Comp277 Assignment 1 Fall 2011 Due 20 th December 2011 at 11:00am

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Joanna Freeman
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1 Question 1 1. Which of the following are related to two crucial tasks of a network interface cards? a. Establishes and manages the computer s network connection b. Connect the different parts of a motherboard c. Translates digital computer data into signals (appropriate for the networking medium) for outgoing messages, and translates signals into digital computer data for incoming messages 2. The transmission between the different network components is done through a. A set of parallel lines. b. A set of serial lines. c. A set of mixed lines 3. The transmission through a set of parallel lines is a. A fast transmission. b. A slow transmission. c. A medium transmission 4. The transmission through a set of serial is a. A fast transmission. b. A slow transmission. c. A medium transmission 5. The network card must deal with two kinds of speeds (fast and slow). Therefore, it should: a. Deal with these two kinds of speeds and provide a balance between them. b. Ignore the elements working under a slow speed. c. Prioritize the elements working under a fast speed. 6. The network card must deal with two kinds of speeds (fast and slow). For that purpose: a. The network card stores the data into a ROM (read only memory).

2 b. The network card stores the data into a temporary memory that is a buffer. c. The network card stores the data into a PROM (Programmable ROM). 7. The number of nodes on a network and the length of cable used : a. Strength the transmitted signal. b. Improve the transmitted signal quality c. Influence the quality of communication on the network. It attenuates the transmitted signal. 8. Which of the following best describes the roles of the repeater? a. Clean and regenerate the digital transmission in the process b. Work against attenuation by repeating signals that they receive on a network c. Divide the transmitted signal. 9. Network segmentation using repeaters a. Is Possible b. Is not possible. c. Depends on the repeater type. 10. Which of the following best describes a hub? a. A monoport repeater b. A repeater c. A multiport repeater.

3 Question 2 1. Which of the following best describes a transmission media? a. It is the physical path between transmitter and a receiver. b. It is the logical path between transmitter and a receiver. c. It is the logical path between sender and receiver. d. other 2. Which of the following best describes guided media? a. Waves are guided along a soft medium path. b. Waves are guided along a solid medium path (twisted pair, coaxial cable, and optical fiber). c. waves are propagated through the atmosphere and inner/outer space d. other 3. Which of the following best describes unguided media? a. Use high frequency radio signals or infrared light beams to communicate between the workstations and the server b. Use low frequency radio signals or light beams to communicate between the workstations and the server. c. Use medium frequency TV signals or sound beams to communicate between the workstations and the server. d. other 4. Which of the following best describes unguided media? a. Waves are guided along a soft medium path. b. Waves are guided along a solid medium path (twisted pair, coaxial cable, and optical fiber). c. waves are propagated through the atmosphere and inner/outer space d. other 5. What gives higher bandwidth? a. Lower data rate. b. Higher data rate.

4 c. Less services. 6. What are the influences of transmission impairments such as attenuation? a. Increase the bandwidth. b. Increase the distance. c. Limit the distance. 7. What are the influences of overlapping frequency bands? a. Can amplify the signal. b. Can distort the signal. c. Can improve the signal. 8. Which of the following needs transceiver/antenna to send and receive data a. Guided media. b. Unguided media. c. Passive media. 9. Which of the following has poor security? a. Guided media. b. Unguided media. c. Passive media. 10. Which of the following is susceptible to electrical interference from lights and radios? a. Unguided media. b. Guided media. c. Passive media. 11. Which of the following is expensive? a. Unguided media.

5 b. Guided media. c. Passive media. 12. Which of the following best describes an antenna? a. Unguided media. b. Mechanical conductors used to radiate or collect electromagnetic energy. c. Electrical conductors used to radiate or collect electromagnetic energy. 13. Which of the following best describes a communication satellite? a. a microwave relay station. b. An ordinary station. c. An electric station. 14. Which of the following best define the using purpose of a communication satellite? a. to separate two or more stations. b. to link two or more ground stations c. to link two or more computers. 15. Which of the following best describes a communication satellite task? a. Decreases the signal. b. Attenuates the signal. c. receives on one frequency, amplifies or repeats signal and transmits on another frequency 16. Which of the following best describes the possibility of expanding a network? a. Networks can be expanded by simple adding more servers or cabling. b. Networks can be expanded by adding connectivity

6 devices. c. Networks can be expanded by extracting connectivity devices. 17. Which of the following best describes the roles of network devices? a. Expand or connect networks. b. Can control the amount of traffic on a network. c. Can speed up the flow of data over a network. 18. Which of the following best describes the term creating larger networks? a. Physically expand the network and segment network to filter traffic b. Extend network to connect separate LANs c. Connect two separate computer environments 19. The data transmission between the central unit and the different computer internal components is done through a. A set of parallel lines (also called buses). b. A set of serial lines. c. A set of mixed lines 20. Which of the following best describes a hub? a. Can be used to create multiple levels of hierarchy of stations b. Can be used to create a mono level of hierarchy of stations c. Can be used to create ordinary connected stations 21. A multiple levels hierarchy of connected stations: a. Is difficult to maintain and diagnose b. Is easy to maintain and diagnose c. Has not any advantages 22. A hub can be used to connect two networks which should have: a. Different topologies

7 b. Same topologies c. Different or similar topologies 23. A hub which amplifies or repeat signals that pass through them is a. A passive hub b. An active hub c. A neutral hub d. All of the above 24. Hubs are often used in the following topology (topologies): a. Star-wired ring b. An active hub c. Star d. All of the above 25. Hubs are also called: a. Switches b. Buses c. Concentrators 26. Hubs can connect a. different network architectures, such as Token Ring and Ethernet b. only similar network architectures. c. only equal network architectures. 27. Hubs can a. not reduce network traffic. b. reduce network traffic. c. Adjust network traffic. 28. Network segmentation using Hubs a. Is Possible b. Is not possible. c. Depends on the hub type. 29. Hubs can connect networks that require a. different types of frames b. similar types of frames c. any types of frames

8 30. Which of the followings best describe "network segmentation": a. The breaking down of a single slightly populated network segment into bigger segments, or collision domains, populated by fewer nodes b. The breaking down of a single slightly populated network segment into smaller segments, or collision domains, populated by many nodes c. The breaking down of a single heavily populated network segment into smaller segments, or collision domains, populated by fewer nodes 31. When network administrators place too many nodes on the same network segment,which of the followings best describe the consequences? a. This causes the number of collisions to increase b. This causes the number of collisions to decrease c. This causes the number of collisions to be moderated 32. Which of the followings best describe "a network segment": a. A network that is linked with another network b. Part of a network that is combined logically or physically with the rest of the network c. Part of a network that is divided logically or physically from the rest of the network 33. Which of the followings best describe the functions of a bridge? e. Filter traffic between network segments a. Reduce network traffic by keeping local traffic on the local segment b. Amplify signals c. None of the above 34. Which of the followings best describe the functions of a bridge? a. Divide a large network into smaller segment b. Isolate and control the link problems (e.g. congestion) c. Regenerate signal and check Physical Address and forward only to the specified segment

9 Question 3 Let's analyze the following flowchart depicted on Fig. 1 and which is related to bridge forwarding process: 1. Which of the followings best describe the action taken in box "B"? a. Forward frame to the correct LAN b. Forward frame on some LAN which are the nearest to port x. c. Forward frame on all LAN except port x. 2. Which of the followings best describe the action taken in box "C"? a. Forward frame to the correct LAN b. Forward frame on some LAN which are the nearest to port x. c. Count frame discarded. 3. Which of the followings best describe the action taken in box "A"? a. Forward frame on all LAN without exception b. Forward frame on some LAN which are the nearest to port x. c. Forward frame on all LAN except port x.

10 Let's analyze the following scenario depicted on Fig. 2. We propose here is some bridge forwarding tables. Fig. 2: Creation of a bridge-forwarding table Addresses Port A 1 B 1 C 2 D 3 E 4 F 4 Addresses Port A 1 B 1 C 2 D 3 E 3 F 3 Addresses Port A 1 B 1 C 2 D 3 E 3 F 4 Table1 Table 2 Table 3

11 4. Which of the followings best describe bridge-forwarding table? a. Table 1 b. Table 2 c. Table 3 5. In order to determine which addresses are on which segments, which type of addresses learning bridges use? a. Destination MAC addresses b. Source MAC addresses c. IP addresses 6. Translation bridges can connect networks a. with similar architecture b. with particular architecture c. with different architecture 7. Comparing Bridges with repeaters with hubs, we can conclude that: a. Bridges are faster than repeaters and hubs b. Bridges are as fast as repeaters and hubs c. Bridges are slower than repeaters and hubs 8. Comparing Bridges with repeaters with hubs, we can conclude that: a. Bridges are less expensive than repeaters and hubs b. Bridges, repeaters and hubs have equal costs c. Bridges are more expensive than repeaters and hubs 9. In which process, learning bridges build a table of MAC addresses? a. as they receive frames b. as they hear destination hosts c. When data is processed

Media Using Purpose Media Designation They are

12 Question 4 1. Fill in the following table with the appropriate cable designation. Cable Designation 2. Fill in the following table with the appropriate media designations. Media Using Purpose Media Designation They are used for multicast communications, such as radio and television, and paging systems.

13 They are used for unicast communication such as cellular telephones, satellite networks, and wireless LANs. They can be used for short-range communication in a closed area using line-ofsight propagation. 3. Fill in the following table with the appropriate transmission media type (guided, unguided). Media Designation Transmission Media Type Twisted pair, coaxial cable, optical fibre Antennas, terrestrial microwave, satellite microwave, broadcast radio Ground wave, sky wave, line of sight

14 Answer Sheet Student Name Student ID Question 1 a b c d Question 2 a b c d a b c d a b c d Question 3 a b c d

Chapter 4 NETWORK HARDWARE

Chapter 4 NETWORK HARDWARE 1 Network Devices As Organizations grow, so do their networks Growth in number of users Geographical Growth Network Devices : Are products used to expand or connect networks.