Q22. In a computer network a virus is spreading from machine to machine. Each week, the proportion of uninfected computers that remain uninfected is 0.50 with the rest becoming infected. Meanwhile, 0.50 of the computers that are infected are restored and become uninfected with the rest remaining infected. Suppose 0.80 of the network is currently uninfected. A a В

Q22. In a computer network a virus is spreading from machine to machine. Each week, the proportion of uninfected computers that remain uninfected is 0.50 with the rest becoming infected. Meanwhile, 0.50 of the computers that are infected are restored and become uninfected with the rest remaining infected. Suppose 0.80 of the network is currently uninfected. A a В

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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20-The joint probability of channel is defined as: P(x₁, y₁) = 1, P(x₁, y2) = 0, P(x2, ₁) = 0.5, P(x2, y2) = 0.5, P(x3, y₁) = 0.3, P(x3, y2) = 0.7. Find: Marginal entropies. Joint entropy 2- 3- 4- Conditional entropies. d- The mutual information between x₁ The trans information. Draw the channel model. e- f- and Y2.
A password system uses exact 8-character of alphanumeric. To be a secure password system, any password cannot contain the following keywords: (a) All numbers. I.e., must contain at least one letter in the password. (b)User's name. What is the probability of an adversary guessing John Hank's password correctly?
Consider a world on which each individual belongs to a family of six, each family resides in its own home, each house has a specific address and every person in a certain house is given a unique name.Assume that this world has a postal service providing letters from source to destination. The postal service needs (1) the letter to be in an envelope and (2)that the address (and nothing else) of the destination house be clearly shown on the envelope. Suppose each family has a delegated member who receives letters for the other family members and distributes them. The letters do not actually give the receivers of the letters a hint. a. Would the postal service.ever have to open the envelope and inspect the letter and include the service under your protocol?
Q22. In a computer network a virus is spreading from machine to machine. Each week, the proportion of uninfected computers that remain uninfected is 0.75 with the rest becoming infected. Meanwhile, 0.45 of the computers that are infected are restored and become uninfected with the rest remaining infected. Suppose 0.80 of the network is currently uninfected. A b B Using the probabilities and states given, what proportion of the network will be infected the next week? (Enter numerical value only. Round the percentage to 3 decimal places)
The probability of event A occurring is 10/10. The probability of event B occurring is 0/10. What is the entropy of this system?
Consider a world on which each individual belongs to a family of six, each family resides in its own home, each house has a specific address and every person in a certain house is given a unique name. Assume that this world has a postal service providing letters from source to destination. The postal service needs (1) the letter to be in an envelope and (2) that the address (and nothing else) of the destination house be clearly shown on the envelope. Suppose each family has a delegated member who receives letters for the other family members and distributes them. The letters do not actually give the receivers of the letters a hint. a. Define a procedure used by delegates to deliver letters from the transmitting family member to a receiving family member using the approach R1 above.
Question 1: The English alphabet contains 21 consonants and five vowels. Determine the number of strings of eight lowercase letters of English alphabet contain at least one vowel? Determine the number of possible passwords with eight or ten characters long, where each character is an ASCII letter and there must be at least one @' in the passwords.
The previous problem is in the picture. Suppose that I have 800 Gigabytes worth of movies on my hard drive at home, and I’d like to get them to a friend in Chicago. I could either send them over the Internet, or I could copy them to a thumb drive, drive to Chicago, and deliver them by hand. Assume that the specs for my cable connection are the same as in the previous problem, but the friend in Chicago has a cable connection which gets 25 Mbps down/5 Mbps up. Which would be faster? Show your work.
Suppose we have four machines that are using the Berkeley algorithm for clock synchronization. The time daemon is running on machine MO. The other machines are named M1, M2, and M3. The time readings on the four machines are as follows wenty-four hour clocks are usedt. MO 09:10 M1: 08:30 M2 10:10 M3: 07:14 In the third step of the algorithm, what are the values that the time daemon sends to each machine? Assume that the time values are expressed in minutes. Below, these values are presented in a vector value sent to MO, value sent to MI, value sent to M2. value sent to M3I none of these O84, 44, 96, 321 O(24, 16, -84, 92) O192. 84, 16. -24 O-32, 76, 40
Jenifer and Ted use symmetric-key cryptography for communicating confidentially. As there is no secure channel available for sending the secret key, they use Diffie-Hellman Key Agreement protocol to agree upon a secret key K. They select a prime p=2357, generator g=123 which are public. Jenifer selects a secret j = 1001, Ted selects a secret t = 1003, and they can generate the shared secret key K. But Darth intercepts the Jenifer-Ted communication channel. Find the keys generated by Darth to plan an MITM attack between Jenifer and Ted if he selects a random secret d= 1002.
int Alice and Bob are conducting Diffie-Hellman key exchange with the parameters p 149 and a = = Their parameters are small and we decide to crack the key exchange. b) What is Bob's private key? -2. Suppose Alice is observed sending public key A = 43 and Bob sends public key B = 129. a) What is Alice's private key? c) What is the shared secret?
There are many sensors on a wind turbine, based on each sensor's reading many alerts are generated as (start, end). For easier monitoring, our customer is asking to raise alerts on the turbine level instead of on each sensor. If any sensor is having an alert, there should be an alert for the entire wind turbine. Suppose the alerts created with two sensors readings are [(0,3),(5,10),(1,4),(10,15)], then the turbine level alert should be [(0,4),(5,15)]. Return the alerts sorted by the start timestamp. If there is no alert from the sensor level, return an empty array []. Code needs to be in Python?