Signal-to-Noise Ratio - Purposes of Multiplexing and Demultiplexing - IT Assessment Answer

IT Assessment Task

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

1) Explain the purposes of multiplexing and demultiplexing (in physical layer)?

2) Place one of “circuit-switching” and “packet-switching” into the followings sentences

 •can further be divided into two subcategories – virtual-circuit approach and datagram approach.

•takes places at the physical layer.

• In the resources need to be reserved during the setup phases.

 3) 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.

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?

2) In the following network, two hosts Alice and Bob are connected by three links and two routers. There are two addresses (N: IP address and L: Link layer address) for each interface of hosts and routers. Host Alice sends a datagram to host Bob. The datagram passes through the routers and links to host Bob. Before sending, Alice makes a frame from the datagram, then sends to the router-R1.

Explain how host Alice encapsulates the frame from the datagram, and then explain how Router-R1 and Router-R2 prepare and forward those frames on link-2 and link-3 towards host Bob. Mention how Alice gets R1’s link layer address, how routers get next destination and link layer addresses in your explanation

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