Draw the waveform for an asynchronous transmission, Computer Network Security

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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.

751_Draw the waveform for an asynchronous transmission.png

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.


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