Homework Answers
A checksum detects some 2 bit errors and all 1 bit errors.
So, the answer is 1.
A single bit parity detects all single bit errors.
So, the answer is 1.
Two dimensional parity bit can detect upto all 3 bit errors.
So, the answer is 3.
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Up to how many bit errors can be detected for sure by the following mechanisms? just...
A Hamming code is a technique where errors can not only be detected but can also...
A Hamming code is a technique where errors can not only be detected but can also be corrected. The simplest example of this kind of code is the (7,4)-Hamming code. In this scheme, a codeword is 7 bits long. We number the positions as follows: 1 2 3 4 5 6 7 The message that is sent is only four bits long, with these four bits occupying positions 3, 5, 6, and 7. Bits 1, 2, and 4 are...
In an even/odd parity error code a computer receives the following 4 bit word: 1101 Is...
In an even/odd parity error code a computer receives the following 4 bit word: 1101 Is this a valid word? Why or why not? If not, can it be corrected? If yes how if not why? At least how many Bit flip must separate code words If I want to correct (not just detect) 1 bit-flip errors?
COMPUTER NETWORK AND CYBERSECURITY Q5 Explain the difference between single-bit errors and burst errors in error...
COMPUTER NETWORK AND CYBERSECURITY Q5 Explain the difference between single-bit errors and burst errors in error control in communications systems. (3 marks) (a) If a noise event causes a burst error to occur that lasts for 0.1 ms (millisecond) and data is being transmitted at 100Mbps, how many data bits will be affected? (3 marks) (b) Under what circumstances is the use of parity bits an appropriate error control technique?
6. Suppose we want an error-correcting code that will allow all single-bit errors to be corrected...
6. Suppose we want an error-correcting code that will allow all single-bit errors to be corrected for memory words of length 10. a) How many parity bits are necessary? b) Assuming we are using the Hamming algorithm presented in this chapter to design our error-correcting code, find the code word to represent the 10-bit information word: 1001100110
1. a)UDP and TCP use 1’s complement for their checksums. Suppose you have the following three...
1. a)UDP and TCP use 1’s complement for their checksums. Suppose you have the following three 8 bit bytes: 0101 0011, 0111 0110, 1001 0011. What is the 1’s complement of the sum of these 3 8-bit bytes? Show all work. Why is it that the 1’s complement is used and not just the sum? What is the sum of the three 8 bit bytes and the checksum you just computed? What is it if you change the first 8...
****************IN C PROGRAMMING**************** Sometimes even the smallest change in data can make a big difference. Luckily,...
****************IN C PROGRAMMING**************** Sometimes even the smallest change in data can make a big difference. Luckily, there are algorithms that will let us not only detect when there has been an error(like checksums), but also correct when an error has occurred. These algorithms are called error-correcting codes.There are many examples of error correcting codes but one of the simplest examples is called a parity bit. A parity bit is just a single bit (1 or 0) that indicates whether a...
10. [12 pts] After manufacture, computer disks are tested for errors. Let X be the number...
10. [12 pts] After manufacture, computer disks are tested for errors. Let X be the number of errors detected on a randomly chosen disk. The following table presents values of the cumulative distribution function F(x) of X 12 34 F0.41 0.72 0.83 0.95 1 (a) Find the probability mass function (b) What is the probability that two or fewer error are detected? (c) What is the probability that exactly one error is detected? (d) How many errors would you expect...
Q1 Error detection/correction Can these schemes correct bit errors: Internet checksums, two-dimendional parity, cyclic...
Q1 Error detection/correction Can these schemes correct bit errors: Internet checksums, two-dimendional parity, cyclic redundancy check (CRC) A. Yes, No, No B. No, Yes, Yes c. No, Yes, No D. No, No, Yes E. Ho, hum, ha Q2 CRC vs Internet checksums Which of these is not true? A. CRC's are commonly used at the link layer B. CRC's can detect any bit error of up to r bits with an r-bit EDC. c. CRC's are more resilient to bursty...
11)Describe the three mechanisms in detail for how a material can be strengthened. Make sure to...
11)Describe the three mechanisms in detail for how a material can be strengthened. Make sure to explain the mechanic and reasoning for why each strengthens the material.
Determine how many terms of the following convergent series must be summed to be sure that the re...
Determine how many terms of the following convergent series must be summed to be sure that the remainder is less than 10 in magnitude. 3k +1 The number of terms that must be summed is (Round up to the nearest integer as needed.)
Determine how many terms of the following convergent series must be summed to be sure that the remainder is less than 10 in magnitude. 3k +1 The number of terms that must be summed is (Round up...
6. Suppose we want an error-correcting code that will allow all single-bit errors to be corrected for memory words of length 10. a) How many parity bits are necessary? b) Assuming we are using the Hamming algorithm presented in this chapter to design our error-correcting code, find the code word to represent the 10-bit information word: 1001100110
10. [12 pts] After manufacture, computer disks are tested for errors. Let X be the number of errors detected on a randomly chosen disk. The following table presents values of the cumulative distribution function F(x) of X 12 34 F0.41 0.72 0.83 0.95 1 (a) Find the probability mass function (b) What is the probability that two or fewer error are detected? (c) What is the probability that exactly one error is detected? (d) How many errors would you expect...
Q1 Error detection/correction Can these schemes correct bit errors: Internet checksums, two-dimendional parity, cyclic redundancy check (CRC) A. Yes, No, No B. No, Yes, Yes c. No, Yes, No D. No, No, Yes E. Ho, hum, ha Q2 CRC vs Internet checksums Which of these is not true? A. CRC's are commonly used at the link layer B. CRC's can detect any bit error of up to r bits with an r-bit EDC. c. CRC's are more resilient to bursty...
Determine how many terms of the following convergent series must be summed to be sure that the remainder is less than 10 in magnitude. 3k +1 The number of terms that must be summed is (Round up to the nearest integer as needed.)
Determine how many terms of the following convergent series must be summed to be sure that the remainder is less than 10 in magnitude. 3k +1 The number of terms that must be summed is (Round up...
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