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If a packet arrives at host A with B's source address, it could just as easily have been forged by any third host C. If, however, A accepts a TCP connection from B, then during the three-way handshake A sent ISNA to B's address and received an acknowledgment of it. If C is not located so as to be able to eavesdrop on ISNA, then it might seem that C could not have forged B's response. However, the algorithm for choosing ISNA does give other unrelated hosts a fair chance of guessing it. Specifically, A selects ISNA based on a clock value at the time of connection. Request for Comments 793 specifies that this clock value be incremented every 4 μs; common Berkeley implementations once simplified this to incrementing by 250,000 (or 256,000) once per second.
(a) Given this simplified increment-once-per-second implementation, explain how an arbitrary host C could masquerade as B in at least the opening of a TCP connection. You may assume that B does not respond to SYN + ACK packets A is tricked into sending to it.
(b) Assuming real RTTs can be estimated to within 40 ms, about how many tries would you expect it to take to implement the strategy of part (a) with the un simplified "increment every 4 μs" TCP implementation?
Determine the smallest horizontal force P that will cause impending motion. The coefficient of static friction between A and B is µ's = 0.3 , between B and C, µ's = 0.4 and between block C and the ground, m's = 0.35
Analyze the software tools you would use for your investigation and reasons for choosing them. Describe the legal requirements and ethical issues involved.
write a program that reads from the external file input.txt, counts the letters in every word , replaces the word by that number and then writes the numbers to an external file output.txt
Systems Analysis
Write a program to turn LED4 and LED1 ON. LED2 and LED3 must be OFF.
Describe a DBMS and its functions. Name some of the popular DBMS software? You should search the Internet for the updated DBMS technology.
Present to the management a revised compensation and benefit strategy. Your proposal should include a discussion of:
A roofer, having a mass of 70 kg, walks slowly in an upright position down along the surface of a dome that has a radius of curvature of If the coefficient of static friction between his shoes and the dome is μ = 0.7 determine the angle a u t whic..
You have been assigned to design a 8M x 32 bit memory board. You may use only 256K x 8 bit RAM chips with full parallel addressing.a) How many bits are required in the Address Bus of the whole board?
1. Topic: Personally Identifiable Information (PII) 2. This assignment has two goals: 1) have students increase their understanding of the concept of Protecting Personal Information (PPI) and other ethical issues related to the use of information tec..
Let the d component of x be either 0 or 1. Assume we assign x to w1 if number of non-zero components of x is odd, and to w2 otherwise. Illustrate that this dichotomy is not linearly separable if d>1.
Write a pseudocode statements for my script. I wrote the script but it doesn't work when I copy and paste it into the CLI. I'm supposed to create a batch script file and save it but I'm not sure of how to retrieve it from the CLI because I'm not sur..
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