Answer these hard questions!

1.Determine the main function of the Network Interface cards.

2.Give the smallest unit given a transmission path, virtual path and virtual circuit with reference to the ATM.

3.Describe the number of layers that are present in the OSI reference model.

4.Give a description of the number of layers that are present in the TCP/IP reference model.

5.Define the term that is the equivalent of IEEE 802.8.

6.Describe the device that is used to provide a central connection point for the cables.

7.In the assumption that each sample requires 8 bits, a sample of the signal must be done at twice the highest frequency which is the equivalent of 2 samples per hertz. Determine the required bit rate in a digitized voice channel which is made by digitizing a 4-KHz bandwidth analog voice signal.

8.Determine the bandwidth of a periodic signal that is to be decomposed into 5 sine waves each having 700, 300, 100, 500 and 900 Hz.

9.Determine the rate of bit given a high definition TV (HDTV).

10.Having the assumption that the rate of downloading pages is a hundred pages per second, determine the required bit rate of the channel.