SIT202: Computer Networks - Introduction to Data-Link Layer - Computer Science Assessment Answer

TASK SIT202

Question-1
1) What is the (definition of) bit rate?
2) If the number of signal levels is 8, the bandwidth is 3 MHz, and two samples are taken per Hertz, what is the bit rate? 
3) Suppose that the signal-to-noise ratio (SNR) is 6 dB. What is the capacity (in bits per second) if the bandwidth is 3 MHz? 
4) Discuss the difference between the bit rate and the capacity (e.g., answer why they are different?) 

Question-2 SIT202
1) Explain the purposes of multiplexing and demultiplexing (in physical layer)?
2) Place one of “circuit-switching” and “packet-switching” into the followings sentences

1. can further be divided into two subcategories – virtual-circuit approach and datagram approach.
2. takes places at the physical layer.
3. the resources need to be reserved during the setup phases.
4. Suppose that a packet is transmitted from Host A to Host B. The VIC of the packet at Host A is “c”. What is VCI when the packet is arrived at Host B. 

Question-3 SIT202
1) Consider the parity-check code with 4-bit dataword
• What is the length of the codeword?
• How many codewords the code has?
• What is the minimum Hamming distance?
• How many errors can be corrected?

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