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1. What are the two types of firewalls?
2. What is a VPN and why is it needed?
3. How do LANs on a fully private internet communicate?
4. Host A and host B use IPSec in the transport mode. Can we say that the two hosts need to create a virtual connection-oriented service between them? Explain.
compute the money saved in one month by using CFL (compact fluorescent light) bulb (18 W) instead of using an incandescent lamp (60 W) if the cost of electricity is $.12 per kWh. Assume lights are used for 10 hours a day. (30 days in the month)
What are the required pulse train frequencies and corresponding rotational speeds of each stepping motor to drive the table at 275 mm/min in a straight Line from point (x = 0,y = 0) to point (x = 130mm, y = 220mm)?
Water is sprayed into air at 80°F and 14.3 psia, and the falling water droplets are collected in a container on the floor. Determine the mass and mole fractions of air dissolved in the water
For the second object, at a location corresponding to the point of measurement on the first object, determine the vapor concentration and partial pressure. If the average heat flux q" is 2000 W/m2 for the first object determine the average mass fl..
Design a keyboard which plays any note on a single octave. The user interface will consist of eight slide switches and a breadboard speaker circuit - Display the note being played as a character on the left-most seven-segment display. Display the ..
A voltage source v(t)=t*sin(t) is connected to a capacitor with C= 2 farad. Find the energy stored in the capacitor from t=0 to t=1 second.
The NF (dB) is defined as 10log(SNRin/SNRout) - in the unit of dB. If we are given the values of SNRin and SNRout in dB unit, how do we calculate NF (dB) in terms of dB, and how do we calculate NF in term of a pure ratio
Consider people who receive an annual radon exposure (EEC basis) of 0.11 MBq h m-3 for the first 30 years of their lives. At age 30, through radon reduction remediation actions, they decrease their annual exposure to 0.02 MBq h m-3 for the remaind..
Suppose we have a sensor, with a Thévenin resistance that varies from zero to 10kΩ, connected to the input of an amplifier. We want the output voltage of the amplifier to vary by less than 2 percent with changes in the Thévenin resistance of the ..
During each revolution of the cam, a follower rises and falls 20 mm. During each follower up-stroke, the follower resists a constant force of 500 N. During the downstrokes, the force is negligible. The inertia of the rotating parts (including a sm..
Assume we have an N-bus power system and we know the N x N zero-sequence, positive-sequence, and negative sequence matrices for the system. Write a MATLAB program to find the system bus voltages during a (a) 3-phase balanced short circuit fault at..
Discuss linearity, time-invariance and causality of the following systems
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