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1. | Which of the following ATM Adaptation layers would you choose if you were running LANE?
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2. | Which ATM protocol allows Ethernet network traffic to flow through as ATM?
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3. | Token Ring networks choose one device to be an active monitor. Of the following choices, which are performed by the active monitor? (Choose all that apply.)
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4. | Which layer of the OSI reference model do bridges work at?
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5. | If your customer needs to transfer voice and video, which require high network bandwidth, on what network design area should you focus your efforts?
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6. | What is the Network layer of the OSI reference model responsible for?
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7. | Match the datagram type to the layer of the OSI reference model where it is used. (Choose all that apply.)
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8. | Which of the following pairs are Presentation layer standards? (Choose three.)
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9. | Which of the following are Session layer standards?
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10. | When a Token Ring device needs to transmit data, what must it first do?
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11. | Which three of the following are true statements about connection- oriented sessions? (Choose all that apply.)
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12. | CPE is an acronym for which of the following?
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13. | CSU/DSU is an acronym for which of the following?
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14. | Which of the following devices blocks broadcasts by default?
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15. | Which of the following methods can be used to attach FDDI devices? (Choose all that apply.)
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16. | Match the IEEE 802.3 protocol type to its corresponding physical medium. (Choose all that apply.)
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17. | What are the advantages of using fiber rather than copper as a network medium? (Choose all that apply.)
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18. | What type of media access is used by Ethernet?
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19. | What type of media access is used by SDLC?
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20. | Which type of simultaneous transmissions are supported by ISDN networks? (Choose all that apply.)
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Answers
1. | D AAL5 is the ATM Adaptation layer used when running Ethernet on ATM or LANE. |
2. | D LANE (LAN Emulation) is the protocol used for Ethernet on ATM. |
3. | A, C, D The active monitor is responsible for removing loose tokens sent by failed stations and issuing new tokens. The active monitor is also responsible for ring timing. |
4. | D Bridges are devices that operate at the Data Link layer. They forward frames between segments based on station MAC addresses. |
5. | A Different types of media—coaxial cable, twisted pair, and fiber— support different transfer rates. |
6. | C The Network layer performs routing based on logical addressing and uses a best-path route determination for all packets. |
7. | D, E, F, G PDUs at the Transport, Network, Data Link, and Physical layers are also known by the type of datagram unique to each layer. Most other layers simply refer to the PDU type as datagrams. |
8. | A, B, C Presentation layer standards are responsible for conversion, formatting, and encapsulation. |
9. | B The Session layer includes standards used when two stations create a session and exchange data of a common file system. |
10. | B Preventing data collisions, Token Ring networks use tokens to ensure that only one station is allowed to transmit while all other stations wait. |
11. | A, C, D At the Transport layer, segments are acknowledged and sequenced into their proper order. Data flow is also a function of the Transport layer that is used to avoid congestion and data loss. |
12. | D Customer premises equipment (CPE) includes LAN devices, a router, and usually a CSU/DSU. |
13. | B A CSU/DSU is included in CPE and is responsible for timing, and channel multiplexing and demultiplexing. |
14. | D Routers work at the Network layer and prevent broadcasts from traveling across the network by creating broadcast domains. |
15. | A, C, D SASs, DASs, and concentrators are FDDI devices used in FDDI networks to allow for single or multiple connection points. |
16. | A, B, D The IEEE 802.3 protocol type defines many physical medium types. 10Base2 designates a 10Mbps baseband cable, with a limit of 200 meters. |
17. | A, D, E Fiber medium is the most expensive medium type, but it provides many advantages over coax or twisted-pair cabling and can support much greater speeds. |
18. | E Contention is another description for CSMA/CD. All stations contend for access to the media, and data collisions often occur. |
19. | C SDLC uses polling to determine which stations need to transmit to help prevent data collisions. |
20. | A, C, D ISDN networks were developed by the phone companies to support simultaneous transmission of voice, video, and data using analog phone lines with digital signaling. |
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