5. Every hour the worm X spreads from each infected computer to one previously uninfected computer In answering these questions you should explain how you determined your answers. (a) Give a table showing the number of infected computers at each hour across a 24 hour perio At time t=0 the number of X infected computers is N = 1. (b) By time t = 6.5 a counter worm W has been developed and it is deployed on one infect computer. W removes malware X from any host W is on. The counter worm W sprea slightly more quickly than X, with each W spreading to two X infected hosts each hou provided such hosts are available. Provide another table showing the spread of W and the impact on X across an appropria time frame, starting from t = 0 again. Note the offset in time means that at t = 6.5 the number of X infected computers reduces 1, so the spread of t = 7 will be slightly smaller than before. Overall the number of X infect computers will go up on the hour, and down on the half hour. (c) Graph the two cases against each other, clearly indicating on it where N = 0. (d) Assume that at time t = 9, X evolves to spread to three uninfected computers each hour. Wh subsequently happens? 6. Briefly describe, in your own words, each of the following. Be sure to specify the domain and natu of each. (a) An XML bomb. (b) BlueSmack. (c) Mydoom. (d) Torpig.
5. Every hour the worm X spreads from each infected computer to one previously uninfected computer In answering these questions you should explain how you determined your answers. (a) Give a table showing the number of infected computers at each hour across a 24 hour perio At time t=0 the number of X infected computers is N = 1. (b) By time t = 6.5 a counter worm W has been developed and it is deployed on one infect computer. W removes malware X from any host W is on. The counter worm W sprea slightly more quickly than X, with each W spreading to two X infected hosts each hou provided such hosts are available. Provide another table showing the spread of W and the impact on X across an appropria time frame, starting from t = 0 again. Note the offset in time means that at t = 6.5 the number of X infected computers reduces 1, so the spread of t = 7 will be slightly smaller than before. Overall the number of X infect computers will go up on the hour, and down on the half hour. (c) Graph the two cases against each other, clearly indicating on it where N = 0. (d) Assume that at time t = 9, X evolves to spread to three uninfected computers each hour. Wh subsequently happens? 6. Briefly describe, in your own words, each of the following. Be sure to specify the domain and natu of each. (a) An XML bomb. (b) BlueSmack. (c) Mydoom. (d) Torpig.
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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Transcribed Image Text:5. Every hour the worm X spreads from each infected computer to one previously uninfected computers.
In answering these questions you should explain how you determined your answers.
(a) Give a table showing the number of infected computers at each hour across a 24 hour period.
At time t=0 the number of X infected computers is N = 1.
(b) By time t = 6.5 a counter worm W has been developed and it is deployed on one infected
computer. W removes malware X from any host W is on. The counter worm W spreads
slightly more quickly than X, with each W spreading to two X infected hosts each hour,
provided such hosts are available.
Provide another table showing the spread of W and the impact on X across an appropriate
time frame, starting from t = 0 again.
Note the offset in time means that at t = 6.5 the number of X infected computers reduces by
1, so the spread of t = 7 will be slightly smaller than before. Overall the number of X infected
computers will go up on the hour, and down on the half hour.
(c) Graph the two ses against each other, clearly indicating on it where N = 0.
(d) Assume that at time t = 9, X evolves to spread to three uninfected computers each hour. What
subsequently happens?
6. Briefly describe, in your own words, each of the following. Be sure to specify the domain and nature
of each.
(a) An XML bomb.
(b) BlueSmack.
(c) Mydoom.
(d) Torpig.
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