Dr. Gihan NAGUIB

1

King Saud University

College of Computer and Information Sciences

Department of Information Technology

CAP240 Second semester 1430/1431

Sheet 10 (Chapter 13)

Multiple-Choice Questions

1. If an Ethernet destination address is 07-01-02-03-04-05, then this is a ________

address.

a. Unicast

b. Multicast.

c. Broadcast

d. Any of the above

2. If an Ethernet destination address is 08-07-06-05-44-33, then this is a

________________ address.

a. Unicast

b. Multicast.

c. Broadcast

d. Any of the above

3. Which of the following could not be an Ethernet source address?

a. 8A-7B-6C-DE-l0-00

b. EE.AA-C1-23-45-32

c. 46-56-21-1A-DE-F4

d. 8B-32-21-21-4D-34

4. Which of the following could not be an Ethernet unicast destination?

a. 43-7B-6C-DE-l0-00

b. 44-AA-Cl-23-45-32

c. 46-56-21-1A-DE-F4

d. 48-32-21-21-4D-34

5. Which of the following could not be an Ethernet multicast destination?

a. B7-7B-6C-DE-10-00

b. 7B-AA-C1-23-45-32

c. 7C-56-21-1A-DE-F4

d. 83-32-21-21-4D-34

6. A 10-station Ethernet LAN uses a _______-port bridge if the effective average date

rate for each station is 2 Mbps.

a. 1

b. 2

c. 5

d. l0

Dr. Gihan NAGUIB

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7. A ___-station Ethernet LAN uses a four-port bridge. Each station has an

effective average data rate of 1.25 Mbps.

a. 32

b. 40

c. 80

d. 160

8. Forty stations are on an Ethernet LAN. A 10-port bridge segments the LAN. What

is the effective average data rate of each station?

a. 1.0 Mbps

b. 2.0 Mbps

c. 2.5 Mbps

d. 5.0 Mbps

9. A80-station traditional Ethernet is divided into four collision domains. This means

that a maximum of ________ stations contend for medium access at any one time.

a.320

b. 80

c. 76

d.20

Dr. Gihan NAGUIB

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Exercises

10. How does the Ethernet address 1A:2B:3C:4D:5E:6F appear on the line in binary?

11. The address 43:7B:6C:DE:10:00 has been shown as the source address in an

Ethernet frame. The receiver has discarded the frame. Why?

12. An Ethernet MAC sublayer receives 42 bytes of data from the upper layer. How

many bytes of padding must be added to the data?

13. An Ethernet MAC sublayer receives 1510 bytes of data from the upper layer. Can

the data be encapsulated in one frame? If not, how many frames need to be sent?

What is the size of the data in each frame?

14. Suppose the length of a l0Base5 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 are 10 µs delay in

the equipment.

15. The data rate of l0Base5 is 10 Mbps. How long does it take to create the smallest

frame? Show your calculation.

16. In a CDMA/CD network with a data rate of 10Mbps, the maximum distance

between any station pair is found to be 2500m for the correct operation of the

collision detection process. What should be the maximum distance if we increase

the data rate to

a) 100 Mbps for the same minimum frame size?

b) 1 Gbps for the same minimum frame size?

17. Complete the following Table

Table of Exercise 17

Characteristics 10Base5 10Base2 10Base-T 10Base-FL

Type of cable

Type of transceiver

Need for cable end