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Question:
a) How many bits per second can be sent on a noiseless 4 MHz channel if four-level digital signals are used?
b) If a binary signal is sent over a 3 KHz channel whose SNR is 30 dB, what is the maximum achievable data rate?
c) A modem constellation diagram has data points at the following coordinates: (1,1), (1,-1), (-1,1) and (-1,-1). How many bits per second can a modem with such parameters achieve at 2400 baud?
d)
i) Using an example, explain how CRC is used for error control.
ii) A 50 Km long cable runs at the T1 data rate (1.544 Mbps). The propagation speed in the cable is 200 m/µs. How many bits fit in the cable?
e) Sketch the differential Manchester encoding for the following bit stream: 0011101
The Security Systems Development Life Cycle (SecSDLC) The same phases which is used in traditional SDLC can be adapted to support specialized implementation of IS project,At its
Problem a) Consider a 1000 Mbps Ethernet with a single Store-N-Forward switch mid-way in the path between two nodes A and B. Assume that there are no other nodes on the network
(a) What are the different architectures for wireless networks? (b) Explain how WEP authentication and encryption works, describe the vulnerability. (c) In what ways are secu
QUESTION : a) A datagram of 3000 bytes has to travel over a network with a MTU size of 1000 bytes. Describe how fragmentation can be used to solve this problem. You should pr
PARITY BIT: A parity bit is an extra bit transmitted with data item select to give the resulting bit odd or even parity. For example an even parity data packet 10100001 has p
Question : (a) How does a 2-key rollover differ from the N-key rollover? (b) Why is isolation so important in interfacing? (c) Explain what is software debouncing.
on LAN,where are IP datagrams transported?
QUESTION (a) (i) Describe Phishing attacks. (ii) Distinguish between Phishing and Spear Phishing attacks. (b) Describe two instances where an attacker sniffing on a netwo
Question 1 a) What is a NMS? Question 2 Explain about Structure of Management Information Question 3 A)In which UDP port number does a protocol entity receive message?
The Role of the Investigation The first phase, investigation is the most significant. What problem is the system being developed to solve? During investigation phase, objectives
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