Question: 1. One way of detecting errors is to transmit data as a block of n rows of k bits per row and add parity bits

1. One way of detecting errors is to transmit data as a block of n rows of k bits per row and add parity bits to each row and each column (for this problem k is >5). The bit in the lower-right corner is a parity bit that checks its row and its column. Will this scheme detect burst errors of length 5? (A) TRUE (B) FALSE A noiseless 16khz channel is sampled once every 1ms with a 4-bit sample. What is the data rate? 2. (A) 4Kbps (B) 8kbps (C) 16kpbs (D) none of the above What is A particular data channel has a signal to noise ratio of 1db and a bandwidth of 20Khz. Shannon's maximum data rate over this channel? 3. (A) 88Khz (B) 20Khz (C) 10Khz (D) none of the above Slotted ALOHA had about half the throughput of pure ALOHA. (A) TRUE (B) FALSE 4. Ignoring collisions, what percentage of the channel bandwidth was pure ALOHA capable of 5. using? (A) about half (B) about 18% (C) about 34% (D) 100% (E) None of the above 6. Including collis ions, what percentage of the channel bandwidth was pure ALOHA capable of using? (A) about half (B) about 18% (C) about 34% (D) 100% (E) None of the above 7. In nonpersisten t CSMA, if a transmitter ready to transmit senses the channel is busy, the ransmitter waits a random amount of time, and senses the line again. If it's still busy it repeats the process, otherwise it transmits the data. (A) True (8) False 8. In 1-persistent CSMA, if a transmitter ready to transmit senses the channel is busy, it waits When the channel becomes free it immediately seizes the line and tries to transmit. (A) True (B) False The only way for a CSMA/CD protocol transmitter to determine if there was a collision is if the receiver does not send an acknowledgement. (A) True (B) False 9. 10. CSMA/CD is an example of a collision free protocol. (A) True (B) False

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