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Question:
(a) Draw the waveform for an asynchronous transmission with the following specifications:
Character "H", one even parity bit, one start bit, one stop bit, and a baud rate of 4800. Assuming the transmission begins at time t = 0, label the starting/ending time for each bit in the transmission.
Note: ASCII value of "H" is 72
(b) Identify the usage of each of the fields of an IEEE 802.3 data frame.
(c) (i) Give 4 main techniques that a firewall would use to filter incoming and outgoing network traffic.
(ii) Discuss both cut-through and store-N-forward switches. Explain their differences and incorporate the advantages and disadvantages of each.
(d) Explain the purpose of the ident and offset fields in an IPv4 packet header.
Problem (a) Using Vigenère cipher and given the key abc, find the ciphertext for the message: simplicity Only the 26 lower-case alphabetical characters are used in messa
Question: a) Name a method to allow a person to send a confidential email to another person, without risks of a third-party reading the email. Describe briefly the operations
attacks on crytography
CRC can detect the following errors better than check sums. a) Vertical errors b) Burst errors a) VERTICAL ERRORS: This kind of error happens due to a hardware fai
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Problem 1 Solve the following Caesar cipher by showing your working: EM KIUM EM AIE EM KWVYCMZML Problem 2 Compare and contrast between block and stream ciphers, listin
LOCALITY OF REFERENCE PRINCIPLE: Principle of "Locality of Reference" use to predict computer interaction patterns. There are two patterns shown as follows: a) Spatial loca
What is information security Information security protects information (and facilities and systems which store, use and transmit it) from a broad range of threats, in order to p
Develop a TCP-based client-server socket program for transferring a large message. The message transmitted from the client to server is read from a large file (size is about 30000
Question 1: (a) With the help of a diagram show the basic structure of a computer system. (b) Explain as fully as you can each of the parts mentioned above. (c) What are
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