O Calculate the total number of bits used in downloading a 50 MB video file. Also calculate the time (in minutes) it takes to download the same video file, if the download link is a telephone line with 9600 baud rate. Assume 8 - bits of data per character, 1 – start bit, 1 - stop bit, and 1 parity bit. -

51. Prepare a datafile for the ADJUST program to solve the following horizontal network. 4323.793 4148 349 4558.156 Az90d 3086.928 R 6983.374, 0.000 2165 823 287.737

Using an online AES calculator, show the output of two blocks that differ by exactly one bit. a. Create the equivalent of 1 block of data (128-bits), set a key, use ECB mode and run the calculator. Show the resulting screen. b. Modify the plaintext data to differ by exactly one bit and run the calculator with the same key and mode as in part a. Show the new resulting output values. c. List two observations about the results of parts a and b above.

Suppose a file of 10,000 bytes is to be sent over a line at 2400 bps. A. Calculate the overhead in bits and time in using asynchronous communication. Assume one start bit and a stop element of length one bit, and 8 bits to send the byte itself for each character. The 8-bit character consists of all data bits, with no parity bit. B. Calculate the overhead in bits and time using synchronous communication. Assume that the data are sent in frames. Each frame consists of 1000 characters = 8000 bits and an overhead of 48 control bits per frame. C. What would the answers to parts (a) and (b) be for a file of 100,000 characters?

As the error-detection and correction capability of a code increases, we would expect in general the overhead bits to protect a group of data bits to decrease remain the same increase

One way of detecting errors is to transmit data as a block of n rows of k bits per row and adding parity bits to each row and each column. The lower-right corner is a parity bit that checks its row and its column, Will this scheme detect all single errors? Double errors? Triple errors?

2. Convert the following binary numbers to floating point format. Assume a binary format consisting of a sign bit (negative = 1), a base 2, 8-bit, excess-128 exponent, and 23 bits of mantissa, with the implied binary point to the right of the first bit of the mantissa. a. 110110.011011 b. -1.1111001 c. 0.1100×236 d. 0.1100×2-36

Suppose a file of 10,000 bytes is to be sent over a line at 2400 bps. A. Calculate the overhead in bits and time in using asynchronous communication. Assume one start bit and a stop element of length one bit, and 8 bits to send the byte itself for each character. The 8-bit character consists of all data bits, with no parity bit. B. Calculate the overhead in bits and time using synchronous communication. Assume that the data are sent in frames. Each frame consists of 1000 characters = 8000 bits and an overhead of 48 control bits per frame. C. What would the answers to parts (a) and (b) be for a file of 100,000 characters?