Question

P13-1. What is the hexadecimal equivalent of the following Ethernet address?

01011010 00010001 01010101 00011000 10101010 00001111

P13-6. Suppose the length of a 10Base5 cable is 2500 m. If the speed of propagation in a thick coaxial cable is 200,000,000 m/s, how long does it take for a bit to travel from the beginning to the end of the network? Assume there is a 10 μs delay in the equipment

P13-7. Suppose you are to design a LAN for a company that has 100 employees, each given a desktop computer attached to the LAN. What should be the data rate of the LAN if the typical use of the LAN is shown below:

a. Each employee needs to retrieve a file of average size of 10 megabytes in a

second. An employee may do this on average 10 times during the eight-

hour working time.

b. Each employee needs to access the Internet at 250 Kbps. This can happen

for 10 employees simultaneously.

c. Each employee may receive 10 e-mails per hour with an average size of 100 kilobytes. Half of the employees may receive e-mails simultane-

P13-8. In a Standard Ethernet LAN, the average size of a frame is 1000 bytes. If a noise of 2 ms occurs on the LAN, how many frames are destroyed?

Answer 1