PRINCIPLES OF COMPUTER NETWORKS COMP 3203 TEST 1

Principles of Computer Networks. Evangelos Kranakis, Carleton University, SCS 2

1 [10 pts]

Answer the following questions in concise manner (2 pts per question).

1. What are four important factors that led to the development of computer networks?

2. The lowest frequency of a signal is 20 MHz and the highest 60 MHz. What is the

bandwidth?

3. What is the bandwidth of a periodic signal decomposed into eight sine waves having

frequencies 5; 10; 15; 20; 25; 30; 35; 40, respectively?

4. What is the redundancy of the 2 dimensional parity check algorithm on n × n bit

words? Give the formula!

5. What is the duration of 100 bits in seconds of a signal with bit-rate 500 KBps?

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Principles of Computer Networks. Evangelos Kranakis, Carleton University, SCS 3

2 [4 pts]

1. Given the delay and bandwidth of a pipe, what metric can define the capacity (of

the pipe)?

2. A transcontinental channel has one way latency of 50 ms and bandwidth 45 Mbps.

What is the maximum number of bits that can be in transit in this channel? (Put

another way, how many bits can the channel hold?)