be detected? A. Yes C. There's no error B. No D. None of the choices Which file transfer protocol must receive two sequential CAN characters before retransmitting a file transfer? A. Xmodem C. Zmodem B. Ymodem D. Kermit Which file transfer protocol uses checksum in error checking mechanism? A. Xmodem C. Zmodem B. Ymodem D. Kermit
You may say you KNOW, but by your actions it is KNOWN!
God has a broad back; if you have burden Let him take it from you
1TSY2007-2008
CMP510
Page 2 of 2
QUIZ#1 3RD MAJOR EXAMINATION
CMP510 Block
Name
Score
GENERAL INSTRUCTIONS: 1. Follow all instructions carefully. Failure to do so will warrant a substantial deduction from your final score. 2. Write everything in non-red ink. No borrowing of pens, calculators, etc. 3. You are not allowed to leave your seat unless you are through with the exam. If you have any questions, just raise your hand and the instructor or proctor will attend to you. 4. Talking to or looking at your seatmate (and his/her paper) is automatically considered as cheating which is subject to very serious sanctions as stipulated in the student handbook.
GOOD LUCK ! ! !
MULTIPLE CHOICE. Choose the letter of the BEST answer. Write your answer on the space provided. Use UPPERCASE letters only. 1.
3.
5.
7.
9.
11.
Which file transfer protocol supports wildcard file transfer? A. Xmodem C. Zmodem B. Ymodem D. Kermit Which file transfer protocol does not transmit file attributes? A. Xmodem C. Zmodem B. Ymodem D. Kermit
2.
If the frequency of an anlog signal is 2.5MHz, the sampling rate of the PAM device should be A. 5,000,000 samples per second B. 6,000,000 samples per second C. 7,000,000 samples per second D. All of the above
6.
Which file transfer protocol is ideal for file transfer between dissimilar computers? A. Xmodem C. Zmodem B. Ymodem D. Kermit Which file transfer protocol can communicate through both 7-bit and 8-bit data ports, regardless of the communication hardware employed?
8.
A. Xmodem C. Zmodem B. Ymodem D. Kermit Which of the following voltage levels is represented by 110101? A. 4.162500V B. 4.290625V
1TSY2007-2008
C. 4.418750V D. 4.546870V
CMP510
4.
10.
12.
Which file transfer protocol use CRC-32 as its error checking mechanism? A. Xmodem C. Zmodem B. Ymodem D. Kermit Demultiplexing by a time division multiplexer occurs based upon: A. the priority assigned to a computer B. the position of a frame within a group of frames C. the activity of a connected computer D. None of the above Local loop lines are used to connect a telephone to its central office. This statement is: A. undoubtedly true B. false, trunk lines are used to connect a telephone to its central office C. false, local loop lines are used in telephones with locals (PABX) D. false, local loop lines are used to connect two central offices Which file transfer protocol cannot use CRC-CCITT as its error checking mechanism? A. Xmodem C. Zmodem B. Ymodem D. Kermit For Problems 10 to 14 An analog signal is to be converted into digital using PCM that uses 6 bits. The range of the analog voltage is from -2.5V to 5.7V. The PCM uses unipolar encoding scheme. Which of the following voltage levels is represented by 001111? A. -0.834375V C. -0.578125V B. -0.706250V D. -0.450000V If a sample has a voltage level of -1.5V, to what digital value will it be converted after PCM is applied? A. 000110 C. 001000 B. 000110 D. 101000
Page 1 of 2
13.
If a sample has a voltage level of 2.25V, to what digital value will it be converted after PCM is applied? A. 100101 C. 100111 B. 100110 D. 101000
14.
If a sample has a voltage level of 5.00V, to what digital value will it be converted after PCM is applied? A. 111001 C. 111011 B. 111010 D. 111100
15.
Which file transfer protocol is ideal for high-speed file transfer? A. Xmodem C. Zmodem B. Ymodem D. Kermit
16.
Multiplexing is primarily used to:
Which file transfer protocol uses packets with 0 to 94 bytes of data? A. Xmodem C. Zmodem B. Ymodem D. Kermit For problems 19 to 27. The message polynomial M(x) is 100001100110 and the generator polynomial G(x) is 111100. What is the degree of the generator polynomial? A. 3 C. 5 B. 4 D. None of the choices What is M'(x)? A. 100001100110000 C. 10000110011000000 B. 1000011001100000 D. None of the choices What is the remainder? A. 10000 C. 10011 B. 10001 D. None of the choices If T(x) was transmitted but the frame received was 10000110010101100, will the error be detected? A. Yes C. There's no error B. No D. None of the choices If T(x) was transmitted but the frame received was 10000110011010000, will the error be detected?
18.
17.
19.
21. 23. 25.
27.
29.
A. Yes C. There's no eroor B. No D. None of the choices Which file transfer protocol uses data compression in order to reduce the time of file transmission? A. Xmodem C. Zmodem B. Ymodem D. Kermit
A. facilitate the simultaneous sharing of the same channel by several signals B. increase the number of users for a particular channel C. decrease line costs D. All of the above
20.
22. 24. 26.
28.
30.
Which file transfer protocol is ideal for low-speed file transfer through high-quality lines? A. Xmodem C. Zmodem B. Ymodem D. Kermit What is the degree of the message polynomial?
A. 11 C. 13 B. 12 D. None of the choices What is the quotient? A. 110000010101 C. 110010011100 B. 110010010100 D. None of the choices What is T(x)? A. 10000110011010000 C. 10000110011010011 b. 10000110011010001 D. None of the choices If T(x) was transmitted but the frame received was 10000110011010000, will the error be detected? A. Yes C. There's no error B. No D. None of the choices Which file transfer protocol must receive two sequential CAN characters before retransmitting a file transfer? A. Xmodem C. Zmodem B. Ymodem D. Kermit Which file transfer protocol uses checksum in error checking mechanism? A. Xmodem C. Zmodem B. Ymodem D. Kermit
You may say you KNOW, but by your actions it is KNOWN!
God has a broad back; if you have burden Let him take it from you
1TSY2007-2008
CMP510
Page 2 of 2
